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Comment:
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Deletions are marked like this. | Additions are marked like this. |
Line 179: | Line 179: |
|| 170 || 2014 Oct. 28|| ||<#ff0000>||Sapphire monolithic suspension||1/300 radian gradient problem must be considered (Since the KAGRA baseline has the 1/300 radian gradient, sapphire mirror must be tilted. The stress in the sapphire fiber must be as small as possible.).|| || | || 170 || 2014 Oct. 28|| ||<#ff0000>In fact, length difference of fiber is larger issue. In the worst cases (according to Kazuhiro’s measurement; http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3129), the difference could be about 1 mm. In such a case, shim is necessary.||Sapphire monolithic suspension||1/300 radian gradient problem must be considered (Since the KAGRA baseline has the 1/300 radian gradient, sapphire mirror must be tilted. The stress in the sapphire fiber must be as small as possible.).|| || |
Line 217: | Line 217: |
|| 208 || 2015 Jun. 2|| ||<#ff0000> ||Vertical spring ||Vacuum chamber for BRT : Since there is no drawing, the cylinder whose diameter is 1.2m and height is 2m will be written in design drawings. || || |
|| 208 || 2015 Jun. 2|| ||Closed. Takahiro shows result; he assumed that length is 250mm, thickness is 2mm, width is 40mm. In this case, appropriate load is 9.73kg weight. Since payload is 120kg in weight, we need 12 blades.->(#214) ||Vertical spring ||In order to make platform smaller, Takahiro ask Takanori how to design GAS filter. Rahul simulates the smaller (but similar) GAS filter. || || || 209 || 2015 Jun. 2|| ||<#ff0000> ||Overall design ||Rahul investigates new ideas as follow;(1)We would like to reduce of weight Recoil mass of marionetta (40kg->20kg).(2)Recoil mass of intermediate mass (In current design, there is no such mass.)(3)Rigid connection between recoil mass of marionette and that of intermediate mass (as below photo)(4)Rigid connection between marionette and intermediate mass. || || || 210 || 2015 Jun. 2|| ||<#ff0000> ||Overall design||We must also consider cables of sensors. || || || 211 || 2015 Jun. 9|| ||<#ff0000> ||Sapphire monolithic suspension||In order to check how Q-values depend on the surface, Kazuhiro later will send the IMPEX monolithic fiber to Takayama-san(National Institute for Fusion Science). || || || 212 || 2015 Jun. 9||K. Yamamoto ||<#ff0000> ||Material||Kazuhiro proceeds with the procurement of low magnetism stainless steel. He will ask whether the increase of magnetism by processing can be reduced by heat treatment. || || || 213 || 2015 Jun. 16|| ||<#ff0000> ||Overall design ||Since it is not easy to carry something along Y arm, maybe we carry from Mozumi entrance. In this case, some cranes or something similar are necessary at Mozumi entrance (Truck from outside cannot enter the KAGRA site !) || || || 214 || 2015 Jun. 16|| ||<#ff0000> ||Vertical spring ||Hagiwara-san checks whether these 12 blade springs (simulated by Takahiro (#)208) can be installed in platform or not. || || || 215 || 2015 Jun. 16|| ||<#ff0000> ||Vertical spring ||Takahiro upload memo about how to design blade spring in GAS (in short what Takanori taught) on KEK wiki. || || || 216 || 2015 Jul. 8|| ||<#ff0000> ||Sapphire monolithic suspension ||Jig for ears on mirror during Hydroxide Catalysis Bonding process. The adjustment along direction which is perpendicular to optical axis is difficult. The end of flat cut is not good reference. Moreover, how to put mark (and remove later) is not an easy issue. Hiroki and Kazuhiro are considering. || || || 217 || 2015 Jul. 8|| ||<#ff0000> ||Sapphire monolithic suspension ||Final version of design drawing of end sapphire mirror will be uploaded on KEK wiki.|| || || 218 || 2015 Jul. 31|| ||<#ff0000> ||Overall design ||The acceptable delay of bKAGRA should be considered and discussed.|| || || 219 || 2015 Jul. 31||T. Tomaru ||<#ff0000> ||Sapphire monolithic suspension ||3 dimension measurement system is necessary to check position of ear after bonding. Takayuki proposed table top one (CMM) and looks for it.|| || || 220 || 2015 Jul. 31||A. Hagiwara ||<#ff0000> ||Overall design ||Hagiwara-san introduced new CAD drawing of Type A to vacuum chamber. She thinks that check by VIS is necessary. As first step, her drawing is uploaded in dropbox.|| || || 221 || 2015 Jul. 31|| ||<#ff0000> ||Overall design ||We observed motion of first floor. So, we must check motion of the second floor. The results of survey on the first and second floors must be connected (via slope or stairs ?). Round connection is better. In any cases, VIS and CRY must consider carefully (not only survey but also installation). || || || 222 || 2015 Jul. 31||Y. Aso ||<#ff0000> ||Overall design ||The largest concern of survey is lack of human resource. Outsourcing could be a solution (budget is an issue). Yoichi tells this issue to SEO. || || || 223 || 2015 Jul. 31|| ||<#ff0000> ||Overall design ||We must summarize what we must survey (change of whole tunnel should be measured). || || || 224 || 2015 Jul. 31|| ||<#ff0000> ||Overall design ||Requirements and specifications (length, collimation, and so on) of short optical lever for cryo payload should be summarized. || || || 225 || 2015 Aug. 4|| ||<#ff0000> ||Overall design ||Bending length of metal fiber should be checked || || || 226 || 2015 Aug. 4||E. Majorana, K. Yamamoto ||<#ff0000> ||Overall design ||We measure vibration of radiation shield at KAGRA site (X end, probably, June or July 2016). Ettore said that KAGRA can use Luca’s vertical accelerometer and Luca is interested (He can measure). However, Ettore and Kazuhiro found that sensitivity improvement is necessary (Meas. Sci. Technol. 25 (2014) 015103). Ettore checks noise at cryogenic temperature (electric noise is dominated by thermal noise) and performance at Sardinian mine. Ettore also pointed out that the sensitivity is larger when we increase pump current (in the measurement at Toshiba, this current is as small as possible because they are afraid that current can generate heat). We keep touch and exchange information before we start measurement. || || || 227 || 2015 Aug. 4||K. Yamamoto ||<#ff0000> ||Overall design ||We measure vibration of radiation shield at KAGRA site (X end, probably, June or July 2016). Kazuhiro will ask Tatsumi-san the status (He has Dan’s horizontal accelerometer now). || || || 228 || 2015 Aug. 11|| ||<#ff0000> ||Sapphire monolithic suspension ||We must decide the distance edges of mirror itself and reflective coating. || || || 229 || 2015 Aug. 11|| ||<#ff0000> ||Overall design ||Ettore proposed particle counter is put in clean booth when somebodies work. It gives much information. || || || 230 || 2015 Aug. 18|| ||<#ff0000> ||Overall design || We must take care of weight of screws. || || || 231 || 2015 Sep. 8|| ||<#ff0000> ||Overall design || Preparation of Slow DAQ test at KAGRA site in iKAGRA. CRY intends to check whether DAQ and some thermometers work and joins the preparation of Yoichi and Kazuhiro (H) et al. on next month. CRY must summarize connectors by this preparation. Cables (about 20m length, where they are put (along wall, ceiling, …), ) must be taken care of. || || || 232 || 2015 Sep. 8||T. Tomaru ||<#ff0000> ||Overall design || Takayuki asks Osamu to correct schematic view of Slow DAQ later. || || || 233 || 2015 Sep. 8|| ||<#ff0000> ||Overall design || We can check output of thermometer in cryostats via ICRR VPN. We must investigate how to access from KEK. || || || 234 || 2015 Sep. 8|| AOS ||<#ff0000> ||Overall design || Torisha will deliver two cryo ducts (for end cryostat on the Beam Reducing Telescope side). The first one will arrive on March and the next one will on April or May. So, the first and second one can be test on middle of February and March (or April), respectively (Inhomogeneous SolBlack could be an issue). AOS consider what point must be checked. || || || 235 || 2015 Sep. 8|| AOS ||<#ff0000> ||Overall design || AOS checks black coating on low magnetism stainless steel (NSSC-130S from Nippon Steel and Sumitomo Metal). || || || 236 || 2015 Sep. 8||T. Miyamoto ||<#ff0000> ||Overall design || Hagiwara-san revised clamp. But so far, bending length of metal wires is not taken into account. Kazuhiro (Y)’s rough evaluation suggest that it could be several mm. Takahiro will check. || || || 237 || 2015 Sep. 8||T. Tomaru ||<#ff0000> ||Overall design || In order to reduce weight, the Marionetta looks delicate. So, Takayuki checks how much the first resonant frequency is. || || || 238 || 2015 Sep. 8||A. Hagiwara, T. Tomaru ||<#ff0000> ||Overall design || Rahul proposed heavier intermediate mass (to reduce recoil loss). The platform weight could be 60 kg weight. If so, intermediate mass can be heavier. Takayuki and Higiwara-san will check later. || || || 239 || 2015 Sep. 8|| ||Closed. It is OK if we can adjust the weight of mass within 10% of weight of mass itself (In usual case, about 20kg. So, small masses for adjustment is about 2kg in total.) ||Overall design || We discuss the small weight for adjustment of weight of each mass. We must consult with VIS. || || || 240 || 2015 Sep. 8|| ||<#ff0000> ||Sapphire monolithic suspension || Takayuki mentioned that heat extraction test for ACTUAL KAGRA sapphire suspension (otherwise, we cannot know how much mirror temperature is). But it is not easy … We must consider. || || || 241 || 2015 Sep. 15|| ||<#ff0000> ||Overall design || Sensor and actuator for vertical (and pitch) motion of intermediate mass is considered. || || || 242 || 2015 Sep. 15|| ||<#ff0000> ||Overall design || VIS discusses whether (or when) they send their drivers and so on to CRY. Ryutaro sends information of details later. || || || 243 || 2015 Oct. 14|| ||<#ff0000> ||Sapphire monolithic suspension || We must measure thickness of indium (between nail head and blade spring, and between nail head and sapphire hook (ear). || || || 244 || 2015 Oct. 14|| ||<#ff0000> ||Sapphire monolithic suspension || Oil in micrometers can be an issue (source of contamination (information from VIS)). We must wash or look for vacuum compatible ones. || || || 245 || 2015 Oct. 14|| ||<#ff0000> ||Sapphire monolithic suspension || Auto collimator must be taken into account. || || || 