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Cryogenic Payload for Vibration Isolation System in KAGRA (External Review)

This document provides an overview of the cryogenic payload for the vibration isolation system in KAGRA. It discusses the design, preliminary and final schedules, prototype testing, and future plans for the cryogenic payload.

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Cryogenic Payload for Vibration Isolation System in KAGRA (External Review)

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  1. KAGRA external review (Cryogenic payload) Kazuhiro Yamamoto Institute for Cosmic Ray Research The University of Tokyo 18 April 2012

  2. I explain the cryogenic payload. This is a part of cryogenics, but it is also related with vibration isolation system. There are some minor corrections in document.

  3. 1. Overview 1.1 Definition of cryogenic payload System to suspend the cooled mirrors It is suspended from vibration isolation system (Type-A) and surrounded by thermal radiation shields. Border between vibration isolation and cryogenics. Other items in cryostat (e.g. baffles) are also considered.

  4. 1. Overview 1.2 Important interface Cryogenic : Heat link and cryostat Vibration isolation : Type-A (development, installation, commissioning) Mirror : How to suspend mirror, Coating mechanical loss, Clean room Facility : Clean room Main interferometer : Control of payload Digital systems and Electronics : Control Auxiliary Optical Systems : Baffle for scattering light and monitors

  5. 1. Overview 1.3 Design phase Cryogenic payload is not necessary in i-KAGRA (room temperature interferometer). However, the development should be in progress for b-KAGRA in i-KAGRA phase. Some cryogenic payload will be installed in i-KAGRA phase.

  6. 2. i-KAGRA Cryogenic payload is not necessary in i-KAGRA (room temperature interferometer). Nothing for i-KAGRA

  7. 3. b-KAGRA 3.1 Requirement (a) Installation in safe and clean within the short period (b) The temperature of the mirror should be below about 20 K (with about 1 W heat load). Inital cooling time shoud be short (1 month). (c) Control (and damping) of the position and angle of mirrors at cryogenic temperature (d) The sensitivity (10 Hz - 100 Hz) is not limited by the thermal noise, external vibration noise, and control noise.

  8. 3. b-KAGRA Type-A and Cryogeni payload 3.2 Preliminary design 14m in height Vibration Isolation (Type-A) Cryostat Cryogenic mirror 8 8

  9. 3. b-KAGRA 3.2 Preliminary design Cryogenic payload Shield (8K) Sapphire fiber Sapphire mirror (20K) 9 9 9

  10. 3. b-KAGRA 3.2 Preliminary design Preliminary. 10 10 10

  11. 3. b-KAGRA 3.2 Preliminary design Initial cooling time (by Y. Sakakibara) 11 11 11

  12. 3. b-KAGRA 3.2 Preliminary design Mirror temperature (by Y. Sakakibara) 12 12 12

  13. 3. b-KAGRA 3.2 Preliminary design We continue study ... External vibration (by T. Sekiguchi) (Vibration via heat link) > (Seismic motion) (> 1Hz) 13 13 13

  14. 3. b-KAGRA 3.2 Preliminary design Baffle for the (large angle) scattered light Design from Mike Smith – Caltech (support from LIGO and U.S. National Science Foundation ) Needs suspension inside radiation shield ! 14 14 14

  15. 3. b-KAGRA 3.2 Preliminary design What should we do in near future ? (1) How to assemble Details of construction in clean room …. (2) Control and damping system to reduce fluctuation and instability Actuators (what and where), resonant mode (frequency and Q) and so on (3) Noise : Thermal noise, external vibration noise, noise of control and damping system… (4) How to suspend baffle for scattered light 15 15 15

  16. 3. b-KAGRA 3.3 Schedule Cryogenic payload must be prepared in i-KAGRA phase (by Jun. 2015). In i-KAGRA phase (a) We propose experiment of 1/4 cryostat in ICRR (Kashiwa) to check payload perfomance. 1/4 means number of cryocooler, not size. (b) Other R&D (sapphire fibers ...) After these investigations, cryogenic payloads will be procured and installed. 16 16 16

