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Kazuhiro Yamamoto , Yuki Inoue AB , Ayako Ueda A ,

Status of KAGRA Cryogenics III Installation and cooling of cryogenic mirror payload on KAGRA site. Kazuhiro Yamamoto , Yuki Inoue AB , Ayako Ueda A ,

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Kazuhiro Yamamoto , Yuki Inoue AB , Ayako Ueda A ,

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  1. Status of KAGRA Cryogenics III Installation and cooling of cryogenic mirror payload on KAGRA site Kazuhiro Yamamoto, Yuki InoueAB, Ayako UedaA, Takafumi UshibaC,Toshiro OchiC, Nobuhiro KimuraA, Rahul KumarA, Toshikazu SuzukiC, Suguru TakadaD, Hiroki TanakaC, Shinichi TerashimaA, Takayuki TomaruA, Yoshikazu NamaiA, Ayako HagiwaraA, Kunihiko HasegawaC, Masashi FukunagaC, Helios VoccaE, Takahiro MiyamotoC, Isao MurakamiA, Tomohiro YamadaC, Takaharu ShishidoA, Toshiya Yoshioka,Takashi UchiyamaC, Takaaki KajitaC, Shinji MiyokiC Department of Physics University of Toyama, AKEK, BAcademia Sinica, CICRR, DNIFS, EINFN Perugia 2018 March 22 The meeting of Physical Society of Japan @Noda campus, Tokyo Universityof Science, Noda, Chiba 1 1 1 1

  2. KAGRA Cryogenics subGroup Members in Japan Takafumi USHIBA Cryo-Payload sub-chief ICRR, PD Nobuhiro KIMURA Cryostat sub-chief KEK, Assoc. Prof. Kazuhiro YAMAMOTO Sapphire sub-chief UToyama, Assoc. Prof. Takayuki TOMARU Chief KEK, Assoc. Prof. Rahul KUMAR Simulation, Payload KEK, PD Suguru TAKADA Cryogenics NIFS, Assist. Prof. Toshikazu SUZUKI Cryostat, Payload KEK, Prof. Members from Taiwan Members in Italy Helios VOCCA HCB, Perugia U, Assist. Prof. Yuki INOUE Cryogenic Payload AS, PD

  3. Technicians Ayako HAGIWARA CAD KEK, Technical Staff Ayako UEDA Exp. Assistant, KEK Technical Staff Yoshikazu. NAMAI Welding, KEK Technical Staff Shinichi TERASHIMA Machining KEK, Technical Staff No Photo Isao MURAKAMI Machining KEK, Technical Staff

  4. Students Hiroki TANAKA Cryo-Payload, Q ICRR, D2 Takahiro MIYAMOTO Cryo-Payload ICRR, D2 Kunihiko HASEGAWA Cryo-Payload ICRR, D1 Toshiro OCHI Cryo-Payload ICRR, M2 Tomohiro YAMADA Cryo-Payload ICRR, M2 Masashi FUKUNAGA Cryo-Payload ICRR, M1 Takaharu SHISHIDO Cryo-Payload KEK, M1

  5. 0. Abstract Here, I explain (1) Progress and future plan at KAGRA site (2) Investigation items in cryogenic payload (Details are presented in this session) 5

  6. Contents • Introduction • Progress at site • Items in cryogenic payload • Future plan • Summary 6

  7. 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 7 7 7 7 7 7 7 7

  8. 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 K. Okutomi 22pK402 4 Shaft Clean booth Vacuum ducts along laser beam Cryostat (Here the mirror is) 8 8 8

  9. 1. Introduction Schematic view of cryo-payload Heat link Sapphire mirror

  10. 1. Introduction Schematic view of sapphire suspension Connection between mirror and fibers is crucial point. KAGRA adopts sapphire ears for this connection. Connection between mirror and ears must be strong. Hydroxide Catalysis Bonding (HCB) is adopted. This bonding is based on chemical reaction. Sapphire fibers Sapphire mirror 10 10 10 10 10 10 10 10 10 10 10

