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'''[[KAGRA/Subgroups/CRY| back to CRY top]]''' | '''[[KAGRA/Subgroups/CRY/CRYpmeeting| back to Cryopayload Meeting]]''' |
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|| 009 || 2013 Nov. 19 || T. Suzuki ||<#ff0000> Urgent! In KEK, thrust bearing without grease was checked. Suzuki-san will ask the load and speed and so on. 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|| | || 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|| |
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|| 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)]]||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 ||<#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|| || 016 || 2013 Dec. 3 || R. Takahashi, E. Hirose ||<#ff0000> Urgent! ||Overall design||Type A 3 dimension drawing. 2 dimensional design drawing (cut and copy of Type B design and so on)|||| || 017 || 2013 Dec. 3 || R. Takahashi, H. Ishizaki, T. Sekiguchi ||<#ff0000> Urgent! ||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 ||<#ff0000> Urgent! ||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 board for OSEM. |||| '''[[KAGRA/Subgroups/CRY| back to CRY top]]''' |
|| 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 ||Closed. (#105) ||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 … We must consider the structure between baffle and hole for laser beam on radiation shield.|| || || 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 ||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 [[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 || || 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. [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|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. [[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 ||Closed. Kazuhiro summarizes what happened in CLIO and his guess about what happens in KAGRA [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|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 ||<#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 ||Closed. Dan explained his results.[[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2222|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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|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 [[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 ||T. Sekiguchi ||<#ff0000> 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 ||<#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 ||Closed. Minute is here [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2334|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 ||<#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 ||Closed.22nd and 23rd page of [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|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 ||<#ff0000>||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 ||<#ff0000>||Overall design||Suzuki-san discusses protection strategy for mirror and shield in SEO meeting.|| || || 075 || 2014 Feb. 25|| ||<#ff0000>||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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2259|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|| ||<#ff0000>||Sapphire monolithic suspension||Details of strength test of sapphire blade spring are considered (also clamp).|| || || 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|| ||<#ff0000>||Overall design||Vertical drift by thermal shrink|| || || 087 || 2014 Mar. 8|| ||<#ff0000>||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 ||<#ff0000>||Overall design||Takayuki prepares "necessary item" list in wiki. If somebody finds something necessary, s/he writes it.|| || || 089 || 2014 Mar. 11||T. Tomaru ||<#ff0000>He and Suzuki-san has kick off meeting with Mitaka-koki.||Overall design||Takayuki looks for company for mechanical manufacture.|| || || 090 || 2014 Mar. 11||T. Suzuki, T. Tomaru ||<#ff0000>||Overall design||Suzuki-san and Takayuki prepare the flange at the top of cryostat to separate cryostat from room temperature part.|| || || 091 || 2014 Mar. 11||K. Yamamoto ||<#ff0000>||Material||Kazuhiro Yamamoto summarizes the requirement of magnetism.|| || || 092 || 2014 Mar. 11||T. Tomaru ||<#ff0000>||Material||Takayuki investigates how to anneal tungsten.|| || || 093 || 2014 Mar. 11||Y. Sakakibara ||<#ff0000>||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)||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 ||<#ff0000>||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 ||<#ff0000>||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 ||<#ff0000>||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||K. Yamamoto ||<#ff0000>||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 [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|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||T. Sekiguchi ||<#ff0000>||Overall design||Takanori summarizes the requirement of optical lever and so on.|| || || 103 || 2014 Apr. 30||T. Tomaru and K. Yamamoto ||<#ff0000>||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 ||<#ff0000>||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, K. Yamamoto ||<#ff0000>||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 ||<#ff0000>||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 ||<#ff0000>||Vertical spring||They prepare to move a tank of liquid nitrogen to ICRR.|| || ||<#ff0000> 109 || 2014 Apr. 30||D. Chen, R. Kumar, K. Yamamoto ||<#ff0000>In progress. [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2381|Bending length of thick fibers]]||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 ||<#ff0000>||Sapphire monolithic suspension||Rahul or Dan calculate the violin modes with blade spring.|| || || 111 || 2014 Apr. 30||K. Yamamoto ||<#ff0000>||Material||Kazuhiro Yamamoto check the effect of weight of heat link. For example, their weight can stretch the vertical spring.|| || ||<#ff0000> 112 || 2014 Apr. 30||K. Yamamoto ||Closed. [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|Cryogenic payload requirement]](English).||Overall design||Kazuhiro summarize memo [[http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=1861|Cryogenic payload strategy]](Japanese). He add figure to show requirements of each part in cryo payload.|| || '''[[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 |
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 |
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 … We must consider the structure between baffle and hole for laser beam on radiation shield. |
|
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 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 |
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 |
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 |
|
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 |
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 |
|
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). |
|
|
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 |
|
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 |
Overall design |
Takayuki prepares "necessary item" list in wiki. If somebody finds something necessary, s/he writes it. |
|
|
089 |
2014 Mar. 11 |
T. Tomaru |
He and Suzuki-san has kick off meeting with Mitaka-koki. |
Overall design |
Takayuki looks for company for mechanical manufacture. |
|
090 |
2014 Mar. 11 |
T. Suzuki, T. Tomaru |
Overall design |
Suzuki-san and Takayuki prepare the flange at the top of cryostat to separate cryostat from room temperature part. |
|
|
091 |
2014 Mar. 11 |
K. Yamamoto |
Material |
Kazuhiro Yamamoto summarizes the requirement of magnetism. |
|
|
092 |
2014 Mar. 11 |
T. Tomaru |
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) |
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 |
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 |
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 |
K. Yamamoto |
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 |
T. Sekiguchi |
Overall design |
Takanori summarizes the requirement of optical lever and so on. |
|
|
103 |
2014 Apr. 30 |
T. Tomaru and K. Yamamoto |
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, K. Yamamoto |
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 |
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 |
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 |
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. |
|