5239
Comment:
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22415
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Deletions are marked like this. | Additions are marked like this. |
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'''[[KAGRA/Subgroups/CRY| back to CRY top]]''' | '''[[KAGRA/Subgroups/CRY/CRYpmeeting| back to Cryopayload Meeting]]''' |
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|| 002 || 2013 Nov. 19 || R. Takahashi ||<#ff0000> Urgent! He has already asked, but no reply so far. If he will not receive anything by the next meeting, we must make drawings by ourselves (we copy Type B design and rewrite and so on).|| Overall design || 3-D design drawing of Type-A is necessary (ASAP!). Ask to Gianni. ||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|| |
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|| 004 || 2013 Nov. 19 || K. Yamamoto ||<#ff0000> Urgent! (1)Eric is busy. Kazuhiro will ask again to send Eric’s file to Kazuhiro. Eric stays in Japan on the next week. Kazuhiro also will ask Yoichi Aso whether he can with COMSOL. (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|| | || 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|| |
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|| 008 || 2013 Nov. 19 || K. Yamamoto ||<#ff0000> Urgent! By the beginning of the next week, Kazuhiro must tell Ryutaro how many he orders (Kazuhiro must take extra pieces into account).||Control|| About the procurement of the OSEMs, K. Yamamoto will consult R. Takahashi. ||2013 Nov. 26|| || 009 || 2013 Nov. 19 || T. Suzuki ||<#ff0000> Urgent! He asked Kimura-san, but no reply so far. The cryogenic test is necessary. (Thrust bearing is about 50mm in diameter and 300kg load).||Control|| Check whether the thrust bearing can work at the cryogenic temperature. ||2013 Nov. 26|| || 010 || 2013 Nov. 19 || D. Chen (?) ||<#ff0000> Urgent!(i)In order to fix LED and PD, PCB is used. We must check PCB is OK at low temperature. (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 ||<#ff0000> Urgent!||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 ||<#ff0000> Urgent!||Vertical spring||Kazuhiro rewrites schedule.||2013 Dec. 3|| || 013 || 2013 Nov. 26 || K. Yamamoto ||<#ff0000> Urgent!||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 ||<#ff0000> Urgent!||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 ||<#ff0000> Urgent!||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|| '''[[KAGRA/Subgroups/CRY| back to CRY top]]''' |
|| 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.[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2026|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 ||<#ff0000> Urgent! He rewrote, but again, he must do so. First of all, strategy must be fixed. ||Vertical spring||Kazuhiro rewrites schedule.||2013 Dec. 3|| || 013 || 2013 Nov. 26 || K. Yamamoto ||Closed. He explained. [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2029|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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2073|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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2106|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. [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|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 ||<#ff0000> Urgent! ||Control||Ryutaro will consult Saito-san on the outgas of circuit board for OSEM. |||| || 020 || 2013 Dec. 3 || K. Yamamoto ||<#ff0000> 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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|payload strategy(in Japanese)]]. Takanori calculated thermal noise of violin modes of heat link. Unfortunately, it is quite high [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2131|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 ||T. Akutsu ||<#ff0000> ||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 …|| || || 024 || 2013 Dec. 10 || Y. Aso, E. Hirose ||<#ff0000> 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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2075|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 ||<#ff0000> Urgent! ||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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2076|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 || ||<#ff0000> 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 || ||<#ff0000> Urgent! Kazuhiro consults with Ettore.||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. [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2074|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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2063|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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2077|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. [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2106|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 ||<#ff0000> Urgent! Kazuhiro collected information, but did not summarize yet.