  11. 1. Introduction Schematic view of sapphire suspension Connection between mirror and fibers is crucial point. KAGRA adopts sapphire ears for this connection. Connection between mirror and ears must be strong. Hydroxide Catalysis Bonding (HCB) is adopted. This bonding is based on chemical reaction. Sapphire fibers Sapphire mirror 11 11 11 11 11 11 11 11 11 11 11

  12. 1. Introduction Sapphire mirror 22cm 15cm 23kg （Density is 4 times larger than that of water） 12 12 12 12 12 12 12 12

  13. 2. Progress at site 2018 spring：Test run of cryogenic simple Michelson interferometer(with 2 sapphire mirrors） Y end Extra mirror It is cooled down ! ETM X end Installation of practical mirror is in progress. 3km MC ETM PRM BS IO 3km 13 13 13 13 13 13 13 13 13 13 13

  14. 2. Progress at site Cryogenic payload with extra sapphire mirror was installed (suspended by Type A at Y end) at end of November 2017. https://www.kek.jp/ja/NewsRoom/Release/20171221090000/

  15. 2. Progress at site Cryogenic payload with extra sapphire mirror was installed (suspended by Type A at Y end) at end of November 2017. https://www.kek.jp/ja/NewsRoom/Release/20171221090000/

  16. 2. Progress at site This cryogenic payload (at Y end) was cooled down at middle of March 2017. 14th of March 7th of February

  17. 2. Progress at site Direction of this cooled sapphire mirror (at Y end) was adjusted. Reflected light arrives at photo detector. ETM Light reflected by ETM arrives ! 3km MC ETM PRM BS IO 3km

  18. 2. Progress at site Resonances of cryogenic payload of this cooled sapphire mirror (at Y end) should be suppressed (damping). Yaw motion sapphire mirror is most serious problem. Amplitude of yaw motion : 10 mrad Requirement : 1 mrad Yaw motion

  19. 2. Progress at site HCB for ears in clean room at University of Toyama September and October 2017 Two extra mirrors -> One of them was installed at Y end. January 2018 First practical mirror ! -> Installation is being in progress at X end. HCB for ears

  20. 2. Progress at site

  21. 2. Progress at site First practical sapphire mirror was transported to KAGRA site on 9th of March 2018. On 8th of March, this mirror in clean room in University of Toyama was shown to mass media. Almost all main newspapers and televisions came. Sapphire mirror https://www.u-toyama.ac.jp/education/news/2018/0312a.html https://www.jiji.com/jc/article?k=2018030801061&g=soc

  22. 3. Items in cryogenic payload Schematic view of cryo-payload Sapphire mirror is contaminated by residual gas. Power recycling to reduce shot noise (quantum fluctuation of phase of laser) could not effective.

  23. 3. Items in cryogenic payload Change of power recycling gain in 1 year operation K. Hasegawa 22pK402 8

  24. 3. Items in cryogenic payload Schematic view of cryo-payload

  25. 3. Items in cryogenic payload Outline of cryogenic payload Platform Sensor and actuator (for control and damping) Marionette Intermediate mass Sapphire Mirror 25 25 25 25 25 25 25

  26. 3. Items in cryogenic payload Outline of cryogenic payload Platform Coil magnet actuator Fluctuation of magnetic fields can shake mirrors. Marionette Intermediate mass Sapphire Mirror Magnets Coils 26 26 26 26 26 26 26

  27. 3. Items in cryogenic payload In order to evaluate magnetic field noise, magnetic moment of magnets are measured. H. Tanaka 22pK402 9 27 27 27 27 27 27 27

  28. 3. Items in cryogenic payload Outline of cryogenic payload Relative optical displacement sensor Efficiency of sensor depends on temperature. Platform Marionette Intermediate mass Sapphire Mirror 28 28 28 28 28 28 28