246 || 2015 Nov. 11||R. Kumar ||<#ff0000> ||Sapphire monolithic suspension || Rahul prepares design drawing of jack. || || || 247 || 2015 Dec. 15|| ||<#ff0000> ||Sapphire monolithic suspension || Investigation of water glass between sapphire blade spring and nail head || || || 248 || 2015 Dec. 24||K. Yamamoto ||<#ff0000> ||Sapphire monolithic suspension || Takayuki asked whether we can use clean booth (class 1000) in Advanced measurement experiment building of KEK. Yes, we can. Kazuhiro considers how much area is necessary. || || || 249 || 2015 Dec. 24||K. Yamamoto ||Closed. http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4914 ||Sapphire monolithic suspension || Four sapphire ears from IMPEX will be delivered tomorrow. Kazuhiro proposed that we ask Ueda-san and Enami-san to measure flatness and geometrical shape and that we provide jig to fix ears for measurement. || || || 250 || 2016 Jan. 13||K. Yamamoto ||Closed. ->#259 ||Sapphire monolithic suspension || The extra pieces of sapphire fibers must be necessary (risks of breaks) and the budget must be considered. || || || 251 || 2016 Jan. 13|| ||<#ff0000> ||Sapphire monolithic suspension || CRY will ask MIR to measure geometrical shape of sapphire mirror and flatness of flat cut on barrel surface. || || || 252 || 2016 Jan. 13|| ||<#ff0000> ||Control || Life time (or change of efficiency) of PD and LED must be taken care of. || || || 253 || 2016 Jan. 19||R. Kumar ||<#ff0000> ||Sapphire monolithic suspension || Rahul summarizes the list of needed item and quotation about sapphire fiber holder || || || 254 || 2016 Jan. 19||T. Tomaru ||<#ff0000> ||Control || Takayuki asks Ryutaro, Yoichi, Osamu, Taknori whether CRY can use digital system of VIS. || || || 255 || 2016 Feb. 2|| ||<#ff0000> ||Overall design || Takayuki asks Ryutaro, Yoichi, Osamu, Taknori whether CRY can use digital system of VIS. || || || 256 || 2016 Feb. 2|| ||<#ff0000> ||Material || We must take care of magnetism of Maraging. Takayuki is afraid that magnetism of Maraging causes issue. Tomotada pointed out Ni coating to avoid rust on Maraging dominates magnetism. Takayuki suggests that Cr coating can be better. || || || 257 || 2016 Mar. 1||K. Yamamoto ||<#ff0000> ||Sapphire monolithic suspension || Takayuki suggested combination of height gauge and dial gauge (350mm length with 0.01mm precision) in order to measure length of sapphire fiber. Kazuhiro checks. || || || 258 || 2016 Mar. 1||K. Yamamoto ||<#ff0000> ||Sapphire monolithic suspension || Kazuhiro must write investigation report to IMPEX carefully as feedback. Result of flatness measurement by IMPEX is not consistent with Ueda-san’s (We can ask third person ?). || || || 259 || 2016 Mar. 1||K. Yamamoto ||He asked quotation for 8 fibers and 16 fibers. Quotation is on KEK wiki: Quotation IMP-160316-3-Bars (sapphi.. in http://wiki.kek.jp/pages/viewpage.action?pageId=37159777 ||Sapphire monolithic suspension || We must purchase extra fibers from IMPEX. Kazuhiro evaluates cost and lead time for discussion. || || || 260 || 2016 Mar. 1||K. Craig and K. Yamamoto ||<#ff0000> ||Sapphire monolithic suspension || Assembly of sapphire parts must be tried as soon as possible. || || || 261 || 2016 Mar. 1||K. Yamamoto ||<#ff0000> ||Sapphire monolithic suspension || Delivery of ETM (ITM) is on December 2016 (March 2017). Kazuhiro must make plan based on this delivery. || || || 262 || 2016 Mar. 8||R. Kumar ||<#ff0000> ||Sapphire monolithic suspension || Rahul is preparing document about assembly of sapphire suspension. || || || 263 || 2016 Mar. 8||R. Kumar ||<#ff0000> ||Control || Rahul is checking papers about AdLIGO control and damping system. || || || 264 || 2016 Apr. 13||K. Yamamoto ||<#ff0000> Kazuhiro visited NAOJ and found some parts must be ordered or he asks mechanical workshop.->Kazuhiro visited Rome on 20th of May. Luca, Ettore and Kazuhiro discussed. They will install accelerometers on autumn at a cryostat in the center room. In this case, measurement is after autumn. However, they prepare everything by end of July.||Overall design || Kazuhiro is charge of measurement of vibration in radiation shield in summer 2016. He contacts Ettore, Luca, and Tatsumi-san to check status of accelerometers. || || || 265 || 2016 Apr. 13||R. Kumar ||<#ff0000> ||Vertical spring || Rahul shows simulation result for vertical spring in platform in the next meeting. || || || 266 || 2016 Apr. 13||K. Yamamoto ||Closed. He did it. ||Sapphire monolithic suspension || Kazuhiro will send information for specification list (flatness, report about flatness measurement) to Shinkosha for procurement in fiscal year 2016. || || || 267 || 2016 Apr. 13||K. Yamamoto ||<#ff0000> IMPEX replied it is difficult to polish bonding surface with such large slits. So we order exactly same one as those in the last fiscal year.||Sapphire monolithic suspension || It is better that slits of sapphire ears is large (about 7mm) for future improvement (thicker fiber can be used). Kazuhiro asks IMPEX quotation for ears with wide slits and whether they can make enhance with of slits in delivered ears. Takayuki asks Shinkosha whether they can make such ears and quotation. || || || 268 || 2016 Apr. 13||K. Yamamoto ||<#ff0000> ||Sapphire monolithic suspension || Kazuhiro will measure vibration in shield of middle size cryocooler at Kashiwa. || || || 269 || 2016 Apr. 19||K. Yamamoto ||Closed. Unfortunately, KEK clean booth introduced by Takayuki (ISO 6 at most) is not enough for bonding. Virgo clean booth is ISO3. LIGO has ISO 1 booth in ISO 2 or 3 booth. ->#271 ||Overall design || We must check cleanness of LIGO and Virgo. || || || 270 || 2016 Apr. 26|| ||Closed. Marielle can stay one week. ||Sapphire monolithic suspension || Kieran and Kazuhiro check whether somebodies who are familiar with Hydroxide Catalysis Bonding in Glasgow can join ear attachment in July. || || || 271 || 2016 Apr. 26|| ||<#ff0000> ||Overall design || We look for clean booth (ISO 1-3) for Hydroxide Catalysis Bonding. || || || 272 || 2016 May 10||T. Tomaru ||<#ff0000> ||Overall design || Clamp for metal wires: Contact point (or area) between wire and mass is an issue. If it is too wide, contact point is not defined sharply and it could imply low Q-values. If it is too narrow, wire could be broken. Takayuki asks Mark details of clamp in AdLIGO. || || || 273 || 2016 May 10||T. Tomaru ||<#ff0000> ||Overall design || Takayuki will check how to fix cables in payload (he asks VIS). || || || 274 || 2016 May 10|| ||<#ff0000> ||Material || Since low magnetism stainless steel is too hard, VIC applied heat treatment before processing of recoil mass. We must check effect of this heat treatment. VIC have plan to heat metal for other customers. Small sample from us can put in furnace at same time. || || || 275 || 2016 Jun.7 || ||<#ff0000> ||Overall design || If somebody has idea of experiment in cooling test of KAGRA cryostat at site, please announce as soon as possible. || || || 276 || 2016 Jun.7 || ||<#ff0000> ||Sapphire monolithic suspension || We must consider how to check whether indium is melted or not carefully. || || || 277 || 2016 Jun.7 ||R. Kumar ||<#ff0000> ||Material || Stress by 1/300 gradient in metal wire must be checked. || || || 278 || 2016 Jun.7 ||K. Craig ||<#ff0000> ||Sapphire monolithic suspension || We might use Romer arm in LIGO to measure 3 dimensional shape. Kieran asks Norna. || || || 279 || 2016 Jun.7 ||K. Yamamoto ||<#ff0000> ||Sapphire monolithic suspension || NAOJ has also clean room. Kazuhiro will ask whether we can use for Hydroxide Catalysis Bonding. || || || 280 || 2016 Jun.7 ||K. Yamamoto ||<#ff0000> ||Sapphire monolithic suspension || Kazuhiro also make list for necessary items for Hydroxide Catalysis Bonding in this week. || || || 281 || 2016 Jun.7 || ||<#ff0000> ||Sapphire monolithic suspension || We must take care of design of fiber installation jig and earthquake stopper (confliction must be avoided). || || || 282 || 2016 Jun.7 || ||<#ff0000> ||Sapphire monolithic suspension || After long discussion for Hydroxide Catalysis Bonding, Takayuki is charge of (discussion with MIR); Jig to lift up mirror, HCB at LMA, 3-dimention measurement tools. || || || 283 || 2016 Jun.7 || ||<#ff0000> ||Sapphire monolithic suspension || We must consider how to wash and rinse flat cut (before or after mirror is installed in box) ? || || || 284 || 2016 Jun.13 || ||<#ff0000> ||Sapphire monolithic suspension || Procedure of the mirror installation into Perugia box. How to rotate mirror in box precisely ? || || || 285 || 2016 Jun.13 || ||<#ff0000> ||Sapphire monolithic suspension || Ear position measurement after bonding is an issue. How to measure in CLEAN CONDITION ? 3 dimension measurement arm at KAGRA site can be useful. || || || 286 || 2016 Jun.13 || ||<#ff0000> Tomotada Akutsu would like to know how to fix window on shield (we must ask Toshiba), tolerance of window (diameter and thickness, Kimura-san checks quotation).||Overall design || Design with tolerance of windows and clamp parts in cryostat for optical levers will be sent to AOS. || || || 287 || 2016 Jun.13 || ||<#ff0000> ||Sapphire monolithic suspension || We must consider reference and monitor system for 1/300 gradient. In the process of assembly this tilt is changed. || || || 288 || 2016 Jun.13 || ||<#ff0000> ||Material || Wire under recoil mass. Because of holes at lower parts of recoil mass, wire has stress ends of hole. || || || 289 || 2016 Jun.13 || ||<#ff0000> ||Sapphire monolithic suspension || Rahul explained strength test of ear-mirror bonding in AdVirgo (He learned at Perugia from Helios) with spring. After one month curing, mirror with ears is put on jig and they wait 10 days. If nothing happens, it is OK (and nothing happened so far). || || || 289 || 2016 Jul.5 || ||<#ff0000> ||Overall design || Kieran (Rahul) leaves Japan on July (October) of 2017. We must consider how to take over. || || || 290 || 2016 Jul.12 || ||<#ff0000> ||Overall design || VIS prepares items to catch dropping something. || || |
Cryopayload's Action Item List
General Descriptions
This is a list of action items identified in the cryopayload meeting after its kick-off (2013 Nov 15). If you want to know the previous information or historical path to the cryopayload meetings, please refer to CRY-AOS meeting.