  17. 3. b-KAGRA 3.3 Schedule (which we proposed) Mar. 2013 : 1/4 cryostat will arrive at Kashiwa. Apr. 2013 - Sep. 2014 : Experiment of 1/4 prototype Apr. 2013 - May 2013 : Vacuum test and cooling test without payload Assembling payload Jun. 2013 : Installation of payload, cooling test Jul. 2013 - Sep. 2014 : Cooling test, damping and control test - Sep. 2014 : R&D items (sapphire fibers ...) Sep. 2014 : Final design for payload Jul. 2014 - Mar. 2015 : Procurement

  18. 3. b-KAGRA 3.3 Schedule Jun. 2015 - Sep. 2016 Type-A (including cryogenic payload) Installation and commissioning for end mirrors Nov. 2015 - Dec. 2016 Type-A (including cryogenic payload) Installation and commissioning for front mirrors

  19. 3. b-KAGRA 3.4 Prototype test (1) 1/4 cryostat in Kashiwa (Apr. 2013 - Sep. 2014) (a) How to assemble and install (b) Cooling test (initial cooling and mirror temperature) (c) Control and damping system (including parametric instability) This is indispensableexperiment to avoid many and serious troubles in installation and comissioning in tunnel (Jun. 2015 - ).

  20. 3. b-KAGRA 3.4 Prototype test (1) 1/4 cryostat in Kashiwa (Apr. 2013 - Sep. 2014) (a) How to assemble and install (b) Cooling test (initial cooling and mirror temperature) (c) Control and damping system (including parametric instability) 1/4 cryostat and its payload are not same as those of KAGRA. Number of cryocooler (not 4, but 1) Mirror and fibers are not sapphire.

  21. 3. b-KAGRA 3.4 Prototype test Cryocooler for 1/4 cryostat has already arrived at Kashiwa.

  22. 3. b-KAGRA 3.4 Prototype test Design of 1/4 cryostat is in progress. Preliminary. 22

  23. 3. b-KAGRA 3.4 Prototype test (2) Some R&D items (a)Sapphire fibers to suspend mirror (b)Vertical spring in cryostat (c)Material for mass and wire (except for the mirrors and fibers to suspend mirror) (d)Development and test of sensors, actuators, motors in cryostat (e) Thermal noise (Calculation, Q measurement of wires and coating and so on) (f) External vibration noise (seimic motion, vibration of shield, transfer function of payload and heat link) (g) Baffles for scattered light

  24. 3. b-KAGRA 3.4 Prototype test Sapphire fibers to suspend sapphire mirrors

  25. 3. b-KAGRA 3.4 Prototype test Sapphire fibers to suspend sapphire mirrors Test sample (T. Uchiyama) 25

  26. 3. b-KAGRA 3.4 Prototype test Sapphire fibers to suspend sapphire mirrors Sapphire fibers from MolTech GmbH (Germany) Length = 350 mm diameter = 1.8 mm Almost as needed in b-KAGRA. Need to check the quality. 26 26 26

  27. 3. b-KAGRA 3.5 Quality assuarance Before procurement : We should check in experiment of 1/4 cryostat and the other R&D items. After procurement : We should check the parts in Kashiwa, KEK (Tsukuba) or Kamioka site. Test of sapphire fibers We pick up some fibers for test (thermal conductivity, mechanical Q-value, strength). The other fibers are installed in cryogenic payload.

  28. 3. b-KAGRA 3.6 Installation scenario Jun. 2015 - Sep. 2016 : X-End mirror Jun. 2015 - Jul. 2015 : Type-A installation Jul. 2015 - Dec. 2015: Cryogenic payload installation and test with fixed Type-A Jan. 2016 - Jul. 2016 : Type-A (free) + Cryogenic payload test Jul. 2016 - Sep. 2016 : Mirror is replaced by sapphire one.

  29. 3. b-KAGRA 3.6 Installation scenario Jul. 2015 - Sep. 2016 : Y-end mirror Jul. 2015 - Aug. 2015 : Type-A installation Aug. 2015 - Feb. 2016 : Type-A test with dummy load Feb. 2016 - Jul. 2016 : Cryogenic payload installation and test Jul. 2016 - Sep. 2016 : Mirror is replaced by sapphire one.