||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 ||<#ff0000> Urgent! Suzuki-san will reserve the out gas measurement system at KEK. 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 compatible[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2101|Out 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 ||<#ff0000> ||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 ||<#ff0000> Urgent! Kazuhiro assigned to Dan.||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 ||<#ff0000> Urgent! ||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 ||<#ff0000> Urgent! ||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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2160|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 ||<#ff0000> ||Sapphire monolithic suspension||Rahul investigates thermal distribution model.|| || || 054 || 2014 Jan. 14 ||Y. Sakakibara ||<#ff0000>Unfortunately, annealing does not change the conductivity of copper. We must check whether size effect limits the conductivity or not. ||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 ||D. Chen, K. Yamamoto ||<#ff0000> Urgent !||Control||We must decide strategy and schedule for LVDT|| || || 057 || 2014 Jan. 14 ||D. Chen, K. Yamamoto ||<#ff0000> 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 ||<#ff0000>Urgent ! ||Sapphire monolithic suspension||Yusuke prepares the document of plan for test of "cradle" sapphire suspension with screws|| || || 061 || 2014 Jan. 28 ||T. Tomaru ||<#ff0000> ||Overall design||Takayuki asks CAD specialists to design of cryo duct above radiation shield.|| || || 062 || 2014 Jan. 28 ||T. Suzuki ||<#ff0000> ||Control||Suzuki-san orders ceramic bearing for test.|| || || 063 || 2014 Jan. 28 ||T. Tomaru ||<#ff0000> ||Overall design||Takayki 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 ||<#ff0000> ||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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1949|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 ||<#ff0000> ||Control||Kazuhiro Yamamoto summarizes the effect of local Earth magnetic field fluctuation on coil magnet actuator and requirement for magnetic field.|| || || 070 || 2014 Feb. 4 ||K. Yamamoto ||<#ff0000>||Control||Kazuhiro investigates the diffraction loss by coil.|| || || 071 || 2014 Feb. 18 ||C. Tokoku ||<#ff0000>||Material||Tokoku-san summarizes measurement of magnetism of stainless (316L ) and Solblack.|| || || 072 || 2014 Feb. 18 ||T. Tomaru ||<#ff0000>||Overall design||Takayuki prepares 3 dimensional CAD drawing in radiation shield.||2014 Feb. 25 || '''[[KAGRA/Subgroups/CRY/CRYpmeeting| back to Cryopayload Meeting]]''' |
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 |
Urgent! He rewrote, but again, he must do so. First of all, strategy must be fixed. |
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 |
T. Akutsu |
|
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 … |
|
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 |
Urgent! |
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 |
|
Urgent! Kazuhiro consults with Ettore. |
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 |
Urgent! Kazuhiro collected information, but did not summarize yet. |
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 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 |
Urgent! Kazuhiro assigned to Dan. |
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 |
Urgent! |
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 |
Urgent! |
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 |
Unfortunately, annealing does not change the conductivity of copper. We must check whether size effect limits the conductivity or not. |
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 |
D. Chen, K. Yamamoto |
Urgent ! |
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 |
Urgent ! |
Sapphire monolithic suspension |
Yusuke prepares the document of plan for test of "cradle" sapphire suspension with screws |
|
061 |
2014 Jan. 28 |
T. Tomaru |
|
Overall design |
Takayuki asks CAD specialists to design of cryo duct above radiation shield. |
|
062 |
2014 Jan. 28 |
T. Suzuki |
|
Control |
Suzuki-san orders ceramic bearing for test. |
|
063 |
2014 Jan. 28 |
T. Tomaru |
|
Overall design |
Takayki 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 |
|
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 |
|
Control |
Kazuhiro Yamamoto summarizes the effect of local Earth magnetic field fluctuation on coil magnet actuator and requirement for magnetic field. |
|
070 |
2014 Feb. 4 |
K. Yamamoto |
Control |
Kazuhiro investigates the diffraction loss by coil. |
|
|
071 |
2014 Feb. 18 |
C. Tokoku |
Material |
Tokoku-san summarizes measurement of magnetism of stainless (316L ) and Solblack. |
|
|
072 |
2014 Feb. 18 |
T. Tomaru |
Overall design |
Takayuki prepares 3 dimensional CAD drawing in radiation shield. |
2014 Feb. 25 |