Action Items
A/I# |
Identified on |
Assigned to |
Status/Output |
Related to |
Description |
Due date |
001 |
2013 Nov. 19 |
Sekiguchi, Hirose |
Closed. Takanori and Osamu Miyakawa found the document about OSEM (it includes the schematic design of circuit) by themselves. |
Control |
Ask somebody in LIGO details of the circuit for OSEM. |
2013 Nov. 26 |
002 |
2013 Nov. 19 |
R. Takahashi |
Closed. Unfortunately, there is not 3 dimensional but only 2 dimensional design drawing.->#016 |
Overall design |
3-D design drawing of Type-A is necessary (ASAP!). Ask to Gianni. |
2013 Nov. 26 |
003 |
2013 Nov. 19 |
R. Takahashi |
Closed. Ryutaro explained. However, further discussion is necessary.->(#011) |
Vertical spring |
About blade metal spring (vertical spring), the schedule and strategy and so on will be summarized by R. Takahashi, Ishizaki, Sekiguchi, and K. Yamamoto, and reported in the next meeting. |
2013 Nov. 26 |
004 |
2013 Nov. 19 |
K. Yamamoto |
Closed. (1)Eric is busy. Moreover, Eric does not use ANSYS or COMSOL. However, Yoichi (or his student) will calculate it using COMSOL (Kazuhiro wrote Yoichi on Microsoft Project).(2)No files remain in Ando lab. |
Material |
About the masses, including a recoil mass, intermediate mass, intermediate recoil mass, and platform, the evaluation of the eddy current damping is necessary. K. Yamamoto will ask (1) to Eric Hennes how much he can make his effort for this problem and whether he can provide files for Finite Element Analysis. (2) to Ando or Aso whether Nishi's file for eddy current damping still remains. |
2013 Nov. 26 |
005 |
2013 Nov. 19 |
D. Chen |
Closed. The Picomotor didn’t work at 77K. But that might be because of the cooling shock. So we will have quick cooling test. |
Control |
D. Chen will ask Uchiyama whether a picomotor can survive at cryogenic temperature. |
2013 Nov. 26 |
006 |
2013 Nov. 19 |
D. Chen |
Closed. He received the design drawing from Takanori. |
Control |
D. Chen looks for design drawing of a stage for Type-B, and some commercial stages. |
2013 Nov. 26 |
007 |
2013 Nov. 19 |
K. Yamamoto |
Closed. Kazuhiro rewrote it. |
Control |
The schedule for the control system should be considered again. |
2013 Nov. 26 |
008 |
2013 Nov. 19 |
K. Yamamoto |
Closed. Dan asked Ryutaro. |
Control |
About the procurement of the OSEMs, K. Yamamoto will consult R. Takahashi. |
2013 Nov. 26 |
009 |
2013 Nov. 19 |
T. Suzuki |
Closed. Saito-san introduced ceramic bearing (and companies, NTN, NSKN). Takayuki Tomaru showed other one (http://www.jaxa.jp/press/nal/20020327_bearing_j.html) (#043). Now they will be order for test (#062) |
Control |
Check whether the thrust bearing can work at the cryogenic temperature. This part is necessary to adjust angle between intermediate mass and its recoil mass. But, it works for initial alignment. Thrust bearing is about 50mm in diameter and load is about 100kg. |
2013 Nov. 26 |
010 |
2013 Nov. 19 |
D. Chen (?) |
Closed. (i)In order to fix LED and PD, circuit board is used. We must check circuit board is OK at low temperature. -> #019(ii)Dan shows 7m cable increases the noise. Long cable can generates oscillation at high frequency region. The length of cables for cryo payload is 20m in length. We must check how much the long (flat) cable generates noise. If it is a problem, satellite boxes in vacuum are necessary. (iii)Window of photo detector will be removed because nitrogen gas is in Photo Diode. |
Control |
About OSEM, (i)check about out gas; (ii)check noises by 10-m long line; (iii)check whether the window of photodiode be removed. |
2013 Nov. 26 |
011 |
2013 Nov. 26 |
T. Sekiguchi |
Closed. Takanori summarized and explained.Vibration via heat link (T. Sekiguchi)->#017 |
Vertical spring |
For the basis of discussion, Takanori will summarize the vibration via heat link until this weekend. After that, he and Ryutaro circulate their ideas about vertical spring and we discuss. |
2013 Dec. 1 |
012 |
2013 Nov. 26 |
K. Yamamoto |
Closed. (#105) |
Vertical spring |
Kazuhiro rewrites schedule. |
2013 Dec. 3 |
013 |
2013 Nov. 26 |
K. Yamamoto |
Closed. He explained. Strategies for sapphire monolithic suspension 2(K. Yamamoto)He also revised schedule. |
Sapphire monolithic suspension |
Kazuhiro will summarize the details of schedule for monolithic sapphire suspension based on above discussion by the next meeting. |
2013 Dec. 3 |
014 |
2013 Nov. 26 |
T. Suzuki and K. Yamamoto |
Closed. Now, members of SEO and EO recognized the issue, but how to fix ? |
Sapphire monolithic suspension |
Suzuki-san and Kazuhiro will report the serious lack of human resources on the next year to SEO and EO. |
2013 Dec. 3 |
015 |
2013 Nov. 26 |
R. Kumar |
Closed. Rahul investigated and explained Sapphire blade spring. Kazuhiro (Hayama) (and Kentaro and Yoichi) gave comments about data analysis (and noise and control). |
Sapphire monolithic suspension |
Rahul investigates how much the lowest frequency of sapphire spring is. After that, we ask it is a problem for observation to Data Analysis group. |
2013 Dec. 10 |
016 |
2013 Dec. 3 |
R. Takahashi, E. Hirose |
Closed. Takanori and Eiichi summarized Preliminary design of Type-A suspension system. Rahul’s new mission ->(#048). |
Overall design |
Type A 3 dimension drawing. Ryutaro gives Eiichi 2 dimensional design drawing and Eiichi makes drawings. |
|
017 |
2013 Dec. 3 |
R. Takahashi, H. Ishizaki, T. Sekiguchi |
Finally, this was ordered. The delivery date is 20th of January in the earliest case. |
Vertical spring |
Design drawing for vertical spring in platform (Ishizaki and Takahashi). Takanori takes care of shape of blade spring. The load on GAS in Type B like is different from that of Ad LIGO like. |
|
018 |
2013 Dec. 3 |
K. Yamamoto |
Closed. He summarized (in Japanese. Cryogenic payload strategy). |
Material |
Kazuhiro summarize requirement of magnetization and so on before the meeting with Sumikin |
2013 Dec. 17 |
019 |
2013 Dec. 3 |
R. Takahashi |
Urgent! |
Control |
Ryutaro will consult Saito-san on the outgas of circuit board for OSEM. |
|
020 |
2013 Dec. 3 |
K. Yamamoto |
Urgent! -> He explained. He will discuss with Sascha. |
Sapphire monolithic suspension |
Kazuhiro summarize the length of sapphire fiber. He must take bending point and adjustment of diameter into account |
17 Dec 2013 |
021 |
2013 Dec. 3 |
K. Yamamoto |
Closed. He summarized in Japanese (13 and 14 pages of payload strategy(in Japanese). Takanori calculated thermal noise of violin modes of heat link. Unfortunately, it is quite high Suspension Thermal Noise of Test Mass Suspension With Metal Wires + Heat Links in English. |
Sapphire monolithic suspension |
Kazuhiro write the report about backup plan. |
17 Dec 2013 |
022 |
2013 Dec. 3 |
D. Chen |
Closed. -> (#040) |
Sapphire monolithic suspension |
He considers structure in the intermediate mass (sapphire blades, stepping motor, stages). Later we discuss. |
17 Dec 2013 |
023 |
2013 Dec. 10 |
S. Zeidler |
Tomotada emphasized that the first priority is to fix the problem of magnetism of black coating. Asahi precision is investigating how to reduce the magnetism of SolBlack. The requirement of magnetism must be clear soon. The design of the recoil mass should be released soon (almost it has already been written). The space for baffle in shield must be taken care of. The suspension for baffle will be design. |
Overall design |
Baffle design : Mirror can observe the frame of hole of radiation shield for laser beam. It is an issue of scattered light. We also consider how to reduce the size of baffle. Other concerns are as follows; whether heat path on baffle is necessary ?, deformation under gravity, in the case of SolBlack … We must consider the structure between baffle and hole for laser beam on radiation shield. -> Simon starts the investigation. |
|
024 |
2013 Dec. 10 |
Y. Aso, E. Hirose |
Urgent! Kazuhiro summarizes points and consults with them. |
Sapphire monolithic suspension |
Yoichi Aso and Eiichi Hirose prepare the plan and R&D items of optical contact and screw, respectively. |
24 Dec 2013 |
025 |
2013 Dec. 10 |
E. Hirose |
Closed. Now this test is for “cradle” sapphire suspension with screws. Yusuke will summarize outline(#060). |
Sapphire monolithic suspension |
Eiichi prepares document describing planned test (100mm diameter sapphire bulk will suspended by sapphire fibers) and contributions. |
24 Dec 2013 |
026 |
2013 Dec. 10 |
D. Chen |
Closed. He asked and we discussed this topic.->(#041,042) |
Sapphire monolithic suspension |
Dan will ask Ryutaro what is pro and con of large intermediate mass. |
17 Dec 2013 |
027 |
2013 Dec. 10 |
T. Suzuki |
Closed. He released Sapphire surface friction. |
Sapphire monolithic suspension |
Suzuki-san has data of friction between sapphire and sapphire and he will circulate later. |
17 Dec 2013 |
028 |
2013 Dec. 10 |
Y. Aso |
Closed. Takanori did(#047). |
Vertical spring |
Yoichi checks vibration transfer function of heat links with extra pendulums and whether weight of mass of these pendulums can be on the order of kg using ANSYS or COMSOL. |
|
029 |
2013 Dec. 10 |
T. Suzuki, S. Koike, C. Tokoku |
Closed. Koike-san prepared Drawing payload and baffle in shield. |
Overall design |
Suzuki-san asks Koike-san to provide design drawing in shield. Tokoku-san learns how to handle it in CAD. |
|
030 |
2013 Dec. 10 |
T. Suzuki, N. Kimura |
In this time, we do not order. Kimura-san expects that small bunch can be ordered. Anyway, we obtained small test pieces. |
Material |
Suzuki-san (or Kimura-san) checks the schedule of procurement of NSSC130S. |
17 Dec. 2013 |
031 |
2013 Dec. 10 |
Y. Sakakibara |
Closed.Sphere was delivered. However, we must consider whether SolBlack is adopted or not.(->#071) |
Material |
Yusuke orders sphere made from SUS 316L and 305M to check how machining is difficult and whether deposition of SolBlack is OK. |
|
032 |
2013 Dec. 10 |
C. Tokoku |
Closed. She found that Cryogenic Research Center in Hongo campus has SQUID. She is preparing paper for submission. We can start the measurement at the beginning of the next year(->#071). Kazuhiro (Yamamoto) add this topic to Microsoft Project. |
Material |
Tokoku-san investigates where we can measure magnetism and asks measurement or measures. |
17 Dec. 2013 |
033 |
2013 Dec. 10 |
T. Suzuki |
Closed. He collected information (KOBELCO and Nippon Steel and Sumitomo Metal). Diameter is between 1 mm and 250 mm. Typical length is 4000mm. |
Material |
Suzuki-san asks companies (for example, http://www.ofa-titanium.com/product/titan/ti64.html) what kinds of geometry of Ti-6Al-4V are possible. |
|
034 |
2013 Dec. 10 |
C. Tokoku, T. Suzuki |
Everything was delivered. |
Material |
Tokoku-san prepares the mockup to research how to install wire between room and cryogenic temperature by end of next week. First of all, she checks where it will be in 101. Duct could be made from plastic. Wire is titan or its alloy. Suzuki-san prepares the stainless wire. |
20 Dec. 2013 |
035 |
2013 Dec. 10 |
K. Yamamoto |
Closed. Kazuhiro consults with Ettore. He summarized. 22-24 pages of Payload strategy (in Japanese).At least, monitor for installation is necessary.->(#087) |
Material |
Monitor system to check whether the wire between room and cryogenic temperature touches the cryoduct. |
|
036 |
2013 Dec. 10 |
T. Suzuki, S. Koike |
Closed. About 1.7 mm near center of shield floor. This point must be taken into account when we design cryo duct above radiation shield. (#061) |
Material |
Suzuki-san checks result of Koike-san’s calculation to evaluate the deformation of radiation shield after evacuation for design of cryoduct on radiation shield top. |
|
037 |
2013 Dec. 10 |
Y. Sakakibara |
Closed. He summarized. Calculation of thermal radiation from SAS hole |
Material |
