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K. Yamamoto A , T. Miyamoto A , H. Tanaka A , T. Uchiyama A , S. Zeidler B ,

Development of cryogenic payload for KAGRA VII. K. Yamamoto A , T. Miyamoto A , H. Tanaka A , T. Uchiyama A , S. Zeidler B , A. Hagiwara C , N. Kimura C , R. Kumar C , T. Kume C , I. Murakami C , T. Suzuki C , S. Terashima C , T. Tomaru C , S. Takada D , E. Majorana E , L. Naticchioni E ,

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K. Yamamoto A , T. Miyamoto A , H. Tanaka A , T. Uchiyama A , S. Zeidler B ,

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  1. Development of cryogenic payload for KAGRA VII K. YamamotoA, T. MiyamotoA, H. TanakaA, T. UchiyamaA, S. ZeidlerB, A. HagiwaraC, N. KimuraC, R. KumarC, T. KumeC, I. MurakamiC, T. SuzukiC, S. TerashimaC, T. TomaruC, S. TakadaD, E. MajoranaE, L. NaticchioniE, K. CraigF, A. CummingF, R. DouglasF, G. HammondF ,K. HaughianF, I. MartinF, P. MurrayF, S. RowanF ,D. HeinertG, G. HofmannG, J. KommaG, S. KrokerG, R. NawrodtG,C. SchwarzG ICRR.UTA, NAOJB, KEKC, NIFSD, INFNE, University of GlasgowF, Friedrich-Schiller-Universitaet JenaG 2015 September 27 The meeting of Physical Society of Japan @Sugimoto campus, Osaka City University, Osaka, Osaka 1 1 1 1

  2. KAGRA Cryogenics Group 2015.Aug.27 Nobuhiro KIMURA Cryostat sub-chief KEK, Assoc. Prof. Takayuki TOMARU Chief KEK, Assoc. Prof. Tatsuya KUME Surveying, Alignment KEK, Assoc. Prof. Toshikazu SUZUKI EO and SEO member KEK, Senior Fellow Kazuhiro YAMAMOTO Cryo-Payload sub-chief ICRR, Project Assist. Prof. Rahul KUMAR Simulation, Payload KEK, PD Takahiro MIYAMOTO Cryo-Payload ICRR, Grad. Student Kieran CRAIG Payload ICRR, PD Hiroki TANAKA Cryo-Payload, Q ICRR, Grad. Student Suguru TAKADA Cryogenics NIFS, Assist. Prof. By T. Tomaru (Revised by K. Yamamoto) Ayako HAGIWARA CAD KEK, Technical Staff Shinichi TERASHIMA Machining KEK, Technical Staff Iwao MURAKAMI Welding, Assembly KEK, Technical Staff 2

  3. 0. Abstract Here, I explain Current status and next step for (1) Sapphire suspension (2) Cryogenic payload 3

  4. Contents • Introduction • Sapphire suspension • Cryogenic payload • Summary 4

  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 (Type A), Cryocooler unit, Cryostat, Cryogenic payload 5 5 5 5 5 5 5 5

  6. 1. Introduction Outline of vibration isolation and cryostat 2nd floor Design drawing with tunnel and cross section A. Hagiwara Vibration isolation system (room temperature) 14 m Shaft Clean booth Vacuum ducts along laser beam Cryostat (Here is a mirror) 6 6 6

  7. 1. Introduction Schematic view of cryo-payload Sapphire suspension Pulse tube cryocoolers Pulse tube cryocoolers Sapphire fiber Cryo-payload Sapphire mirror (About 20K)

  8. 2. Sapphire suspension Sapphire lop-eared suspension “Sapphire monolithic lop-eared suspension” One of the most important parts of KAGRA : Main sapphire mirrors are included. All parts are made from sapphire. fiber break Hydroxide Catalysis Bonding 8