  30. 3. b-KAGRA 3.6 Installation scenario Nov. 2015 - Dec. 2016 : Front mirrors Nov. 2015 - May 2016 : Type-A installation and commissioning (Jun. 2016 - Aug. 2016 : Dual Recycling Michelson Interferometer (DRMI) experiment at room temperature) Sep. 2016 - Dec. 2016 : Cryogenic payload installation and commissioning

  31. 3. b-KAGRA 3.7 Risk management Risk 9 Budget after March of 2013 (P=3, S=3, R=9) No budget, no cryogenic payload Delay of budget may change schedule and make process of development complicate. We must win budget !

  32. 3. b-KAGRA 3.7 Risk management Risk 6 (a) Human resources (P=2, S=3, R=6) : Appendix C (b) Clean room for mirrors, payload, cryostat, and vibration isolation (P=3, S=2, R=6) We (or new associate professor of ICRR ?) should prepare clean room. (c) Sapphire fibers (P= 2, S=3, R= 6) Invesitgation and human resources (or silicon ???)

  33. 3. b-KAGRA 3.7 Risk management Risk 4 (a) Vibration via heat link (P=2, S=2, R=4) Measurement and simulation of shield vibration and heat link transfer function Careful design (b) Vertical spring in cryostat (P=2, S=2, R=4) Development should be in progress.

  34. 3. b-KAGRA 3.7 Risk management Risk 4 (c) Operation of Type-A with cryogenic payload (P=2, S=2, R=4) No test outside the mine We should learn many lessons in R&D. (d) Short installation time for mirrors (3 months) (P=2, S=2, R=4) We should learn many lessons in R&D (or adjust the schedule of DRMI experiment).

  35. 3. b-KAGRA 3.7 Risk management Risk 4Other items (P=2, S=2, R=4) Some troubles in cryogenic experiment Assembling payload Baffles for scattered light in cryostat Control and damping system Procurement of key component Unexpected long cooling and heating time Unexpected extra heat load Electric noise from cryostat Lack of space in cryostat

  36. Appendix • Design changes • after first external review • None

  37. Appendix B. Items that have been reduced in cost None

  38. Appendix C. Human resources Before installation of payload, Technical staffs, Graduate students, Post docs Experiment of 1/4 cryostat : 3persons Other R&D items : 7persons Cryogenic experiment apparatus for R&D KEK (two small vacuum flasks for liquid helium) ICRR (CLIK, small cryocooler from Mio lab) Other ?

  39. Appendix C. Human resources In installation of payload : Technical staffs 3 persons for 1 payload Jul. 2015 - Feb. 2016 : 3 persons for payload Feb. 2016 - Dec. 2016 : 6 persons for payloads If persons for Type-A are taken into account, Jun. 2015 - Jul .2015 : 3 (Type-A) Jul. 2015 - Oct. 2015 : 3 (payload) + 3 (Type-A) Nov. 2015 - Feb. 2016 : 3 (payload) + 9 (Type-A) Feb. 2016 - May 2016 : 6 (payload) + 6 (Type-A) Jun. 2016 - Dec. 2016 : 6 (payload)

  40. Thank you for your attention !

  41. 3. b-KAGRA Current status R&D items in progress Simulation for initial cooling time (Sakakibara) Thermal and mechanical simulation (Koike) Mechanical simulation (including thermal noise) (Sekiguchi) Simulation for transfer function of heat link (Aso) Calculation of thermal noise (Yamamoto) Sapphire fibers (Shibata, Ushiba, Chen, Suzuki) Material selection for mass and wire (Tokoku) Reflectance of DLC (Sakakibara) Vertical spring in cryostat (Ishizaki, Sekiguchi)

  42. 3. b-KAGRA 3.3 Schedule Mar. 2013 : 1/4 cryostat will arrive at Kashiwa. Apr. 2013 - Sep. 2014 : Experiment of 1/4 prototype - Sep. 2014 : R&D items (sapphire fibers ...) Sep. 2014 : Final design for payload Jul. 2014 - Mar. 2015 : Procurement Jun. 2015 - Sep. 2016 : Installation and commissioning for end mirrors Nov. 2015 - Dec. 2016 : Installation and commissioning for front mirrors

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