Yusuke calculate how the radiation into shield depends on the diameter of cryoduct. |
17 Dec. 2013 |
038 |
2013 Dec. 10 |
D. Chen, R. Takahashi, T. Sekiguchi, E. Majorana |
Closed. He summarized result Cryogenic meeting status report on 2013/12/17 (Control). The mass moved by stepping motor is on the order of kg. |
Control |
Dan will consult Takanori, Ryutaro and Ettore (how to evaluate the requirement for stepping motor for Type B or Virgo ? ) |
17 Dec. 2013 |
039 |
2013 Dec. 10 |
T. Suzuki |
Closed. He reported AdhesiveTest. He recommends Nitofix. ->(#044). Othrewise, Araldite rapid. |
Control |
Suzuki-san reports the strength of glue for coil-magnet actuator in the next meeting. |
17 Dec. 2013 |
040 |
2013 Dec. 17 |
R. Kumar, D. Chen |
Closed. Takanori and Eiichi proposed first preliminary design. Preliminary design of Type-A suspension system.-> Rahul’s new mission (#048). |
Sapphire monolithic suspension |
”First design” of intermediate mass: Rahul fixs the details of sapphire blade springs. He will give information to Dan. Dan considers how blade spring and stage of stepping motor will be installed in intermediate mass and he evaluates moment of inertia. |
25 Dec. 2013 |
041 |
2013 Dec. 17 |
S. Koike |
Closed. He considered. Unfortunately, it is complicate. So, we do not investigate. |
Sapphire monolithic suspension |
Koike-san considers whether “cross structure” of sapphire blade spring is possible or not. If necessary, he adjusts the shape of blade spring. But if we need drastic improvement, we forget this idea. |
25 Dec. 2013 |
042 |
2013 Dec. 17 |
R. Kumar, A. Khalaidovski |
Closed. Rahul’s new mission (#048). |
Sapphire monolithic suspension |
Rahul improves the design of blade spring. Sascha will order. |
25 Dec. 2013 |
043 |
2013 Dec. 17 |
K. Yamamoto |
Closed. Kazuhiro summarizes what happened in CLIO and his guess about what happens in KAGRA 16-17 pages of Payload strategy (in Japanese). Vertical drift is an issue (->#086). |
Overall design |
Kazuhiro will ask Takashi Uchiyama how much CLIO suspension rotates during cooling.Kazuhiro Yamamoto summarizes the requirement of dynamic range of mirror position and yaw rotation because the top of Type A must be adjusted for this purpose. He also asks Takashi what happened in CLIO. |
25 Dec. 2013 |
044 |
2013 Dec. 24 |
T. Suzuki |
Urgent! Suzuki-san will reserve the out gas measurement system at KEK for not only Nitofix but also Master bond. For baking, the spacer between magnet and mirror is necessary because baking mirror with glued magnet causes contamination. |
Control |
Suzuki-san asks Saito-san whether Nitofix is ultra high vacuum compatibleOut gas. |
|
045 |
2013 Dec. 24 |
D. Chen |
Closed. He provided. |
Sapphire monolithic suspension |
Dan will provide information about size of stepping motor, stage and weight. |
7 Jan. 2014 |
046 |
2013 Dec. 24 |
K. Hayama |
|
Vertical spring |
Kazuhiro Hayama evaluates the amplitude of gravitational wave from pulsars between 10Hz and 20Hz. He will take into account the direction of KAGRA interferometer and pulsars. |
7 Jan. 2014 |
047 |
2013 Dec. 24 |
D. Chen |
Closed. Dan explained his results.Vibration via heat links |
Vertical spring |
Dan and Takanori evaluated vibration via heat links with extra pendulum between cryo payload and cryocooler. Dan provides his shield vibration measurement result in Toshiba. Takanori will try simulation for heat links. Kazuhiro Yamamoto will give parameters. |
7 Jan. 2014 |
048 |
2014 Jan. 8 |
R. Kumar |
Closed. He did. Now, the target frequency is 14 Hz. Design is finished. Eiichi asked Shinkosha quotation. |
Sapphire monolithic suspension |
Rahul investigates folding sapphire blade spring by 10th of Jan. |
10 Jan. 2014 |
049 |
2014 Jan. 8 |
K. Yamamoto |
Closed. He counted and summarized in Japanese(17-18 pages of Payload strategy). |
Material |
Kazuhiro summaries the cables along bar between room and low temperature (control and thermometer) |
14 Jan. 2014 |
050 |
2014 Jan. 8 |
E. Hirose, T. Sekiguchi |
Closed. Platform. It could be on intermediate mass, but it is too busy. |
Control |
Eiichi and Takanori check whether thrust bearing is in platform or intermediate mass. |
14 Jan. 2014 |
051 |
2014 Jan. 14 |
E. Hirose |
Quotation arrived. |
Sapphire monolithic suspension |
Eiichi asks quotation for lower part in his idea. |
21 Jan. 2014 |
052 |
2014 Jan. 14 |
T. Sekiguchi |
Closed. He summarized his results Actuator Response of Cryogenic Payload with Different Suspension Points of Sapphire Fibers. |
Sapphire monolithic suspension |
Simulation to investigate the effect of the difference between the height of bending point and center of mass. |
|
053 |
2014 Jan. 14 |
R. Kumar |
|
Sapphire monolithic suspension |
Rahul investigates thermal distribution model. |
|
054 |
2014 Jan. 14 |
Y. Sakakibara |
Closed. He summarized his results (http://wiki.kek.jp/display/gw/Payload+Cool+Down). |
Material |
Yusuke measures annealed thermal conductivity of aluminum and copper. Higher temperature annealing could increase conductivity. |
|
055 |
2014 Jan. 14 |
T. Suzuki |
He found bundle. It consists of 734 thin lines (0.15 mm in diameter). 5N, 25 m in length. |
Material |
Suzuki-san looks for aluminum for CLIO in KEK. |
21 Jan 2014 |
056 |
2014 Jan. 14 |
T. Sekiguchi |
Urgent !Takanori is discussing with Ettore and Alessandro. |
Control |
We must decide strategy and schedule for LVDT |
|
057 |
2014 Jan. 14 |
D. Chen, K. Yamamoto |
Urgent ! |
Control |
Out gas from Photo diode, LED and motor should be checked. |
|
058 |
2014 Jan. 28 |
R. Takahashi |
Closed. Ryutaro asked and the answer is yes. So, we must go ahead.(#068) |
Overall design |
Ryutaro asks PROMEC that they can and will provide design drawing for cryogenic payload. |
|
059 |
2014 Jan. 28 |
T. Tomaru |
Closed. He asked Hasegawa Kikai Sekkei. They also know company for high precision assembly. We must take care of topic, budget and so on. |
Overall design |
Takayuki will contact some Japanese companies to ask that they can support to design cryogenic payload. |
|
060 |
2014 Jan. 28 |
Y. Sakakibara |
Closed. Minute is here Minutes of sapphire suspension test meeting. |
Sapphire monolithic suspension |
Yusuke prepares the document of plan for test of "cradle" sapphire suspension with screws |
|
061 |
2014 Jan. 28 |
T. Tomaru |
He did.->(#073) |
Overall design |
Takayuki asks CAD specialists to design of cryo duct above radiation shield. |
|
062 |
2014 Jan. 28 |
T. Suzuki |
It was delivered.(#075) |
Control |
Suzuki-san orders ceramic bearing for test. |
|
063 |
2014 Jan. 28 |
T. Tomaru |
He did. |
Overall design |
Takayuki prepares wiki in KEK for design drawings. |
|
064 |
2014 Feb. 4 |
T. Suzuki |
Closed. Suzuki-san circulated Koike-san's result([kagra-aos 00482] 24 May 2013). According to this result, 2 ton weight can be supported. |
Overall design |
Suzuki-san checks the largest weight for port on the upper side of vacuum chamber of cryostat. Whether they can support the frame for assembly, installation and protection of dropping mirror ? If the payload is put on the frame, it can still support (it does NOT imply that the frame can catch when the payload drops without any damage)? |
|
065 |
2014 Feb. 4 |
T. Akutsu |
Closed. Electro-chemical buffing (ECB) on A6xxx is possible and it is approved by Tomotada. On the 17th of June 2014, Azuma-san from Nichizo-Seimitsu Kemma corp. brought Tomotada a sample of ECBed A6xxx, and he did a visual inspection on it, and he felt it is sufficient.(->#135) |
Overall design |
Tomotada investigates ECB on Al6*** for wide angle scattered light baffle (although he has already asked ATC and they replied that it is possible). |
|
066 |
2014 Feb. 4 |
K. Yamamoto |
Closed. According to Miyoki-san's reply (3rd Feb 2014), this ceiling has crane. The largest weight is 2 ton. According to slides shown by Takayuki, it is 3 tons (this is the latest version). |
Overall design |
Kazuhiro Yamamoto asks Miyoki-san the strength of ceiling of clean room from point of view of installation of bottom filter (lowest part at room temperature) of Type A. |
|
067 |
2014 Feb. 4 |
K. Yamamoto |
Closed. Obuchi-san summarized his result Temperature distribution estimation of a wide-angle baffle (3). Kazuhiro replied (16 Feb 2014). Although temperature is 32 K in the highest case. However, radiation does not matter. Design will be in progress (->#023). |
Overall design |
Kazuhiro Yamamoto gives feedback about thermal simulation of baffle (requirement of temperature, heat path on baffle, deformation under gravity, in the case of SolBlack …). |
|
068 |
2014 Feb. 4 |
R. Takahashi, T. Suzuki |
Closed. If we would like to order PROMEC, KEK will order. In this case, the budget and so on must be taken care of. |
Overall design |
Preparation for PROMEC |
|
069 |
2014 Feb. 4 |
K. Yamamoto |
Closed.22nd and 23rd page of Cryogenic payload strategy (Japanese). |
Control |
Kazuhiro Yamamoto summarizes the effect of local Earth magnetic field fluctuation on coil magnet actuator. |
|
070 |
2014 Feb. 4 |
K. Yamamoto |
Closed. ->(#156) |
Control |
Kazuhiro investigates the diffraction loss by coil. |
|
071 |
2014 Feb. 18 |
C. Tokoku |
Closed. http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2321 |
Material |
Tokoku-san summarizes measurement of magnetism of stainless (316L, NSSC130S) and Solblack and DLC. |
|
072 |
2014 Feb. 18 |
T. Tomaru |
He did. Improvement is necessary. |
Overall design |
Takayuki prepares 3 dimensional CAD drawing in radiation shield. |
2014 Feb. 25 |
073 |
2014 Feb. 25 |
T. Tomaru and R. Takahashi |
Closed. He did and introduce his idea about cryo duct and we discussed in this meeting (4th of March 2014). |
Overall design |
Takayuki asked Ryutaro details around boundary between room and cryogenic temperature. |
|
074 |
2014 Feb. 25 |
T. Suzuki |
Overall design |
Suzuki-san discusses protection strategy for mirror and shield in SEO meeting. |
|
|
075 |
2014 Feb. 25 |
T. Suzuki, T. Tomaru |
Control |
Ceramic bearing test |
|
|
076 |
2014 Feb. 25 |
E. Hirose |
Closed. Unfortunately, quotation itself is challenging. |
Sapphire monolithic suspension |
Eiichi asks CSIRO can polish barrel surface and make sapphire block which has round surface (curvature of radius is exactly same as that of mirror barrel surface). |
|
077 |
2014 Feb. 25 |
T. Suzuki |
Closed. Eiichi has a quotation. |
Sapphire monolithic suspension |
Suzuki-san checks old quotation about diffusion bonding from Japan cell. |
|
078 |
2014 Feb. 25 |
T. Tomaru |
Closed. He did it and shows the results and we discussed in this meeting (4th of March 2014). |
Overall design |
Takayuki investigates plan 3 for radiation shield protection. In this plan, the system will be installed to support ceiling of radiation shield to avoid break of radiation shield when cryo payload and so on drop. |
|
079 |
2014 Feb. 27 |
K. Yamamoto |
Closed. (#099) |
Overall design |
Kazuhiro fixes the dimension of wire between Bottom filter and Platform (Ti-6Al-4V) and check it can be manufactured. |
|
080 |
2014 Feb. 27 |
K. Yamamoto |
Closed. p26-31 of Cryogenic payload strategy(Japanese). |
Overall design |
Kazuhiro checks whether 80 cables can be along the metal wire between Bottom filter and Platform. Mockup (#034) can be useful. |
|
081 |
2014 Mar. 4 |
T. Tomaru |
Closed. He did and showed in this meeting Cryo duct on the ceiling of radiation shield. |
Overall design |
Takayuki circulates the design drawing of the cryo duct on the ceiling of radiation shield. |
|
082 |
2014 Mar. 4 |
T. Suzuki |
Closed. Unfortunately, it is not appropriate for our purpose. We must prepare and consider installation and jigs. It could be practice. ->(#090) |
Overall design |
Suzuki-san asks Toshiba whether there are still the flange plate at the top of cryostat for cooling test or not. |
|
083 |
2014 Mar. 4 |
|
