Development of cryogenic payload for KAGRA VII K

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, 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. UTA, NAOJB, KEKC, NIFSD, INFNE, University of Glasgow. F, Friedrich-Schiller-Universitaet Jena. G 2015 September 27 The meeting of Physical Society of Japan @Sugimoto campus, Osaka City University, Osaka 1

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

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

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

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

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

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

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

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

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

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

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

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

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 6 kg sapphire mass (1/4 of KAGRA mirror) D. Chen

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

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

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

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

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

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

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

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

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

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 Platform on discussion with Vibration Isolation subgroup of KAGRA. Intermediate mass Mirror Marionette A. Hagiwara 24

3. Cryogenic payload Design With recoil chain 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

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

3. Cryogenic payload Prototype test of cryogenic payload Without recoil chain 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

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

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

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

4. Summary Sapphire lop-eared suspension Assembly jig for full size prototype are being prepared (R. Kumar, K. Craig). (Simpler) one fiber prototype (H. Tanaka) 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 (A. Hagiwara). Parts of mirror chain were assembled and system to adjust or control cryogenic payload are being developed (T. Miyamoto). 31

Acknowledgement ELi. TES: ET-LCGT interferometric Telescope Exchange of Scientists Grant for collaboration about cryogenic between KAGRA and ET European 7 th Framework Programme Marie Curie action (Mar. 2012 - Feb. 2016) European people can visit Japan for KAGRA. 32

Thank you for your attention ! 33

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

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 ELi. TES guests. 35

Backup 36

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. 37

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

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

4. Schedule 40

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

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

5. Schedule Official schedule i. KAGRA observation : By end of 2015 b. KAGRA 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 b. KAGRA Extremely short commissioning 44

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3. Cryogenic payload Outline of cryostat to SAS Cryogenic payload Cryostat Stainless steel t 20 mm Diameter 2. 6 m Height ~3. 6 m M ~ 10 ton Mirror View ports M Cryo-coolers Pulse tube, 60 Hz 0. 9 W at 4 K (2 nd) 36 W at 50 K (1 st) 4 Low vibration cryocooler unit ai n LA SE S. Koike R be a Remote valve unit m 46

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