K. Yamamoto and KAGRA collaboration Institute for Cosmic Ray Research the University of Tokyo
description
Transcript of K. Yamamoto and KAGRA collaboration Institute for Cosmic Ray Research the University of Tokyo
11
K. Yamamoto and KAGRA collaboration
Institute for Cosmic Ray Research the University of Tokyo
Current status of KAGRACryogenic
16 May 2012Gravitational-Wave Advanced Detector Workshop
@Waikoloa Marriot Resort, Waikoloa Beach, Hawaii, U.S.A.
2
Main contributors
K. Yamamoto, R. Takahashi, T. Sekiguchi, Y. Sakakibara, D. Chen, C. Tokoku, M. Kamiizumi,
U. Iwasaki, T. Uchiyama, S. Miyoki, M. Ohashi, T. AkutsuA, H. IshizakiA, A. TakamoriB, T. SuzukiC,
N. KimuraC, T. KumeC, S. KoikeC, K. TsubonoD, Y. AsoD, T. UshibaD, K. ShibataD, N. OhmaeE,
K. SomiyaF, R. DeSalvoG, E. MajoranaH
ICRR.UT, NAOJA,ERI.UTB, KEKC, Phys.S.UTD, E.UTE, S.TITF, Sannio UnivG., INFNH,
3
0. Abstract
I must write abstract.
4
Contents1.Introduction2.Cryostat3.Cryocooler unit4.Cryogenic payload5.ELiTES6.Future Plan7.Summary
5
1. Introduction KAGRA (previously known as: LCGT)
2nd generation interferometer in Japan
Key feature of KAGRA project Cryogenic system : Reduction of thermal noise
I will explain the progress of cryogenic group in the last one year. Now, the first km-scale cryogenic interferometer is being constructed !
6
1. Introduction
6
3km3km
MozumiY-end Sakonishi
X-end
AtotsuCenter
Vibration isolation system, Cryostat, Cryocooler, Cryogenic payload
Outline of cryostat and cryocoolersFour mirrors of arm cavity will be cooled.
1. Introduction
7
Outline of cryostat and cryocoolers
14m in height
Cryostat
Vibration Isolation(Type-A)
8
to SAS
View ports
Remote valve unit
4 Low vibration cryocooler unit
Main LASER beam
2.6m~
3.6
m
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)
1. Outline
2. Cryostat
9
2. Cryostat 3. Photos (Main body)
at Toshiba Keihin FactoryMain body (Φ2.4m, H3.8m)
Daiwa Shearing Kasuga Factory
Toshiba Keihin Factory
Cryostat Bottom plate SUS 304 t70
Cryostat Service port flange, side cap and tube
Side cap 1970 Tube 1970
Flange 2200Shimoda Flange Aioi Factory
Toshiba Keihin Factory
Cryostat components
Connection port to cryocooler unit
Ribs inside cryostat
Pipes
Welding on the connection port
Toshiba Keihin Factory
1313
3. Cryocooler unit 1. Outline
1414
3. Cryocooler unit 2. Photos
14Work progress in clean room with JIS class 7 (US class 10000)
at Jecc Torisha Kawagoe factory
3. Photos
3. Cryocooler
80K thermal conductor
8K thermal conductor Vespel support rod
Assembling in Jecc Torisha Kawagoe factory
Cryocooler itself was made by Sumitomo Heavy Industries.
16
3. Cryocooler unit 4. Cooling test : Cryocooler works well.
17
3. Cryocooler unit 5. Vibration test
18
3. Cryocooler unit 5. Vibration test
Displacement sensor
19
3. Cryocooler unit 5. Vibration test
Background
Operation
20
4. Cryogenic payload1. Outline
Sapphire fiber Sapphire
mirror(About 20K)
Shield(8K)
21
4. Cryogenic payload
2. Strategy
(1) Experiment of 1/4 cryostat in ICRR to check payload 1/4 means number of cryocooler, not size. (a) How to assemble and install (b) Cooling test (c) Control and damping (2) Other R&D Sapphire fibers to suspend mirror, External vibration via heat links (details are in K. Yamamoto talk on Thursday) and so on
22
4. Cryogenic payload
22
3. 1/4 cryostat Cryocooler has already arrived at ICRR !
2323
4. Cryogenic payload 3. 1/4 cryostat Design of 1/4 cryostat is in progress.
Preliminary.
24
5. ELiTES ELiTES: ET-LCGT interferometric Telescope Exchange of Scientists Grant for collaboration between KAGRA and ET European 7th Framework Programme Marie Curie action (Mar. 2012 - Feb. 2016)
European people can visit Japan for KAGRA.
25
5. ELiTES
25
ELiTES consists of four Working Packages.
WP1: Cryogenic payload (E. Majorana)
WP2: Cryogenic mirror (R. Nawrodt) WP3: Cooling system (K. Somiya)
WP4: Organization
26
5. ELiTES
Kick off meetings have already been held.
Teleconference every month
General meeting in Japan (this summer or autumn)
First visitor from Europe : This autumn
27
6. Future plan Mar. 2013: All cryostats and all cryostats units are assembled. 1/4 cryostat arrives.Apr. 2013 - Sep. 2014: Experiment of 1/4 prototypeApr. 2014 - Sep. 2014 : Installation of cryostats and cryocoolers in Kamioka mineJul. 2014 - Mar. 2015 : Procurement for payload Jul. 2015 - Dec. 2016: Installation and test of cryogenic payload in Kamioka mine Sep. 2017 - Mar. 2018 : Cryogenic interferometer operationApr. 2018 - : Tuning and observation
28
Thank you for your attention !
2929
2. Cryostat 2. Drawing by Toshiba Toshiba starts to make our cryostat.
Cryostat (cryochamber)
3030
2. Cryostat 2. Drawing by Toshiba Toshiba starts to make our cryostat.
Toshiba
Cryostat (radiation shields)
31
2. Cryostat 3. Photos
Ribs inside cryostat
PipesConnection port to cryo-cooler unit
Welding on the connection port
at Toshiba Keihin Factory
Main body (Φ2.4m, H3.8m)
Photos by T.Suzuki
3232
3. Cryocooler 2. PhotosTorisha made 7 cryocoolers unit and will make 9 units by March 2013. Cryocooler itself was made by Sumitomo Heavy Industries.
33
4. Cryogenic duct 1. Outline Cryogenic ducts are along optical axis and next to cryostat.
17 m in length, 0.9 m in diameter, Baffles to prevent propagation of 300 K radiation
34
4. Cryogenic duct 2. Design : in progress Details : K. Yamamoto talk tomorrow afternoon
Preliminary.
17 m
Cryostat
~ 1 m
3535
4. Cryogenic payload 4. Other R&D items (a)How to suspend mirrors using sapphire fibers (b)Vertical spring in cryostat (c)Development and test of sensors, actuators, motors in cryostat (d) Thermal noise (Q measurement of wires and coating and so on) (e) Seismic noise, external vibration noise (vibration of shield, transfer function of heat link) (f) Baffles for scattered light