Sapphire monolithic suspension |
Details of strength test of sapphire blade spring are considered (also clamp). Ettore suggested the measurement of resonant frequency of horizontal motion of sapphire blade spring. |
|
|
084 |
2014 Mar. 4 |
T. Tomaru |
Closed. He reported.->(#094) |
Overall design |
Takayuki checks the view ports of cryostat for SHORT RANGE optical lever. |
|
085 |
2014 Mar. 4 |
K. Yamamoto |
Closed. Quotation arrived. |
Sapphire monolithic suspension |
Kazuhiro will ask Japan Cell quotation for direct bonding (5mm*10mm*20mm, 60 blocks). |
|
086 |
2014 Mar. 6 |
|
Overall design |
Vertical drift by thermal shrink |
|
|
087 |
2014 Mar. 8 |
|
Takayuki put screw holes on the top plate. |
Overall design |
Monitor system for top of the cryo duct on the ceiling of radiation shield. (only for installation ?, where (from bottom filter side)?, monitor system for wire to suspend bottom filter (there are appropriate view ports.))Optical view port ? |
|
088 |
2014 Mar. 11 |
T. Tomaru |
Closed. Takayuki prepared (便利な道具・必要物品(Tool list) on KEK wiki). |
Overall design |
Takayuki prepares "necessary item" list in wiki. If somebody finds something necessary, s/he writes it. |
|
089 |
2014 Mar. 11 |
T. Tomaru |
Closed. He and Suzuki-san has kick off meeting with Mitaka-koki. They visited Mitaka-koki and Oshimashisaku on the 6th of June 2014.-> Kume-san introduces a company (VIC international). They come KEK on the 2nd or 3rd of July for the meeting. -> Kume-san is a contact person for VIC international.-> Suzuki-san and Takayuki will visit VIC on the 12th of November.->We ordered test fabrication of intermediate mass part to VIC. |
Overall design |
Takayuki looks for company for mechanical manufacture. |
|
090 |
2014 Mar. 11 |
T. Suzuki, T. Tomaru |
Hagiwara-san wrote design. |
Overall design |
Suzuki-san and Takayuki prepare the flange at the top of cryostat to separate cryostat from room temperature part. This flange must have ears for installation. |
|
091 |
2014 Mar. 11 |
K. Yamamoto |
Closed. He did. p8-9 of Cryogenic payload strategy(Japanese).->(#118)(#164) |
Material |
Kazuhiro Yamamoto summarizes the requirement of magnetism. |
|
092 |
2014 Mar. 11 |
T. Tomaru |
Closed. He did.->(#117) |
Material |
Takayuki investigates how to anneal tungsten. |
|
093 |
2014 Mar. 11 |
Y. Sakakibara |
Material |
Yusuke check where Al samples with clamps for thermal resistance measurement. |
|
|
094 |
2014 Apr. 9 |
T. Tomaru |
Closed. He showed the result in the integration meeting (13 May 2014)->(#102) |
Overall design |
Takayuki will check effective aperture (because the window surface is not perpendicular to ray) of optical view port (400 mm above sapphire mirror). |
|
095 |
2014 Apr. 9 |
T. Tomaru |
Overall design |
Takayuki will check the size of door of radiation shield as the upper limit of size of items in shield. |
|
|
096 |
2014 Apr. 9 |
K. Yamamoto |
Marielle van Veggel and Kazuhiro Yamamoto discussed and Kazuhiro summarized (Marielle (2014 May 23).docx on KEK wiki). |
Sapphire monolithic suspension |
Kazuhiro Yamamoto asks Rahul details of how to attach ears on mirror with Hydroxide Catalysis Bonding. Or he asks somebody who stay in Kashiwa from Glasgow before GWADW. |
|
097 |
2014 Apr. 9 |
T. Tomaru and K. Yamamoto |
Closed. Takayuki got control circuit kit to operate pytron stepping motor. |
Control |
Kazuhiro Yamamoto and Takayuki check or look for driver of stepping motor. |
|
098 |
2014 Apr. 9 |
K. Yamamoto |
Closed. (#105) |
Vertical spring |
Kazuhiro Yamamoto will check three blades can be installed in 1/4 cryostat. |
|
099 |
2014 Apr. 9 |
T. Kume and K. Yamamoto |
Kazuhiro will summarize the specification of Ti-6Al-4V bar (shorter one when the cryostat is separated from room temperature part). Hagiwara-san will draw design and Kume-san asks the company. The number is 2 or 3.-> We must consider the details of cryo payload at the same time. It is useful to make test piece with nail head. |
Material |
Ti-6Al-4V is the candidate as bar between low and room temperature. Kazuhiro Yamamoto will fix specification and ask company. |
|
100 |
2014 Apr. 9 |
K. Yamamoto |
Closed. 5th page of Cryogenic payload strategy(Japanese). |
Material |
Kazuhiro will check the thermal noise of heat links. |
|
101 |
2014 Apr. 9 |
K. Yamamoto |
Closed. Ryutaro replied. For test, they will prepare 3 OSEM with normal PEEK. One of them can be used for cryogenic test. |
Control |
Kazuhiro Yamamoto asks Takahashi-san status of OSEM. |
|
102 |
2014 Apr. 15 |
CRY |
Overall design |
CRY summarizes the requirement of optical lever and so on (motivation and design, wavelength, budget …). CRY is charge of optical lever near cryostat |
|
|
103 |
2014 Apr. 30 |
T. Tomaru and K. Yamamoto |
ICRR has two pieces. We can use them. |
Sapphire monolithic suspension |
They look for sapphire bulk for test of ear connection (100mm in diameter ) in KEK and ICRR, respectively. |
|
104 |
2014 Apr. 30 |
D. Chen, A. Khalaidovski, K. Yamamoto |
Sapphire monolithic suspension |
They make research plan in FY2014 based on Grant-in-Aid for Specially Promoted Research. It includes report of outline of sapphire mirror suspension (final version), purchase plan for fibers and so on, test of connection between mirror and ears, blade spring test, how to assemble. |
|
|
105 |
2014 Apr. 30 |
R. Takahashi, T. Tomaru |
Vertical spring |
Schedule must be revised (small sample test for material properties investigation and prototype for 1/4 cryostat and thermal compensation system). |
|
|
106 |
2014 Apr. 30 |
T. Tomaru |
Vertical spring |
Takayuki prepares experiment for small sample test for material properties investigation. |
|
|
107 |
2014 Apr. 30 |
T. Uchiyama |
Closed. The answer is yes. |
Overall design |
Takashi Uchiyama checks whether MESCO knows the details of the new path from storage warehouse to KAGRA site. |
|
108 |
2014 Apr. 30 |
T. Suzuki and T. Tomaru |
Closed. It is not necessary because 1/4 cryostat will be moved to KEK. |
Vertical spring |
They prepare to move a tank of liquid nitrogen to ICRR. |
|
109 |
2014 Apr. 30 |
D. Chen, R. Kumar, K. Yamamoto |
In progress. Bending length of thick fibers and Cryogenic meeting on 2014/8/26(chen)-> Still in progress Bending length evaluation.-> Kazuhiro proceeded with analytical investigationAnalytical investigation about bending length. He found that “geometrical” bending length is different from “physical” one. The latter is almost the same as “traditional” one. Dan will try simulation for “physical” bending length. If he shows new result within one week, we revise the design for Zygo (#157).-> Unfortunately no results. Thus, we adopt Kazuhiro’s analytical formula.(#159) |
Sapphire monolithic suspension |
They check the definition and calculation of bending length. It could be shorter than we expect. |
|
110 |
2014 Apr. 30 |
D. Chen, R. Kumar |
Closed. According to Rahul’s slides Thermal noise performance of the cryogenic sapphire suspension system for the KAGRA detector, the 1st violin mode frequency is 221 Hz. Dan also showed similar result Cryogenic meeting on 2014/8/5(chen). According to Kazuhiro’s analytical calculation Thermal noise in KAGRA (GWADW2014), 1st violin mode frequency WITHOUT blade spring is 220Hz. So, blade spring does not change violin mode drastically. |
Sapphire monolithic suspension |
Rahul or Dan calculate the violin modes with blade spring. |
|
111 |
2014 Apr. 30 |
K. Yamamoto |
Material |
Kazuhiro Yamamoto check the effect of weight of heat link. For example, their weight can stretch the vertical spring. |
|
|
112 |
2014 Apr. 30 |
K. Yamamoto |
Closed. Cryogenic payload requirement(English). |
Overall design |
Kazuhiro summarize memo Cryogenic payload strategy(Japanese). He add figure to show requirements of each part in cryo payload. |
|
113 |
2014 May 13 |
T. Tomaru |
Direction of shutter must be checked. |
Overall design |
Takayuki checks how to remove the optical window of the radiation shield. |
|
114 |
2014 May 13 |
T. Suzuki, N. Kimura, T. Tomaru |
Closed. We decide that SI of Toshiba duct is used as vacuum duct. SI of this duct is reused for pipe of SAS. |
Overall design |
Suzuki-san, Kimura-san, and Takayuki discuss whether SI of Toshiba can be used for cryo duct on the radiation shield. |
|
115 |
2014 May 13 |
S. Koike |
Closed. Strength is enough large. |
Overall design |
Koike-san check the strength of ceiling of radiation shield (whether somebody can assemble this duct or not). |
|
116 |
2014 May 13 |
|
Overall design |
Design for jigs to fix and summarize cables along SAS and cryopayload chain. |
|
|
117 |
2014 May 13 |
D. Chen |
Material |
Dan will measure Q and thermal conductivity tungsten annealed by Takayuki. |
|
|
118 |
2014 May 13 |
Y. Sakakibara |
Material |
Yusuke evaluate effect of magnetism using ANSYS in order to check Kazuhiro’s calculation (#091). |
|
|
119 |
2014 May 13 |
R. Kumar |
Rahul started design. |
Sapphire monolithic suspension |
Rahul prepares the measurement of mechanical loss on the surface of sapphire fibers. |
|
120 |
2014 May 13 |
|
Control |
Measurement or evaluation of 300K radiation through a optical window |
|
|
121 |
2014 May 13 |
T. Tomaru |
Control |
Takayuki asks Hagiwara-san to check CAD about tunnel for optical laver. |
|
|
122 |
2014 May 13 |
K. Yamamoto |
Closed. It was delivered.(->#137) |
Control |
Kazuhiro will order master bond |
|
123 |
2014 May 13 |
K. Yamamoto |
Closed. Ettore said that quadrupole is not discussed so far. |
Control |
Kazuhiro asks Ettore whether the quadrupole of a tine magnet is a problem in coil magnet actuator. |
|
124 |
2014 May 13 |
K. Yamamoto |
Closed. Luca's paper is here [http://iopscience.iop.org/0957-0233/25/1/015103/article]. Although resistance of coil at cryogenic temperature is much smaller, calibration coefficient is independent of temperature because circuit components are moved outside cryostat if possible. Displacement sensitivity is 50pm/rtHz. |
Control |
Kazuhiro checks Luca’ paper (a part of LVDT). |
|
125 |
2014 May 13 |
D. Chen |
Control |
Dan consults Jena people (requirement of moving mass). |
|
|
126 |
2014 May 20 |
T. Tomaru |
Material |
Takayuki prepares the annealed tungsten wires for Q and thermal conductivity measurement. |
|
|
127 |
2014 May 20 |
D. Chen |
Closed. Discussion is in progress. Now flatness is an issue. It is not so good (around lambda) for Hydroxide Catalysis Bonding. Dan will ask how much flatness of small block is. After reply, we discuss. ->Flatness is OK in the case of small block. We will order soon.-> Flatness is ok even if the block is large with small polished area. We ordered on the 27th of June 2014. |
Sapphire monolithic suspension |
Dan will ask whether Shinkosha have pieces whose size is similar to what he wants for one fiber prototype test. |
|
128 |
2014 May 20 |
D. Chen |
Closed. Takayuki proposed new cut (it is not parallel). Dan checks the peeling stress (Strength.pdf and strength(2).pdf). Sascha started the discussion with IMPEX. |
Sapphire monolithic suspension |
Dan will evaluate stress of peeling between ears and mirror. Moreover he designs flat cut and ears. |
|
129 |
2014 Jun. 3 |
|
Closed. Kazuhiro asked Saito-san. Duct for Type A chains will be delivered on the 11th of Aug. And they will be installed in shaft soon. The part which is between cryostat and Type A chain (it includes 900mm diameter ports for GAS filter connected to cryopayload) will be put near cryostat. It will be installed later and jigs for installation is necessary. Design (structure) and schedule of clean booth must be clear (#142). |
Overall design |
Installation procedure of duct for Type A chain and cryostat must be checked. |
|
130 |
2014 Jun. 3 |
K. Yamamoto |
Closed. We reuse sapphire cylinder for indium bonding. |
Sapphire monolithic suspension |
