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K. Yamamoto , R. Takahashi, T. Sekiguchi, Y. Sakakibara, C. Tokoku,

Development of vibration isolation systems for LCGT VII. K. Yamamoto , R. Takahashi, T. Sekiguchi, Y. Sakakibara, C. Tokoku, M. Kamiizumi, U. Iwasaki, T. Uchiyama, S. Miyoki, M. Ohashi, T. Akutsu A , H. Ishizaki A , D. Chen A , A. Takamori B , T. Suzuki C , N. Kimura C , S. Koike C ,

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K. Yamamoto , R. Takahashi, T. Sekiguchi, Y. Sakakibara, C. Tokoku,

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  1. Development of vibration isolation systems for LCGT VII K. Yamamoto, R. Takahashi, T. Sekiguchi, Y. Sakakibara, C. Tokoku, M. Kamiizumi, U. Iwasaki, T. Uchiyama, S. Miyoki, M. Ohashi, T. AkutsuA, H. IshizakiA, D. ChenA, A. TakamoriB, T. SuzukiC, N. KimuraC, S. KoikeC, K. TsubonoD, Y. AsoD, T. UshibaD, K. ShibataD, N. OhmaeE, K. SomiyaF, R. DeSalvoG, E. MajoranaH, E. HennesI, J. Van den BrandI, A. BertoliniIJ, N.A. LockerbieK, LCGT collaboration ICRR.UT, NAOJA,ERI.UTB, KEKC, Phys.S.UTD, E.UTE, S.TITF, Sannio UnivG., INFNH, NikefI, AEIJ, University of StrathclydeK 2012 March 24 The meeting of Physical Society of Japan @Kwansei Gakuin University, Nishinomiya, Hyogo

  2. 0. Abstract Progress of development of vibration isolation system, which includes cryogenic payload, for KAGRA in the last half year

  3. Contents • Introduction • Vibration isolation • Cryogenic payload • Summary

  4. 1. Introduction KAGRA (old name: LCGT) 2nd generation interferometric gravitational wave detector in Japan Key features of KAGRA project Silent underground site (Kamioka) : Small seismic motion Vibration isolation system is necessary. Cryogenic system : Reduction of thermal noise and so on

  5. 1. Introduction Type-A IP + GASF (5 stage) + Payload (23kg, cryogenic) Type-B IP + GASF (3 stage) + Payload (10kg/20kg) Type-C Stack + Single/Double-pendulum (～1kg)

  6. 1. Introduction Type-C Stack Mirror

  7. Type-B Top filter [Filter0] Pre-isolator Inverted Pendulum (IP) Filter chain Filter1 (Filter1~3 in Type-A) Bottom Filter (BF) Intermediate Mass (IM) Intermediate Recoil Mass (IRM) Payload Test Mass(TM) Recoil Mass (RM) Optical Bench [Breadboard]

  8. 1. Introduction Type A and Cryo payload 14m Vibration Isolation (Type A) Cryostat Cryogenic mirror 8

  9. 1. Introduction Cryo payload Shield (8K) Sapphire fiber Sapphire mirror (20K)

  10. 1. Introduction Schedule for vibration isolation system of KAGRA iKAGRA (room temperature) - 2015.12 bKAGRA (cryogenic temperature) 2016.1 - Prototype test (ICRR and NAOJ) : - 2014.3 Pre-isolator : 2011.7 – 2012.9 Type B payload : 2012.7 - 2013.6 Type B : 2013.1 - 2014.3 Assembling (Akeno and Kamioka) : 2012.4 - 2014.9 Standard GASF : 2012.4 – 2012.9 Installation (Kamioka) : 2014.4 - 2016.5 Type B (for iKAGRA) : 2014.4 - 2015.6 Type A and Type B (for bKAGRA) : 2015.5 - 2016.5

  11. 1. Introduction Schedule for cryogenic payload of KAGRA iKAGRA (room temperature) - 2015.12 bKAGRA (cryogenic temperature) 2016.1 - 1/4 cryostat and R&D : - 2014.9 Design for cryostat and payload : Now Cryostat installation in ICRR (Kashiwa) : 2013.3 Experiment of 1/4 cryostat : 2013.4 - 2014.9 Procurement : 2014.10 - 2015.6 Installation : 2015.8 - 2016.12

  12. 2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR) Total system

  13. 2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR) Pre-isolator

  14. 2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR) Load for pre-isolator

  15. 2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR) Standard GASF (prototype)

  16. 2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR) Digital system has already been installed (O. Miyakawa’s talk in this session). Details of experimental test will be reported by T. Sekiguchi (next talk !).

