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K. Yamamoto, R. Takahashi, T. Sekiguchi, Y. Sakakibara, C. Tokoku, M. Kamiizumi, U. Iwasaki, T. Uchiyama, S. Miyoki, M. Ohashi, T. AkutsuA,
H. IshizakiA, D. ChenA, A. TakamoriB, T. SuzukiC, N. KimuraC, S. KoikeC, K. TsubonoD, Y. AsoD, T. UshibaD, K. ShibataD, N. OhmaeE, K. SomiyaF, R. DeSalvoG, E. MajoranaH, E. HennesI, J. Van den BrandI, A. BertoliniIJ,
N.A. LockerbieK, LCGT collaboration
ICRR.UT, NAOJA,ERI.UTB, KEKC, Phys.S.UTD, E.UTE, S.TITF, Sannio UnivG., INFNH, NikefI, AEIJ, University of StrathclydeK
Development of vibration isolation systems
for LCGT VII
2012 March 24The meeting of Physical Society of Japan
@Kwansei Gakuin University, Nishinomiya, Hyogo
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K. Yamamoto, R. Takahashi, T. Sekiguchi, Y. Sakakibara, C. Tokoku, M. Kamiizumi, U. Iwasaki, T. Uchiyama, S. Miyoki, M. Ohashi, T. AkutsuA,
H. IshizakiA, D. ChenA, A. TakamoriB, T. SuzukiC, N. KimuraC, S. KoikeC, K. TsubonoD, Y. AsoD, T. UshibaD, K. ShibataD, N. OhmaeE, K. SomiyaF, R. DeSalvoG, E. MajoranaH, E. HennesI, J. Van den BrandI, A. BertoliniIJ,
N.A. LockerbieK, LCGT collaboration
ICRR.UT, NAOJA,ERI.UTB, KEKC, Phys.S.UTD, E.UTE, S.TITF, Sannio UnivG., INFNH, NikefI, AEIJ, University of StrathclydeK
Development of vibration isolation systems
for KAGRA VII
2012 March 24The meeting of Physical Society of Japan
@Kwansei Gakuin University, Nishinomiya, Hyogo
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0. Abstract
Progress of development of vibration isolation system, which includes cryogenic payload, for KAGRA in the last half year
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Contents
1.Introduction2.Vibration isolation3.Cryogenic payload4.Summary
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1. Introduction KAGRA (previously known as: LCGT)
2nd generation interferometric gravitational wave detector in Japan
Key features of KAGRA projectSilent underground site (Kamioka) : Small seismic motion reduced requirements for vibration isolation system. Cryogenic system : Reduction of thermal noise and so on
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Type-AIP + GASF (5 stage) + Payload (23kg, cryogenic)
Type-BIP + GASF (3 stage) + Payload (10kg/20kg)
Type-CStack + Single/Double-pendulum ( ~1kg)
1. Introduction
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Type-C Type-C
MirrorStack
1. Introduction
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Top filter[Filter0]
Inverted Pendulum (IP)
Standard GASFFilter1 (Filter1~3 in Type-A)
Bottom Filter (BF)
Intermediate Mass (IM)Intermediate Recoil Mass (IRM)
Test Mass (TM)Recoil Mass (RM)Optical Bench[Breadboard]
Pre-isolator
Payload
Filter chain
Type-Type-B B
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1. Introduction
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Cryogenic mirror
Cryostat
Vibration Isolation(Type A)
14m in height
Type A and
Cryo payload
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1. Introduction
Sapphire mirror(20K)
Sapphire fiber
Shield(8K)
Cryo payload
Y. Sakakibara’s talk (in this session)
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1. Introduction
Schedule for vibration isolation system of KAGRA iKAGRA (room temperature) - 2015.12 bKAGRA (cryogenic temperature) 2016.1 -
Prototype test (ICRR and NAOJ) : - 2014.3 Pre-isolator : 2011.7 – 2012.9 Type B payload : 2012.7 - 2013.6 Type B : 2013.1 - 2014.3 Assembling (Akeno and Kamioka) : 2012.4 - 2014.9 Standard GASF : 2012.4 – 2012.9 Installation (Kamioka) : 2014.4 - 2016.5 Type B (for iKAGRA) : 2014.4 - 2015.6 Type A and Type B (for bKAGRA) : 2015.5 - 2016.5
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Schedule for cryogenic payload of KAGRA iKAGRA (room temperature) - 2015.12 bKAGRA (cryogenic temperature) 2016.1 -
1/4 cryostat to test payload and R&D : - 2014.9 Design for cryostat and payload : Now 1/4 cryostat installation in ICRR (Kashiwa) : 2013.3 Experiment of 1/4 cryostat : 2013.4 - 2014.9 Procurement : 2014.10 - 2015.6
Installation : 2015.8 - 2016.12
1. Introduction
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2. Vibration isolation
Complete system
Prototype test (Pre-isolator) in Kashiwa (ICRR)
Details of experimental test will be reported by T. Sekiguchi (next talk !).