Kazuhiro will ask status of sample for Q measurement of Hydroxide Catalysis Bonding. |
|
131 |
2014 Jun. 3 |
D. Chen, K. Yamamoto |
Closed. Jena group kindly provided. |
Sapphire monolithic suspension |
Dan checks where indium is. If necessary, Kazuhiro purchases and send it to Jena. |
|
132 |
2014 Jun. 10 |
D. Chen |
Closed. He result shows that it does not matter. test.pdf on Simulation of sapphire suspension under gravity |
Sapphire monolithic suspension |
Dan checks effect by stress of slit of the blade spring. |
|
133 |
2014 Jun. 17 |
T. Suzuki, N. Kimura, T. Tomaru |
Closed. We can use the car from the beginning of August. |
Overall design |
Car leasing must be prepared. |
|
134 |
2014 Jun. 17 |
T. Akutsu |
Overall design |
Tomotada must fix which new cryoduct or Toshiba one will be used for BS side. |
|
|
135 |
2014 Jun. 24 |
T. Akutsu and somebody |
Overall design |
Measurement of scattering distribution and specular reflectivity of SolBlack on Electro-chemical buffing (ECB) on A6xxx |
|
|
136 |
2014 Jun. 24 |
S. Koike |
Closed. He did it. |
Overall design |
Koike-san will prepare drawing of parts (for cost evaluation) of pipe for SAS. |
|
137 |
2014 Jun. 24 |
K. Yamamoto |
Closed. Suzuki-san brought master bond and stainless steel for out gas test.->(#044). |
Control |
Suzuki-san brought stainless steel for out gas test of Master Bond. Kazuhiro will prepare (0.1mm in thickness). |
|
138 |
2014 Jun. 24 |
T. Suzuki |
Control |
Mitsubishi cable industries can provide polyimide line for coil. Suzuki-san checks out gas . |
|
|
139 |
2014 Jun. 24 |
K. Yamamoto |
Vertical spring |
Kazuhiro will summarize the requirement and so on. |
|
|
140 |
2014 Jul. 08 |
T. Suzuki |
Overall design |
Suzuki-san consider shift at KAGRA site (before assembly). |
|
|
141 |
2014 Jul. 08 |
Y. Sakakibara and somebody |
Closed. Kume-san succeeds. |
Overall design |
Somebody will learn how to use application software and calculate transfer heat and so on (Yusuke will teach). |
|
142 |
2014 Jul. 15 |
T. Suzuki and N. Kimura |
Overall design |
Suzuki-san and Kimura-san discuss the assembly schedule and structure of clean booths. |
|
|
143 |
2014 Jul. 23 |
K. Yamamoto |
Closed. He revised old report. measurement of mechanical loss of attachment of actuator and fiber |
Control |
Kazuhiro checks his old calculation to evaluate thermal noise by magnet before Dan will calculate. |
|
144 |
2014 Aug. 26 |
|
Overall design |
We must check whether there is the contradiction between setting base-pin and wall painting. |
|
|
145 |
2014 Aug. 26 |
|
Overall design |
We decide concrete requirement for measurement and alignment accuracy. |
|
|
146 |
2014 Aug. 26 |
K. Yamamoto |
Closed. Dan summarized. Requirement of mechanical loss in http://wiki.kek.jp/display/gw/Sapphire+suspension. |
Sapphire monolithic suspension |
Kazuhiro will summarize the requirement of loss in each part of sapphire suspension in schematic view. |
|
147 |
2014 Aug. 26 |
K. Yamamoto |
Kazuhiro Hayama explained impact of first violin modeバイオリンモードスタディ. The length should be between 300 mm and 350mm. |
Sapphire monolithic suspension |
The sapphire fiber length must be decided soon. |
|
148 |
2014 Aug. 26 |
T. Tomaru, S. Koike |
Overall design |
Takayuki and Koike-san simulate the internal mode of the platform. |
|
|
149 |
2014 Aug. 26 |
R. Kumar |
Sapphire monolithic suspension |
Rahul summarizes his result file and their explanation for somebody else and writes short report for the paper. |
|
|
150 |
2014 Aug. 26 |
K. Yamamoto |
Closed. Gravitational Wave Project Office decided to keep the licenses in the next one year. ANSYS server will be in ICRR. People in KEK can access via VPN. If Rahul needs this server as an excellent computer, he will conduct the procedure (he changes server machine and so on… ). |
Sapphire monolithic suspension |
Kazuhiro consults Miyoki-san to keep ANSYS licenses in Gravitational Wave Project Office, ICRR and to move Rahul's server to KEK. |
|
151 |
2014 Aug. 26 |
K. Yamamoto |
Closed. Karen reported the result on 10th of Feb, ELiTES meeting (http://events.ego-gw.it/indico/getFile.py/access?contribId=14&sessionId=3&resId=0&materialId=slides&confId=16). |
Sapphire monolithic suspension |
Kazuhiro asks Sheila Rowan the status of Hydroxide Catalysis Bonding. |
|
152 |
2014 Sep. 9 |
T. Tomaru |
Closed. He did it. http://wiki.kek.jp/display/gw/Photo |
Overall design |
Takayuki prepares summary page for photos on KEK wiki. |
|
153 |
2014 Sep. 9 |
T. Akutsu |
We discussed (17 Sep 2014) and CRY group have no preference of the direction of the wedge direction (if the the ray is on the horizontal plane).-> We discuss again (21 Oct 2014). Kimura-san circulated e-mail that day. We must decide the direction of this duct by 24th of Oct. We discussed and agreed as follow; the duct is on the narrow side. However, we must check some details.(#165)(#166)(#167). |
Overall design |
Since the ETM has wedge (0.2degree +/-0.1 degree), the angle between duct shield behind ETM and optical axis cannot be zero. Tomotada will summarize details (angle, which side, and so on …) and tell Kimura-san later. |
|
154 |
2014 Sep. 9 |
K. Yamamoto, T. Suzuki |
Closed. We had the meeting on the 3rd of Oct. We will purchase as recoil mass. |
Material |
We must contact Nippon Steel & Sumitomo metal for low magnetism stainless steel. |
|
155 |
2014 Sep. 9 |
D. Chen, K. Yamamoto |
Closed. Three blade springs were delivered on the 1st of October nevertheless we did not visit Shinkosha. |
Sapphire monolithic suspension |
We must visit Shinkosha after the meeting of Physical Society of Japan. |
|
156 |
2014 Sep. 9 |
|
Control |
We should consider the specification of coil magnet actuator on the sapphire mirror (and coating. If the coating covers the mirror surface perfectly, it could be a problem when the magnets are attached). Diffraction loss must be also considered. |
|
|
157 |
2014 Sep. 9 |
D. Chen, K. Yamamoto |
Closed. Suzuki-san sent e-mail to MIR on the the 30th of October. |
Sapphire monolithic suspension |
Zygo will start to evaluate how much the flat cut gives damage on the reflective surface. CRY must provide the design. Kazuhiro tells the polish specification and the direction of a-axis. Hagiwara-san will prepare the design. Takyuki circulates it in CRY. Suzuki-san will send it to MIR as chief of CRY. At that time, he will ask (1)to check what Zygo is going to investigate, (2)to send carbon copy of e-mail to Zygo. |
|
158 |
2014 Sep. 17 |
T. Tomaru |
Closed. He made (http://wiki.kek.jp/pages/viewpage.action?pageId=37159777). |
Overall design |
Takayuki makes the wiki page to summarize the important points in the specification list for bidding. For example, we need the room for assembly which is next to the cryostat (and people can stay), tools,.. |
|
159 |
2014 Sep. 17 |
D. Chen, R. Kumar |
Sapphire monolithic suspension |
They check the analytical investigation of bending length using Finite Element Method.(#109) |
|
|
160 |
2014 Oct. 7 |
T. Tomaru |
Overall design |
Takayuki later prepares wiki to write idea about clean booth and so on. |
|
|
161 |
2014 Oct. 7 |
T. Tomaru |
Claosed. Takayuki is discussing with detchar 27th of Nov at Osaka City University. ->(#198) |
Overall design |
CRY and detchar will summarize the environmental monitor and connection and so on. |
|
162 |
2014 Oct. 7 |
|
Overall design |
We add two level markers in Y end. At least, one markers must be seen everywhere |
|
|
163 |
2014 Oct. 7 |
|
Sapphire monolithic suspension |
Cold damping for violin mode and so on. |
|
|
164 |
2014 Oct. 21 |
K. Yamamoto |
Overall design |
We must decide the requirement for magnetism of SolBlack (Barkhausen effect). |
|
|
165 |
2014 Oct. 21 |
N. Kimura, T. Suzuki |
Closed. The end of the cryo duct can be moved within +/- 20mm. Kimura-san reported in the chief meeting (27 Oct 2014 http://gwclio.icrr.u-tokyo.ac.jp/lcgtchief/20141027.html) |
Overall design |
Beam Reducing Telescope duct behind the end cryostat : The error of wedge angle of sapphire mirror is not so small. Thus some “long” hole part around Beam Reducing Telescope. Kimura-san and Suzuki-san (with Torisha) check how much this hole could be long. |
|
166 |
2014 Oct. 21 |
|
Overall design |
It is necessary to check the ACTUAL size of tunnel and rooms around Beam Reducing Telescope(whether crane can be near wall and so on). |
|
|
167 |
2014 Oct. 21 |
|
Sapphire monolithic suspension |
Precision in installation: The light transmitted by a sapphire end mirror could not be on the horizontal plane. |
|
|
168 |
2014 Oct. 28 |
T. Tomaru |
Overall design |
In order to record the progress of installation, interval recorders (for example, http://www.kingjim.co.jp/sp/recolo_ir7/index.html) will be purchased by Takayuki. |
|
|
169 |
2014 Oct. 28 |
|
Overall design |
We must take care of the budget (truck for the heads on the sides of cryostat, front room, payload assembly room, office room for shift, rack) |
|
|
170 |
2014 Oct. 28 |
|
In fact, length difference of fiber is larger issue. In the worst cases (according to Kazuhiro’s measurement; http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3129), the difference could be about 1 mm. In such a case, shim is necessary. |
Sapphire monolithic suspension |
1/300 radian gradient problem must be considered (Since the KAGRA baseline has the 1/300 radian gradient, sapphire mirror must be tilted. The stress in the sapphire fiber must be as small as possible.). |
|
171 |
2014 Nov. 26 |
|
Overall design |
One Pfeiffer full range gauge is purchased to monitor the pressure in main vacuum chamber of cryostat. |
|
|
172 |
2014 Nov. 26 |
|
Overall design |
CRY is responsible for interlock of Gate Valve. It takes one minute to close valve. |
|
|
173 |
2014 Nov. 26 |
K. Hayama |
Kazuhiro Hayama will develop. |
Overall design |
Development of software to show real time status |
|
174 |
2014 Nov. 26 |
T. Suzuki |
Overall design |
Dummy recoil mass : Some parts will be done by some companies. The other parts will be made by Terashima-san. Suzuki-san organizes. |
|
|
175 |
2014 Dec. 16 |
K. Yamamoto |
Sapphire monolithic suspension |
We will ask IMPEX how to wash sapphire fibers. |
|
|
176 |
2014 Dec. 16 |
H. Tanaka |
Sapphire monolithic suspension |
Reconnection of HEM fiber and nail head with Hydroxide Catalysis Bonding(the fiber went from the nail head). |
|
|
177 |
2014 Dec. 16 |
H. Tanaka |
Sapphire monolithic suspension |
Ettore found a company which has HEM sapphire. We check the cost and delivery date of HEM fiber. |
|
|
178 |
2015 Jan. 13 |
|
Overall design |
Air circulation system for 2nd floor is absolutely necessary. |
|
|
179 |
2015 Jan. 13 |
|
Tomotada pointed out that the deadline of the submission for joint research with NAOJ is on the 23rd of Jan. It is better to consult with Raffaele or Yoichi in advance. |
Overall design |
Collaboration between KEK and NAOJ is necessary. |
|
180 |
2015 Jan. 13 |
T. Tomaru |
Closed. The meeting was held on the 9th of March 2015 at NAOJ. The memo of this meeting (Japanese) is here (http://wiki.kek.jp/display/gw/Discussion+based+on+CAD+drawing). |
Overall design |
CRY consult VIS control system. Takayuki organizes this meeting. |
|
181 |
2015 Jan. 13 |
T. Tomaru |
|
Overall design |
Takayuki looks for cart at golf courses. |
|
182 |
2015 Jan. 13 |
D. Chen, T. Miyamaoto, Y. Sakakibara, H. Tanaka, K. Yamamoto |
Miyomoto-kun, Tanaka-kun, and Kazuhiro made samples under supervision of Dan and Yusuke. Kazuhiro is summarizing the manual. |
Sapphire monolithic suspension |
Before Dan and Yusuke leave, Hiroki, Takahiro, and Kazuhiro learn how to make Hydroxide Catalysis Bonding, to handle experimental apparatus and ANSYS and so on. Although Dan and Yusuke are busy, we must coordinate our schedule. |
|
183 |
2015 Jan. 13 |
K. Yamamoto |