  9. 2. Sapphire suspension Sapphire lop-eared suspension Blade spring (compensation of fiber length difference) Fiber with nail head on both ends Flat cut Nail head of fiber Mirror Ear A. Hagiwara

  10. 2. Sapphire suspension Sapphire lop-eared suspension When fibers are broken, they can be removed ! Hydroxide Catalysis Bonding

  11. 2. Sapphire suspension Current status We investigated almost all components. Measurement of Q-values of sapphire fiber is still in progress. We must construct full size suspension (as prototype). Simpler (one fiber) prototype test is in progress. 11

  12. 2. Sapphire suspension All sapphire parts for full size prototype have already been delivered (IMPEX and Shinkosha). Sapphire cylinder with flat cuts as dummy mirror Fibers with nail head Blade spring Ears 12 12 12 12 12 12 12 12

  13. 2. Sapphire suspension Jigs to assemble full size prototype (sapphire suspension) is being prepared (R. Kumar, K. Craig). K. Craig 13 13 13 13 13 13 13 13

  14. 2. Sapphire suspension One fiber prototype simpler prototype (easier assembly) to check, for example, strength, bonding, and so on … Sapphire blade spring H. Tanaka proceeds with experiment. Sapphire fiber 6kg sapphire mass (1/4 of KAGRA mirror) D. Chen 14 14 14 14 14 14 14 14

  15. 2. Sapphire suspension One fiber prototype 6kg mass (copper) (1/4 of KAGRA mirror) Sapphire blade spring Nail head of sapphire fiber Support frame 15

  16. 2. Sapphire suspension One fiber prototype Sapphire blade spring Dummy Cu wire Sapphire mass D. Chen, J. Komma, H. Tanaka, Y. Liu

  17. 2. Sapphire suspension One fiber prototype Now, it is in cryostat and first (primitive) cooling test is in progress. 17

  18. 2. Sapphire suspension Measurement of Q-values of sapphire fiber Q-value of 350 mm length fiber for KAGRA is not measured yet. Short (100mm) fiber measurement suggests clamp for fiber brings loss and reduce measured Q-values. Next talk (H. Tanaka) 18

  19. 3. Cryogenic payload Outline of vibration isolation and cryostat Pulse tube cryocoolers Pulse tube cryocoolers Cryo-payload 19 19 19 19 19 19 19

  20. 3. Cryogenic payload Outline of cryogenic payload Mirror chain Platform Marionette Recoil mass chain Intermediate mass Thermal noise caused by recoil mass chain is small. Sapphire Mirror http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2106 20 20 20 20 20 20 20

  21. 3. Cryogenic payload Outline of cryogenic payload GAS filer for vertical vibration isolation (Mirror chain is suspended) Platform Marionette Intermediate mass Sapphire Mirror 21 21 21 21 21 21 21

  22. 3. Cryogenic payload Outline of cryogenic payload Platform Alignment adjustment system Marionette Simple system for high Q-value of sapphire suspension Intermediate mass Sapphire Mirror 22 22 22 22 22 22 22

  23. 3. Cryogenic payload Outline of cryogenic payload Platform Sensor and actuator (for control and damping) Marionette Intermediate mass Sapphire Mirror 23 23 23 23 23 23 23

  24. 3. Cryogenic payload Without recoil chain Design A. Hagiwara proceeds with CAD design drawings. Almost all parts except for platform were designed. Design is based on discussion with Vibration Isolation subgroup of KAGRA. Marionette Platform Intermediate mass Mirror A. Hagiwara 24 24

  25. 3. Cryogenic payload With recoil chain Design A. Hagiwara proceeds with CAD design drawings. Almost all parts except for platform were designed. Recoil mass for Marionette Recoil mass for intermediate mass Recoil mass for mirror A. Hagiwara 25 25

  26. 3. Cryogenic payload Prototype test of cryogenic payload Two differences from actual one Platform does NOT include GAS filter. Mirror and fibers are NOT made from sapphire, but metal. 26

