11111 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, K. Craig F, A. Cumming F, R. Douglas F, G. Hammond F, K. Haughian F, I. Martin F, P. Murray F, S. Rowan F, D. Heinert G, G. Hofmann G, J. Komma G, S. Kroker G, R. Nawrodt G, C. Schwarz G ICRR.UT A, NAOJ B, KEK C, NIFS D, INFN E, University of Glasgow F, Friedrich-Schiller-Universitaet Jena G Development of cryogenic payload for KAGRA VII 2015 September 27 The meeting of Physical Society of campus, Osaka City University, Osaka, Osaka

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

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

44 Contents 1.Introduction 2.Sapphire suspension 3.Cryogenic payload 4.Summary

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

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

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

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

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

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

11 Current status 2. Sapphire suspension 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.

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

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

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

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

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

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

2. Sapphire suspension 18 Measurement of Q-values of sapphire fiber Next talk (H. Tanaka) 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.

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

20 Outline of cryogenic payload Cryogenic payload Marionette Intermediate mass Sapphire Mirror Platform Recoil mass chain Mirror chain Thermal noise caused by recoil mass chain is small.

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

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

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

24 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. A. Hagiwara Mirror Platform Intermediate mass 3. Cryogenic payload Marionette Without recoil chain

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

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

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

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

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

3. Cryogenic payload 30 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.

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.

32 Acknowledgement 32 ELiTES: ET-LCGT interferometric Telescope Exchange of Scientists Grant for collaboration about cryogenic between KAGRA and ET European 7th Framework Programme Marie Curie action (Mar Feb. 2016) European people can visit Japan for KAGRA.

33 Thank you for your attention !

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

35 4. Human resources Kieran Craig (from Glasgow) starts to work as postdoc in ICRR on the 1 st 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.

36 Backup

37 6. Summary 1.Next step (by Spring 2016) Full size prototype at KEK and ICRR 2. By Spring 2017 Development of platform (GAS filter) 3.By Summer 2017 Assembly and test of sapphire suspension 4.In the second half of 2017 Installation at KAGRA site 5.One postdoc joins one week later. KAGRA must take care of KEK people. Otherwise, they can not work for KAGRA after 2018.

38 Schedule 3. Sapphire suspension 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

39 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 3. Cryogenic payload

40 4. Schedule

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

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

44 Official schedule iKAGRA observation : By end of 2015 bKAGRA installation and commissioning : By end of Schedule 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

45

46 to SAS View ports Remote valve unit 4 Low vibration cryocooler unit Main LASER beam Cryostat Stainless steel t20mm Diameter 2.6m Height ~3.6m M ~ 10 ton Cryo-coolers Pulse tube, 60Hz 0.9 W at 4K (2nd) 36 W at 50K (1st) Outline of cryostat Cryogenic payload Mirror S. Koike 3. Cryogenic payload

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