  29. 3. Items in cryogenic payload Calibration of optical displacement sensor at low and room temperature M. Fukunaga 22pK402 10 29 29 29 29 29 29 29

  30. 3. Items in cryogenic payload Schematic view of cryo-payload Heat link Heat path to cool down It also transmits vibration ! 30

  31. 3. Items in cryogenic payload Measurement of thermal conductivity of heat links Calculation of vibration transmitted by heat links T. Yamada 22pK402 11 31

  32. 3. Items in cryogenic payload Schematic view of cryo-payload Vibration Vibration can contaminate output of KAGRA detector via (1)Heat link (2)Scattered light Radiation shield 32

  33. 3. Items in cryogenic payload Vibration measurement T. Ochi 22pK402 12 33

  34. 4. Future plan 2018 spring：Test run of cryogenic simple Michelson interferometer(with 2 sapphire mirrors） ETM 3km MC ETM PRM BS IO 3km 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34 34

  35. 4. Future plan 2018 spring：Test run of cryogenic simple Michelson interferometer(with 2 sapphire mirrors） Test run : 23 April 2018 – Measurement items of Cryogenic subgroup 3km Michelson interferometer has highest sensitivity at site. Michelson interferometer can be calibrated well. Mechanical response (transfer function) of cryogenic payload Calibration of local (relative displacement) sensor Injection test (vibration, magnetic field) 35 35 35 35 35 35 35 35 35 35 35

  36. 4. Future plan After test run on spring 2018 Other three practical mirrors will be installed by spring of 2019. -> Adjustment and so on. -> Observation with LIGO and Virgo (O3) ETM Extra mirror will be replaced with practical one. Y-arm ITM MC ETM PRM BS X-arm IO ITM 36 36 36 36 36 36 36 36 36 36 36

  37. 5. Summary Progress at site One extra mirror was installed and cooled down at Y end. One practical mirror is being installed at X end. Future plan at site On spring of 2018 Test run of cryogenic simple Michelson interferometer with two sapphire mirrors. By spring of 2019 All four practical sapphire mirrors will be installed. Investigation items of cryogenic payload Details will be presented by next 5 speakers. 37

  38. Thank you for your attention ! 38

  39. Backup 39

  40. 2. Cryostats at site We must conduct cooling test of all cryostats by March 2017. So far, at both ends, missions for assembly and connection were over. Leak check is current main mission at both ends. Mission for two cryostats in center room will be started on November.

  41. 2. Cryostats at site So far, at both ends, missions as below were over. (2) Connection 4K cryocoolers unit to each cryostats to SAS Outline of cryostat 4 Low vibration cryocooler unit Remote valve unit S. Koike 41

  42. 3. Cryogenic payload Outline of vibration isolation and cryostat Pulse tube cryocoolers Pulse tube cryocoolers Cryo-payload 42 42 42 42 42 42 42

  43. 3. Cryogenic payload Outline of vibration isolation and cryostat Platform Recoil mass for Marionette Recoil mass for intermediate mass Recoil mass for mirror A. Hagiwara 43 43

  44. 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 44 44 44 44 44 44 44

  45. 3. Cryogenic payload Outline of cryogenic payload GAS filer for vertical vibration isolation (Mirror chain is suspended) Platform Marionette Intermediate mass Sapphire Mirror 45 45 45 45 45 45 45

  46. 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 46 46 46 46 46 46 46

  47. 3. Cryogenic payload Outline of cryogenic payload Platform Sensor and actuator (for control and damping) Marionette Intermediate mass Sapphire Mirror 47 47 47 47 47 47 47

  48. 3. Cryogenic payload 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. 48

  49. 3. Cryogenic payload 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

  50. 3. Cryogenic payload Sapphire lop-eared suspension Indium bonding on both nail heads of fiber When fibers are broken, they can be removed ! Hydroxide Catalysis Bonding between ear and mirror

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