  27. 3. Cryogenic payload Without recoil chain Prototype test of cryogenic payload Marionette, Intermediate mass, Dummy mirror, Recoil mass For (dummy mirror) has already been delivered. Marionette Intermediate mass Dummy Mirror (and recoil mass) A. Hagiwara 27 27

  28. 3. Cryogenic payload Prototype test of cryogenic payload Dummy mirror and ears (stainless) Size and weight are the same as those of KAGRA mirror. 23 kg 150 mm 220 mm Ears (stainless) Recoil mass 28 28 28 28 28 28 28

  29. 3. Cryogenic payload Prototype test of cryogenic payload (VIC international) Dummy blade spring Marionette Intermediate mass 29 29 29 29 29 29 29

  30. 3. Cryogenic payload Prototype test of cryogenic payload T. Miyamto assembled ! He is developing (1) alignment adjustment system of Marionette (2) displacement sensor for control and damping (3) coil magnet actuator for sapphire mirror They should work around 20 K. 30

  31. 4. Summary Sapphire lop-eared suspension Assembly jig for full size prototype are being prepared. (Simpler) one fiber prototype First cooling test is in progress. Measurement of Q-values of sapphire fiber Next talk by H. Tanaka Cryogenic payload Almost all parts except for platform were designed. Parts of mirror chain were assembled. T. Miyamoto is developing system to adjust or control cryogenic payload. 31

  32. Acknowledgement 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. 32 32 32

  33. Thank you for your attention ! 33

  34. 4. Human resources 8 scientists 2 graduate students (Master course) 3 technical staffs 34

  35. 4. Human resources Kieran Craig (from Glasgow) starts to work as postdoc in ICRR on the 1st of August ! (Payload, especially sapphire lop eared suspension) Ph.D. defense was on last July ! “Studies of the mechanical dissipation of thin films for mirrors in interferometric gravitational wave detectors” He has already worked for KAGRA as ELiTES guests. 35 35

  36. Backup 36

  37. 6. Summary • Next step (by Spring 2016) • Full size prototype at KEK and ICRR • 2. By Spring 2017 • Development of platform (GAS filter) • By Summer 2017 • Assembly and test of sapphire suspension • In the second half of 2017 • Installation at KAGRA site • One postdoc joins one week later. • KAGRA must take care of KEK people. • Otherwise, they can not work for KAGRA • after 2018. 37

  38. 3. Sapphire suspension Schedule By Spring 2016 : Prototype test of full size sapphire suspension at ICRR By Autumn 2016 : Procurement of sapphire parts By Spring 2017 : Assembly and test with End sapphire mirrors By Summer 2017 : Assembly and test with Front sapphire mirrors By End 2017 : Installation at KAGRA site 38

  39. 3. Cryogenic payload Schedule By Spring 2016 :Prototype test of full size prototype at KEK By Spring 2017 :Development of platform (GAS filter) By End 2017 : Installation at KAGRA site 39

  40. 4. Schedule 40

  41. 4. Schedule Full size prototype at KEK and ICRR Procurement of sapphire parts Assembly and test of sapphire part Development of platform (GAS filter) Installation of cryogenic payload 41

  42. 4. Schedule Cooling test of cryostat Installation of Type A Delivery of End sapphire mirrors Delivery of Front sapphire mirrors Installation of cryogenic payload 42 42 42

  43. 5. Schedule Official schedule iKAGRA observation : By end of 2015 bKAGRA installation and commissioning : By end of 2017 Current budget plan By March 2016 : One cryogenic payloads By March 2017 : Three cryogenic payloads (+ spare) By end of 2017 : Commissioning of bKAGRA Extremely short commissioning 44

  44. 45

  45. 3. Cryogenic payload 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

  46. 3. Cryogenic payload Outline of vibration isolation and cryostat Heat link (pure Al) Heat link (pure Al) Pulse tube cryocoolers Pulse tube cryocoolers Cryo-payload 47 47 47 47 47 47 47

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