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Kazuhiro Yamamoto Institute for Cosmic Ray Research (ICRR) the University of Tokyo

Cryogenic sub group. Kazuhiro Yamamoto Institute for Cosmic Ray Research (ICRR) the University of Tokyo KAGRA face to face meeting University of Toyama, Toyama, Japan 1 August 2014. Contribution. R. Takahashi A , H. Tabaka, T. Miyamoto, K. Ono, T. Sekiguchi,

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Kazuhiro Yamamoto Institute for Cosmic Ray Research (ICRR) the University of Tokyo

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  1. Cryogenic sub group Kazuhiro Yamamoto Institute for Cosmic Ray Research (ICRR) the University of Tokyo KAGRA face to face meeting University of Toyama, Toyama, Japan 1 August 2014

  2. Contribution R. TakahashiA, H. Tabaka, T. Miyamoto, K. Ono, T. Sekiguchi, Y. Sakakibara, C. Tokoku, M. Kamiizumi, U. Iwasaki, E. Hirose, A. Khalaidovski, R. Kumar, T. Uchiyama, S. Miyoki, M. Ohashi, K. Kuroda, T. AkutsuA, H. IshizakiA, F. E. Peña ArellanoA, T. SuzukiB, T. TomaruB, N. KimuraB, S. KoikeB, T. KumeB, ToyodaB, MurakamiB, TerashimaB, HagiwaraB, K. TsubonoC, Y. AsoC, T. UshibaC, K. ShibataC, D. ChenD, N. OhmaeE, K. SomiyaF, R. DeSalvoG, E. MajoranaH, L. NaticchioniH, W. JohnsonI, A. CummingJ, R. DouglasJ, K. HaughianJ, I. MartinJ, P. MurrayJ, G. HammondJ, S. RowanJ ,G. HofmannK, C. SchwarzK, D. HeinertK, R. NawrodtK, S. GotoL, M. TanakaL, S. IokaM, K. NakamotoM, H. NezukaM, KAGRA collaboration ICRR.UT, NAOJA, KEKB, Phys.S.UTC, Astro.S.UTD, E.UTE,S.TITF, Sannio Univ.G, INFNH, Louisiana State Univ.I , University of GlasgowJ, Friedrich-Schiller-Universitaet JenaK, Jecc TorishaL, Toshiba Keihin Product OperationsM, KAGRA collaboration

  3. 0. Abstract Although there are many topics, here, I will explain recent progress and status of (1)Cryostat (2)Payload (3)Human resources. Yusuke explains cryo duct after my talk.

  4. Contents • Introduction • Cryostat • Payload • Human resources • Summary

  5. 1. Introduction Schematic view of KAGRA interferometer Four mirrors of arm cavity will be cooled. 3km 3km Mozumi Y-end Sakonishi X-end Kamioka mine (Underground site) Atotsu Center Vibration isolation system, Cryocooler unit, Cryostat, Cryogenic payload 5 5 5 5

  6. 1. Introduction Outline of vibration isolation and cryostat 14 m 6

  7. 1. Introduction Outline of vibration isolation and cryostat 14 m Vibration Isolation Cryogenic mirror Cryostat 7

  8. 1. Introduction Outline of cryostat to SAS Cryogenic payload Cryostat Stainless steel t20mm Diameter 2.6m Height ~3.6m M ~ 10 ton Mirror View ports 4 Low vibration cryocooler unit Cryo-coolers Pulse tube, 60Hz 0.9 W at 4K (2nd) 36 W at 50K (1st) Remote valve unit Main LASER beam S. Koike

  9. 1. Introduction Vacuum chamber (300K) Inner shield (8K) Outer shield (80K) Pulse tube cryocoolers 2 Pulse tube cryocoolers 2 Pulse tube cryocoolers BafflesCryo duct(Yusuke’s talk) 9 9 9 9

  10. 1. Introduction Heat link (pure Al) Heat link (pure Al) Pulse tube cryocoolers Pulse tube cryocoolers Sapphire fiber Sapphire mirror (About 20K) Pulse tube cryocoolers 10 10 10 10

  11. 2. Cryostat One year ago, the cryostats were moved to the warehouse near Kamioka. 11

  12. 2. Cryostat First cryostat will be moved to end of Y arm on the 12th-13th of August ! It will be fixed after 19th of Aug. 12

  13. 2. Cryostat Hole on radiation shield for wire from SAS . Duct to reduce radiation invasion is necessary. BafflesCryo duct(Yusuke’s talk) 13 13 13 13 13 13 13 13 13 13

  14. 2. Cryostat Design is fixed. It is being manufactured in Mechanical Engineering Center of KEK. Duct for SAS Ceiling of radiation shield 14 14 14 14 14

  15. 3. Payload Main strategy of cryo payload One payload in Fiscal year 2014 (by March 2015). Design drawing Hagiwara-san (CAD operator in KEK) and Koike-san (Engineer in KEK) proceed (based on Type B payload design). 15 15 15 15 15

  16. 3. Payload Manufacturing factory We are looking for factories and found three candidates. Mechanical Engineering Center of KEK also can support. 16 16 16 16 16

  17. 3. Payload Sapphire suspension Preparation for (similar size) prototype of lop ear is in progress. We fixed design ear and cut on mirror and ask quotation. Dummy bulk (Shinkosha) 17 17 17 17 17

  18. 3. Payload Sapphire suspension Paper about thermal conductivity measurement sapphire fibers with nail heads was accepted !