Closed. Kazuhiro checked and prefer Nitofix to water glass.->(#190),(#191) |
Sapphire monolithic suspension |
Dummy sapphire fibers : Photran fibers in KEK and sapphire blocks with hole (we ordered Shinkosha) are combined (water glass or epoxy glue) as dummy sapphire fibers. The practice and jigs for assembly are necessary. |
|
184 |
2015 Jan. 13 |
K. Yamamoto |
Frame is OK. Maximum load of lab jack must be checked. |
Sapphire monolithic suspension |
Frame and lab jack for full size sapphire suspension prototype: Kazuhiro will check whether the frame and lab jack for 1/2 dummy payload can be used. |
|
185 |
2015 Jan. 13 |
K. Yamamoto |
Closed. We will make it (#187) |
Sapphire monolithic suspension |
Assembly jigs to support the mirror of full size prototype: Size of sapphire bulk for prototype is slightly different from that of the actual KAGRA mirror. We must consider whether the jig for prototype will be prepared or not. First of all, Kazuhiro will check the jig for actual mirror can be used for prototype sapphire bulk. |
|
186 |
2015 Jan. 20 |
D. Chen and R. Kumar |
Closed.->(#201) |
Sapphire monolithic suspension |
Dan will tell Rahul details of Dan’s simulation. Crosscheck should be taken care of. |
|
187 |
2015 Jan. 20 |
K. Yamamoto |
Hagiwara-san wrote. Kazuhiro must check. |
Sapphire monolithic suspension |
Assembly jigs to support the mirror : Size of sapphire bulk for prototype is slightly different from that of the actual KAGRA mirror. We must prepare it. Kazuhiro will tell Hagiwara-san details later. |
|
188 |
2015 Jan. 28 |
H. Tanaka |
|
Sapphire monolithic suspension |
Improvement of cryostat with vibration reduction system (H. Tanaka): 350mm fiber should be included. Exchange gas system is necessary. |
|
189 |
2015 Feb. 17 |
|
|
Overall design |
At X-end, there are four hooks. But three of them cannot be used because of falling water. This problem must be fixed. |
|
190 |
2015 Feb. 17 |
K. Yamamoto |
|
Sapphire monolithic suspension |
Kazuhiro checks the strength (whether it can support 6kg weight or not) of Nitofix for dummy sapphire fiber (photoran straight sapphire fiber and sapphire block with hole from Shinkosha). |
|
191 |
2015 Feb. 17 |
K. Yamamoto |
|
Sapphire monolithic suspension |
For dummy sapphire fiber (photoran straight sapphire fiber and sapphire block with hole from Shinkosha), the jig to fix the blocks and the fiber before dry must be considered. |
|
192 |
2015 Feb. 17 |
|
|
Sapphire monolithic suspension |
Assembly jigs for full size prototype sapphire suspension is designed and manufactured (We order not only Mechanical Engineering Center of KEK but also mechanical workshop at Institute for Solid State Physics, check and write drawing…). |
|
193 |
2015 Feb. 17 |
D. Chen, R. Kumar, T. Miyamaoto, Y. Sakakibara, H. Tanaka, T. Tomaru, K. Yamamoto |
Closed. Everything was done. |
Overall design |
Tanaka-kun, Miyamoto-kun, Takayuki, Rahul, and Kazuhiro learn how to use ANSYS, codes to calculate initial cooling time and vibration isolation of cryogenic payload, Zemax. |
|
194 |
2015 Mar. 3 |
R. Kumar |
|
Sapphire monolithic suspension |
Ronny proceeds with thermal resistance measurement inside smaller cryostat. Rahul learns. |
|
195 |
2015 Mar. 3 |
T. Tomaru, K. Yamamoto |
Closed. Ueda-san and Tatsumi-san measured(http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=3455). |
Sapphire monolithic suspension |
Suzuki-san and Takayuki pointed out that it is better to measure the flatness by ourselves although ARD-OPTICS Ltd sends. Takayuki and Kazuhiro will look for who can measure. |
|
196 |
2015 Mar. 3 |
|
|
Sapphire monolithic suspension |
We must practice with larger sample for Hydroxide Catalysis Bonding. |
|
197 |
2015 Mar. 3 |
T. Tomaru |
|
Sapphire monolithic suspension |
Application software for CAD should be prepared (one space designer license in KEK will be expired at the end of March 2015). |
|
198 |
2015 Mar. 10 |
|
Closed. These monitor system will be installed at X end in the week of 13th of April 2015. |
Overall design |
Measurement of seismic motion at KAGRA site in long term: For measurement of sound pressure, we look for audio amplifier and microphone. Suzuki-san checks the magnetic flux meter. |
|
199 |
2015 Mar. 17 |
T. Tomaru |
|
Overall design |
Takayuki asks Yoichi reconsideration about requirement for the aperture of the recoil mass (If the aperture is large, coil magnet actuator should be smaller. It is not so easy). |
|
200 |
2015 Apr. 7 |
|
|
Overall design |
Simple clean booth for front cryostats before October 2016 and the clean booth at the top of Type A must be considered by CRY and VIS, respectively. |
|
201 |
2015 Apr. 21 |
|
|
Sapphire monolithic suspension |
Indium contribution calculation by Dan and Rahul is checked. |
|
202 |
2015 Apr. 21 |
|
|
Sapphire monolithic suspension |
We consider whether we make the slit of sapphire blade spring larger. |
|
203 |
2015 Apr. 21 |
T. Tomaru, K. Yamamoto |
|
Sapphire monolithic suspension |
Takayuki and Kazuhiro check the stock of sapphire in KEK and ICRR, respectively for sapphire fiber clamp. |
|
204 |
2015 Jun. 2 |
|
|
Overall design |
Dropbox to share the latest CAD drawing (VIS and CRY) is prepared. The memo which describes the contents of CAD is necessary. The link to dropbox is on the KAGRA wiki. |
|
205 |
2015 Jun. 2 |
|
|
Overall design |
The procedure of exchange of dummy load for Type A and cryo payload should be considered. Some devices to support and move payload (in vertical) are necessary. |
|
206 |
2015 Jun. 2 |
|
|
Overall design |
Thermometers near GAS filters are necessary (not only for DetChar, but also VIS itself) |
|
207 |
2015 Jun. 2 |
|
|
Overall design |
Vacuum chamber for BRT : Since there is no drawing, the cylinder whose diameter is 1.2m and height is 2m will be written in design drawings. |
|
208 |
2015 Jun. 2 |
|
Closed. Takahiro shows result; he assumed that length is 250mm, thickness is 2mm, width is 40mm. In this case, appropriate load is 9.73kg weight. Since payload is 120kg in weight, we need 12 blades.->(#214) |
Vertical spring |
In order to make platform smaller, Takahiro ask Takanori how to design GAS filter. Rahul simulates the smaller (but similar) GAS filter. |
|
209 |
2015 Jun. 2 |
|
|
Overall design |
Rahul investigates new ideas as follow;(1)We would like to reduce of weight Recoil mass of marionetta (40kg->20kg).(2)Recoil mass of intermediate mass (In current design, there is no such mass.)(3)Rigid connection between recoil mass of marionette and that of intermediate mass (as below photo)(4)Rigid connection between marionette and intermediate mass. |
|
210 |
2015 Jun. 2 |
|
|
Overall design |
We must also consider cables of sensors. |
|
211 |
2015 Jun. 9 |
|
|
Sapphire monolithic suspension |
In order to check how Q-values depend on the surface, Kazuhiro later will send the IMPEX monolithic fiber to Takayama-san(National Institute for Fusion Science). |
|
212 |
2015 Jun. 9 |
K. Yamamoto |
|
Material |
Kazuhiro proceeds with the procurement of low magnetism stainless steel. He will ask whether the increase of magnetism by processing can be reduced by heat treatment. |
|
213 |
2015 Jun. 16 |
|
|
Overall design |
Since it is not easy to carry something along Y arm, maybe we carry from Mozumi entrance. In this case, some cranes or something similar are necessary at Mozumi entrance (Truck from outside cannot enter the KAGRA site !) |
|
214 |
2015 Jun. 16 |
|
|
Vertical spring |
Hagiwara-san checks whether these 12 blade springs (simulated by Takahiro (#)208) can be installed in platform or not. |
|
215 |
2015 Jun. 16 |
|
|
Vertical spring |
Takahiro upload memo about how to design blade spring in GAS (in short what Takanori taught) on KEK wiki. |
|
216 |
2015 Jul. 8 |
|
|
Sapphire monolithic suspension |
Jig for ears on mirror during Hydroxide Catalysis Bonding process. The adjustment along direction which is perpendicular to optical axis is difficult. The end of flat cut is not good reference. Moreover, how to put mark (and remove later) is not an easy issue. Hiroki and Kazuhiro are considering. |
|
217 |
2015 Jul. 8 |
|
|
Sapphire monolithic suspension |
Final version of design drawing of end sapphire mirror will be uploaded on KEK wiki. |
|
218 |
2015 Jul. 31 |
|
|
Overall design |
The acceptable delay of bKAGRA should be considered and discussed. |
|
219 |
2015 Jul. 31 |
T. Tomaru |
|
Sapphire monolithic suspension |
3 dimension measurement system is necessary to check position of ear after bonding. Takayuki proposed table top one (CMM) and looks for it. |
|
220 |
2015 Jul. 31 |
A. Hagiwara |
|
Overall design |
Hagiwara-san introduced new CAD drawing of Type A to vacuum chamber. She thinks that check by VIS is necessary. As first step, her drawing is uploaded in dropbox. |
|
221 |
2015 Jul. 31 |
|
|
Overall design |
We observed motion of first floor. So, we must check motion of the second floor. The results of survey on the first and second floors must be connected (via slope or stairs ?). Round connection is better. In any cases, VIS and CRY must consider carefully (not only survey but also installation). |
|
222 |
2015 Jul. 31 |
Y. Aso |
|
Overall design |
The largest concern of survey is lack of human resource. Outsourcing could be a solution (budget is an issue). Yoichi tells this issue to SEO. |
|
223 |
2015 Jul. 31 |
|
|
Overall design |
We must summarize what we must survey (change of whole tunnel should be measured). |
|
224 |
2015 Jul. 31 |
|
|
Overall design |
Requirements and specifications (length, collimation, and so on) of short optical lever for cryo payload should be summarized. |
|
225 |
2015 Aug. 4 |
|
|
Overall design |
Bending length of metal fiber should be checked |
|
226 |
2015 Aug. 4 |
E. Majorana, K. Yamamoto |
|
Overall design |
We measure vibration of radiation shield at KAGRA site (X end, probably, June or July 2016). Ettore said that KAGRA can use Luca’s vertical accelerometer and Luca is interested (He can measure). However, Ettore and Kazuhiro found that sensitivity improvement is necessary (Meas. Sci. Technol. 25 (2014) 015103). Ettore checks noise at cryogenic temperature (electric noise is dominated by thermal noise) and performance at Sardinian mine. Ettore also pointed out that the sensitivity is larger when we increase pump current (in the measurement at Toshiba, this current is as small as possible because they are afraid that current can generate heat). We keep touch and exchange information before we start measurement. |
|
227 |
2015 Aug. 4 |
K. Yamamoto |
|
Overall design |
We measure vibration of radiation shield at KAGRA site (X end, probably, June or July 2016). Kazuhiro will ask Tatsumi-san the status (He has Dan’s horizontal accelerometer now). |
|
228 |
2015 Aug. 11 |
|
|
Sapphire monolithic suspension |
We must decide the distance edges of mirror itself and reflective coating. |
|
229 |
2015 Aug. 11 |
|
|
Overall design |
Ettore proposed particle counter is put in clean booth when somebodies work. It gives much information. |
|
230 |
2015 Aug. 18 |
|
|
Overall design |
We must take care of weight of screws. |
|
231 |
2015 Sep. 8 |
|
|
Overall design |
Preparation of Slow DAQ test at KAGRA site in iKAGRA. CRY intends to check whether DAQ and some thermometers work and joins the preparation of Yoichi and Kazuhiro (H) et al. on next month. CRY must summarize connectors by this preparation. Cables (about 20m length, where they are put (along wall, ceiling, …), ) must be taken care of. |
|
232 |
2015 Sep. 8 |
T. Tomaru |
|
Overall design |
Takayuki asks Osamu to correct schematic view of Slow DAQ later. |
|
233 |
2015 Sep. 8 |
|
|
Overall design |
We can check output of thermometer in cryostats via ICRR VPN. We must investigate how to access from KEK. |
|
234 |
2015 Sep. 8 |
AOS |
|
Overall design |