  17. 2. Vibration isolation Storage & Assembling • Delivered apparatus will be assembled in clean booths and stored in Akeno observatory (ICRR), Yamanashi.

  18. 2. Vibration isolation • 19 standard GASF’s • from Italy and clean booths arrived. • We will start assembling soon.

  19. 3. Cryogenic payload Preparation for 1/4 cryostat Design of 1/4 cryostat is in progress. This is NOT FINAL version. 19

  20. 3. Cryogenic payload Preparation for 1/4 cryostat Design of cryogenic payload is in progress. This is NOT FINAL version. 20 http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=570

  21. 3. Cryogenic payload Preparation for 1/4 cryostat Themal and mechanical simulation of payload (S. Koike and T. Sekiguchi) 21

  22. 3. Cryogenic payload Preparation for 1/4 cryostat (C. Tokoku) Cryocoolerhas already arrived at ICRR ! 22

  23. 3. Cryogenic payload Sapphire fibers to suspend sapphire mirrors

  24. 3. Cryogenic payload Sapphire fibers to suspend sapphire mirrors Test sample (T. Uchiyama)

  25. 3. Cryogenic payload Sapphire fibers to suspend sapphire mirrors Sapphire fibers from MolTech GmbH (Germany) Thier length (350 mm) and diameter (1.8 mm) are almost same as what we will need in bKAGURA. We should check the quality. 25

  26. 3. Cryogenic payload Baffle for the (large angle) scattered light Mike Smith (Caltech, the support of LIGO and the U.S. National Science Foundation ) How will it be suspended in radiation shield ?

  27. 3. Cryogenic payload Digital system for temperature monitor Discussion is in progress.

  28. 4. Summary Vibration isolation Prototype test in Kashiwa : pre-isolator (Sekiguchi and Miyakawa talk) Assembling of Standard GASF in Akeno is started soon. Cryogenics payload Design of the 1/4 cryostat and payload are in progress. Cryocooler for 1/4 cryostat and test samples of sapphire fibers arrived. Discussion for baffle in cryostat and digital system are being discussed.

  29. Thank you for your attention !

  30. 4. Summary Plan for next half year Vibration isolation Prototype test : pre-isolator and payload Assembling in Akeno : Standard GASF Cryogenics payload Design of the 1/4 cryostat and payload

  31. 2. Issues (1)How to assemble Details of construction, clean room …. (2)Strength Tensile strength, development of clamp, … (3)Control system Actuators (what and where), resonant mode (frequency and Q)

  32. 2. Issues (4)Cooling Temperature of mirror, initial cooling time, heat resistance … (5)Noise Thermal noise, vibration via heat links …

  33. 4. Summary Cryogenic payload : One of key features of LCGT project Cryogenic part of seismic isolation system Cryostat installation in ICRR (Kashiwa) ~2013.3 (Check of cryostat system) Check of cryogenic payload in ICRR Preparation is in progress. (1)Thermal simulation (2)Sapphire fiber-mirror connection (3)Simulation of effect of external vibration (with heat link) (4)Thermal noise

  34. 5. Future work (1)How to assemble Details of construction, clean room …. (2)Control system Actuators (what and where), resonant mode (frequency and Q)

  35. Type-B Inverted pendulum Top filter 2-stage GASF Mirror

  36. 1. Introduction Schedule along roadmap iKAGRAoperation

  37. Configuration Type-A: IP + GASF (5 stage) + Payload (23kg, cryogenic) Type-B: IP + GASF (3 stage) + Payload (10kg/20kg, room temp.) Type-C: Stack + Single/Double-pendulum (~1kg)

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