  19. 3. Payload Sapphire suspension Bonding technique is necessary. Two kinds of bonding (Both of them are necessary) Hydroxide Catalysis Bonding Indium Thermal resistance and mechanical dissipation must be measured. 19 19 19 19 19

  20. 3. Payload Sapphire suspension Thermal resistance of bonding (Dan, GWADW2014) Preliminary Probably, it is OK, but Dan proceeds …. 20 20 20 20 20

  21. 3. Payload Sapphire suspension Mechanical loss of indium (Dan in Jena) 21 21 21 21 21

  22. 3. Payload Sapphire suspension Mechanical loss of indium (Dan in Jena) Investigation is in progress … 22 22 22 22 22

  23. 3. Payload Sapphire suspension Dan and Rahul proceeds with calculation of thermal noise using Finite Element Method. The result is coming soon. 23 23 23 23 23

  24. 3. Payload CuBe blade spring in platform Platform includes CuBe spring for vertical vibration isolation. Intermediate Recoil Mass Intermediate Mass Test Mass (sapphire mirror) Recoil Mass 24 24 24 24 24

  25. 3. Payload CuBe blade spring in platform Small CuBe sample to check material properties in KEK (1)Q-value (2)Temperature coefficient of Young’s modulus Fabrication for measurement was finished. We are preparing samples. 25 25 25 25 25

  26. 3. Payload CuBe blade spring in platform Large CuBe blade spring (provided by VIS group) in 1/4 cryostat in ICRR. They will be moved to KEK on the 8th of Aug. 26 26 26 26 26

  27. 3. Payload Moving mass to adjust angle of platform and intermediate mass Cryogenic test in KEK will start soon. Intermediate Mass Test Mass (sapphire mirror) 27 27 27 27 27 27 27 27 27 27 27

  28. 4. Human resources Fresh persons Research staff Tatsuya Kume : Lecturer (KEK) Vibration measurement, Cryo duct New a few project assistant professors (ICRR) for cryogenic payload, cryogenic mirror and so on They will start to work on the beginning of 2015 in the earliest case. 28 28 28 28 28

  29. 4. Human resources Fresh persons Graduate students (Master course) T. Miyamoto, H. Tanaka Technical staff Toyoda : Support for cryogenic experiment and Design drawing Terashima : Technician (Machining) Murakami : Technician (Welding) Hagiwara : CAD operator 29 29 29 29 29

  30. 4. Human resources ELiTES: ET-LCGT interferometric Telescope Exchange of Scientists Grant for collaboration aboutcryogenic between KAGRA and ET European 7th Framework Programme Marie Curie action (Mar. 2012 - Feb. 2016) European people can visit Japan for KAGRA. In the first half year of 2014, 22 guests came ! 30

  31. 5. Summary Cryostat First and second cryostats will be installed at Y end of KAGRA site on August , respectively. Cryo duct Yusuke reports soon ! Payload One payload by March 2015 Design and search for factories are in progress. Prototype of sapphire suspension is being prepared.

  32. 5. Summary Payload Dan Proceeds with experiment for sapphire boding techniques. KEK proceeds with various tests (CuBe spring, moving mass ....) Fresh persons 1 lecturer, 2 graduate student (master course), 3 technical staffs New project assitant professors come at the January 2015.

  33. Thank you for your attention !

  34. Sapphire suspension Q of square nail head 34 34 34 34 34

  35. One fiber prototype 35 35 35 35 35

  36. 7. For future Some items for future research (not perfect list) (a)Investigation material properties (Q, thermal conductivity, strength etc.) of coating, fiber and so on. (b)Sapphire bonding, Sapphire fiber clamp (c)Control and damping scheme Actuators and sensors at cryogenic temperature (d) Mechanical and thermal simulation for payload (e) Vertical spring in cryostat (f) Reduction of initial cooling time Thermal resistance of clamp .... (g) Baffles for scattered light in radiation shield (h) Assembly procedure 36

  37. 8. Summary Cryostat : Assembly is in progress. Cooling test is coming soon. Cryogenic duct : Optimum position of 5 buffles Future work : scattered light Cryocooler unit : Cooling test and vibration measurement : OK Cryogenic payload Preparation for 1/4 cryostat to check payload performance is in progress. Current main R&D topics Inital cooling time, Sapphire fiber with nail head, Coating mechanical loss, Vibration of shield

  38. 2. Issues (1)How to assemble Details of construction, clean room …. (2)Strength Tensile strength, development of clamp, sapphire bonding … (3)Control and damping system to reduce fluctuation and instability Actuators (what and where), resonant mode (frequency and Q) and so on

  39. 2. Issues (4)Cooling Temperature of mirror (below 20 K), initial cooling time, heat resistance of clamp … (5)Noise Thermal noise, vibration via vibration isolation system and heat links …

  40. 4. Sapphire fibers After Yusuke left …. Clamp for IMPEX fibers in Jena

  41. 4. Sapphire fibers Profile measurement in Glasgow

  42. 5. Sapphire suspension Sapphire fibers with nail heads Q measurement in Jena

  43. Vacuum chamber (300K) Outline of vibration isolation and cryostat Inner shield (8K) Outer shield (80K) Pulse tube cryocoolers 2 Pulse tube cryocoolers 2 Pulse tube cryocoolers Baffles Cryoduct 43 43 43 43 43 43

  44. 3. Payload Sapphire suspension Mechanical loss of indium (Dan in Jena) Preliminary Loss angle 44 44 44 44 44

  45. 3. Payload Sapphire suspension Dan’s calculation Dan and Rahul proceeds with calculation of thermal noise using Finite Element Method. The result is coming soon. Preliminary 45 45 45 45 45

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