Torisha will deliver two cryo ducts (for end cryostat on the Beam Reducing Telescope side). The first one will arrive on March and the next one will on April or May. So, the first and second one can be test on middle of February and March (or April), respectively (Inhomogeneous SolBlack could be an issue). AOS consider what point must be checked. |
|
235 |
2015 Sep. 8 |
AOS |
|
Overall design |
AOS checks black coating on low magnetism stainless steel (NSSC-130S from Nippon Steel and Sumitomo Metal). |
|
236 |
2015 Sep. 8 |
T. Miyamoto |
|
Overall design |
Hagiwara-san revised clamp. But so far, bending length of metal wires is not taken into account. Kazuhiro (Y)’s rough evaluation suggest that it could be several mm. Takahiro will check. |
|
237 |
2015 Sep. 8 |
T. Tomaru |
|
Overall design |
In order to reduce weight, the Marionetta looks delicate. So, Takayuki checks how much the first resonant frequency is. |
|
238 |
2015 Sep. 8 |
A. Hagiwara, T. Tomaru |
|
Overall design |
Rahul proposed heavier intermediate mass (to reduce recoil loss). The platform weight could be 60 kg weight. If so, intermediate mass can be heavier. Takayuki and Higiwara-san will check later. |
|
239 |
2015 Sep. 8 |
|
Closed. It is OK if we can adjust the weight of mass within 10% of weight of mass itself (In usual case, about 20kg. So, small masses for adjustment is about 2kg in total.) |
Overall design |
We discuss the small weight for adjustment of weight of each mass. We must consult with VIS. |
|
240 |
2015 Sep. 8 |
|
|
Sapphire monolithic suspension |
Takayuki mentioned that heat extraction test for ACTUAL KAGRA sapphire suspension (otherwise, we cannot know how much mirror temperature is). But it is not easy … We must consider. |
|
241 |
2015 Sep. 15 |
|
|
Overall design |
Sensor and actuator for vertical (and pitch) motion of intermediate mass is considered. |
|
242 |
2015 Sep. 15 |
|
|
Overall design |
VIS discusses whether (or when) they send their drivers and so on to CRY. Ryutaro sends information of details later. |
|
243 |
2015 Oct. 14 |
|
|
Sapphire monolithic suspension |
We must measure thickness of indium (between nail head and blade spring, and between nail head and sapphire hook (ear). |
|
244 |
2015 Oct. 14 |
|
|
Sapphire monolithic suspension |
Oil in micrometers can be an issue (source of contamination (information from VIS)). We must wash or look for vacuum compatible ones. |
|
245 |
2015 Oct. 14 |
|
|
Sapphire monolithic suspension |
Auto collimator must be taken into account. |
|
246 |
2015 Nov. 11 |
R. Kumar |
|
Sapphire monolithic suspension |
Rahul prepares design drawing of jack. |
|
247 |
2015 Dec. 15 |
|
|
Sapphire monolithic suspension |
Investigation of water glass between sapphire blade spring and nail head |
|
248 |
2015 Dec. 24 |
K. Yamamoto |
|
Sapphire monolithic suspension |
Takayuki asked whether we can use clean booth (class 1000) in Advanced measurement experiment building of KEK. Yes, we can. Kazuhiro considers how much area is necessary. |
|
249 |
2015 Dec. 24 |
K. Yamamoto |
Closed. http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=4914 |
Sapphire monolithic suspension |
Four sapphire ears from IMPEX will be delivered tomorrow. Kazuhiro proposed that we ask Ueda-san and Enami-san to measure flatness and geometrical shape and that we provide jig to fix ears for measurement. |
|
250 |
2016 Jan. 13 |
K. Yamamoto |
Closed. ->#259 |
Sapphire monolithic suspension |
The extra pieces of sapphire fibers must be necessary (risks of breaks) and the budget must be considered. |
|
251 |
2016 Jan. 13 |
|
|
Sapphire monolithic suspension |
CRY will ask MIR to measure geometrical shape of sapphire mirror and flatness of flat cut on barrel surface. |
|
252 |
2016 Jan. 13 |
|
|
Control |
Life time (or change of efficiency) of PD and LED must be taken care of. |
|
253 |
2016 Jan. 19 |
R. Kumar |
|
Sapphire monolithic suspension |
Rahul summarizes the list of needed item and quotation about sapphire fiber holder |
|
254 |
2016 Jan. 19 |
T. Tomaru |
|
Control |
Takayuki asks Ryutaro, Yoichi, Osamu, Taknori whether CRY can use digital system of VIS. |
|
255 |
2016 Feb. 2 |
|
|
Overall design |
Takayuki asks Ryutaro, Yoichi, Osamu, Taknori whether CRY can use digital system of VIS. |
|
256 |
2016 Feb. 2 |
|
|
Material |
We must take care of magnetism of Maraging. Takayuki is afraid that magnetism of Maraging causes issue. Tomotada pointed out Ni coating to avoid rust on Maraging dominates magnetism. Takayuki suggests that Cr coating can be better. |
|
257 |
2016 Mar. 1 |
K. Yamamoto |
|
Sapphire monolithic suspension |
Takayuki suggested combination of height gauge and dial gauge (350mm length with 0.01mm precision) in order to measure length of sapphire fiber. Kazuhiro checks. |
|
258 |
2016 Mar. 1 |
K. Yamamoto |
|
Sapphire monolithic suspension |
Kazuhiro must write investigation report to IMPEX carefully as feedback. Result of flatness measurement by IMPEX is not consistent with Ueda-san’s (We can ask third person ?). |
|
259 |
2016 Mar. 1 |
K. Yamamoto |
He asked quotation for 8 fibers and 16 fibers. Quotation is on KEK wiki: Quotation IMP-160316-3-Bars (sapphi.. in http://wiki.kek.jp/pages/viewpage.action?pageId=37159777 |
Sapphire monolithic suspension |
We must purchase extra fibers from IMPEX. Kazuhiro evaluates cost and lead time for discussion. |
|
260 |
2016 Mar. 1 |
K. Craig and K. Yamamoto |
|
Sapphire monolithic suspension |
Assembly of sapphire parts must be tried as soon as possible. |
|
261 |
2016 Mar. 1 |
K. Yamamoto |
|
Sapphire monolithic suspension |
Delivery of ETM (ITM) is on December 2016 (March 2017). Kazuhiro must make plan based on this delivery. |
|
262 |
2016 Mar. 8 |
R. Kumar |
|
Sapphire monolithic suspension |
Rahul is preparing document about assembly of sapphire suspension. |
|
263 |
2016 Mar. 8 |
R. Kumar |
|
Control |
Rahul is checking papers about AdLIGO control and damping system. |
|
264 |
2016 Apr. 13 |
K. Yamamoto |
Kazuhiro visited NAOJ and found some parts must be ordered or he asks mechanical workshop.->Kazuhiro visited Rome on 20th of May. Luca, Ettore and Kazuhiro discussed. They will install accelerometers on autumn at a cryostat in the center room. In this case, measurement is after autumn. However, they prepare everything by end of July. |
Overall design |
Kazuhiro is charge of measurement of vibration in radiation shield in summer 2016. He contacts Ettore, Luca, and Tatsumi-san to check status of accelerometers. |
|
265 |
2016 Apr. 13 |
R. Kumar |
|
Vertical spring |
Rahul shows simulation result for vertical spring in platform in the next meeting. |
|
266 |
2016 Apr. 13 |
K. Yamamoto |
Closed. He did it. |
Sapphire monolithic suspension |
Kazuhiro will send information for specification list (flatness, report about flatness measurement) to Shinkosha for procurement in fiscal year 2016. |
|
267 |
2016 Apr. 13 |
K. Yamamoto |
IMPEX replied it is difficult to polish bonding surface with such large slits. So we order exactly same one as those in the last fiscal year. |
Sapphire monolithic suspension |
It is better that slits of sapphire ears is large (about 7mm) for future improvement (thicker fiber can be used). Kazuhiro asks IMPEX quotation for ears with wide slits and whether they can make enhance with of slits in delivered ears. Takayuki asks Shinkosha whether they can make such ears and quotation. |
|
268 |
2016 Apr. 13 |
K. Yamamoto |
|
Sapphire monolithic suspension |
Kazuhiro will measure vibration in shield of middle size cryocooler at Kashiwa. |
|
269 |
2016 Apr. 19 |
K. Yamamoto |
Closed. Unfortunately, KEK clean booth introduced by Takayuki (ISO 6 at most) is not enough for bonding. Virgo clean booth is ISO3. LIGO has ISO 1 booth in ISO 2 or 3 booth. ->#271 |
Overall design |
We must check cleanness of LIGO and Virgo. |
|
270 |
2016 Apr. 26 |
|
Closed. Marielle can stay one week. |
Sapphire monolithic suspension |
Kieran and Kazuhiro check whether somebodies who are familiar with Hydroxide Catalysis Bonding in Glasgow can join ear attachment in July. |
|
271 |
2016 Apr. 26 |
|
|
Overall design |
We look for clean booth (ISO 1-3) for Hydroxide Catalysis Bonding. |
|
272 |
2016 May 10 |
T. Tomaru |
|
Overall design |
Clamp for metal wires: Contact point (or area) between wire and mass is an issue. If it is too wide, contact point is not defined sharply and it could imply low Q-values. If it is too narrow, wire could be broken. Takayuki asks Mark details of clamp in AdLIGO. |
|
273 |
2016 May 10 |
T. Tomaru |
|
Overall design |
Takayuki will check how to fix cables in payload (he asks VIS). |
|
274 |
2016 May 10 |
|
|
Material |
Since low magnetism stainless steel is too hard, VIC applied heat treatment before processing of recoil mass. We must check effect of this heat treatment. VIC have plan to heat metal for other customers. Small sample from us can put in furnace at same time. |
|
275 |
2016 Jun.7 |
|
|
Overall design |
If somebody has idea of experiment in cooling test of KAGRA cryostat at site, please announce as soon as possible. |
|
276 |
2016 Jun.7 |
|
|
Sapphire monolithic suspension |
We must consider how to check whether indium is melted or not carefully. |
|
277 |
2016 Jun.7 |
R. Kumar |
|
Material |
Stress by 1/300 gradient in metal wire must be checked. |
|
278 |
2016 Jun.7 |
K. Craig |
|
Sapphire monolithic suspension |
We might use Romer arm in LIGO to measure 3 dimensional shape. Kieran asks Norna. |
|
279 |
2016 Jun.7 |
K. Yamamoto |
|
Sapphire monolithic suspension |
NAOJ has also clean room. Kazuhiro will ask whether we can use for Hydroxide Catalysis Bonding. |
|
280 |
2016 Jun.7 |
K. Yamamoto |
|
Sapphire monolithic suspension |
Kazuhiro also make list for necessary items for Hydroxide Catalysis Bonding in this week. |
|
281 |
2016 Jun.7 |
|
|
Sapphire monolithic suspension |
We must take care of design of fiber installation jig and earthquake stopper (confliction must be avoided). |
|
282 |
2016 Jun.7 |
|
|
Sapphire monolithic suspension |
After long discussion for Hydroxide Catalysis Bonding, Takayuki is charge of (discussion with MIR); Jig to lift up mirror, HCB at LMA, 3-dimention measurement tools. |
|
283 |
2016 Jun.7 |
|
|
Sapphire monolithic suspension |
We must consider how to wash and rinse flat cut (before or after mirror is installed in box) ? |
|
284 |
2016 Jun.13 |
|
|
Sapphire monolithic suspension |
Procedure of the mirror installation into Perugia box. How to rotate mirror in box precisely ? |
|
285 |
2016 Jun.13 |
|
|
Sapphire monolithic suspension |
Ear position measurement after bonding is an issue. How to measure in CLEAN CONDITION ? 3 dimension measurement arm at KAGRA site can be useful. |
|
286 |
2016 Jun.13 |
|
Tomotada Akutsu would like to know how to fix window on shield (we must ask Toshiba), tolerance of window (diameter and thickness, Kimura-san checks quotation). |
Overall design |
Design with tolerance of windows and clamp parts in cryostat for optical levers will be sent to AOS. |
|
287 |
2016 Jun.13 |
|
|
Sapphire monolithic suspension |
We must consider reference and monitor system for 1/300 gradient. In the process of assembly this tilt is changed. |
|
288 |
2016 Jun.13 |
|
|
Material |
Wire under recoil mass. Because of holes at lower parts of recoil mass, wire has stress ends of hole. |
|
289 |
2016 Jun.13 |
|
|
Sapphire monolithic suspension |
Rahul explained strength test of ear-mirror bonding in AdVirgo (He learned at Perugia from Helios) with spring. After one month curing, mirror with ears is put on jig and they wait 10 days. If nothing happens, it is OK (and nothing happened so far). |
|
289 |
2016 Jul.5 |
|
|
Overall design |
Kieran (Rahul) leaves Japan on July (October) of 2017. We must consider how to take over. |
|
290 |
2016 Jul.12 |
|
|
Overall design |
VIS prepares items to catch dropping something. |
|