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2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR)
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Pre-isolator
Pre-isolator load
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2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR)
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Standard GASF (prototype) (production)
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2. Vibration isolation
Digital system has already been installed(O. Miyakawa’s talk in this session).
Prototype test (Pre-isolator) in Kashiwa (ICRR)
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Storage & Assembling
Delivered apparatus will be assembled in clean booths and stored in Akeno observatory (ICRR), Yamanashi.
2. Vibration isolation
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2. Vibration isolation 19 standard GASF’sfrom Italy and clean booths arrived.We will start assembling soon.
Akeno
Lucca (Italy)
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3. Cryogenic payload
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Preparation for 1/4 cryostat Design of 1/4 cryostat is in progress.
Preliminary.
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3. Cryogenic payload
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Preparation for 1/4 cryostat Design of cryogenic payload is in progress.
http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=570
Preliminary.
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3. Cryogenic payload
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Preparation for 1/4 cryostat Themal and mechanical simulation of payload (S. Koike, Y. Sakakibara, and T. Sekiguchi)
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3. Cryogenic payload
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Preparation for 1/4 cryostat (C. Tokoku)Cryocooler has already arrived at ICRR !
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3. Cryogenic payload Sapphire fibers to suspend sapphire mirrors
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3. Cryogenic payload Sapphire fibers to suspend sapphire mirrors
Test sample (T. Uchiyama)
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3. Cryogenic payload
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Sapphire fibers to suspend sapphire mirrors Sapphire fibers from MolTech GmbH (Germany)
Length = 350 mm diameter = 1.8 mm Almost as needed in bKAGRA. Need to check the quality.
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3. Cryogenic payload 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 !
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3. Cryogenic payload
Digital system for temperature monitor Discussion is in progress.
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4. Summary Vibration isolation Prototype test in Kashiwa : pre-isolator (Sekiguchi and Miyakawa’ talk) Assembling of Standard GASF in Akeno is started soon. Cryogenics payload Design of the 1/4 cryostat and payload are in progress. Cryocooler for 1/4 cryostat and test samples of sapphire fibers arrived. Baffle in cryostat and digital system are being discussed.
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Thank you for your attention !
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4. SummaryPlan for next half year Vibration isolation Prototype test : pre-isolator and payload Assembling in Akeno : Standard GASF Cryogenics payload Design of the 1/4 cryostat and payload
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(1)How to assemble Details of construction, clean room ….
(2)Strength Tensile strength, development of clamp, …
(3)Control system Actuators (what and where), resonant mode (frequency and Q)
2. Issues
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(4)Cooling
Temperature of mirror, initial cooling time, heat resistance …
(5)Noise
Thermal noise, vibration via heat links …
2. Issues
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Cryogenic payload : One of key features of LCGT projectCryogenic part of seismic isolation system
Cryostat installation in ICRR (Kashiwa) ~2013.3 (Check of cryostat system)
Check of cryogenic payload in ICRR
Preparation is in progress. (1)Thermal simulation (2)Sapphire fiber-mirror connection (3)Simulation of effect of external vibration (with heat link) (4)Thermal noise
4. Summary
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(1)How to assemble Details of construction, clean room ….
(2)Control system Actuators (what and where), resonant mode (frequency and Q)
5. Future work
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Type-B Type-B
Inverted pendulum
Top filter
2-stage GASF
Mirror
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iKAGRA operation
2011 2012 2013 2014 2015 2016 Standard GASF Prototype test in NIKHEF/ICRR Procure Assembling in AkenoPre-isolator Prototype test in ICRR Procure Assembling in AkenoType-B payload Prototype test in NAOJ Procure Assembling in Kamioka Installation Type-A SAS Prototype test in the site
Installation ETM ITM
Type-B SAS Prototype test in TAMA Installation SRM PRM Stack Procure Installation
Schedule along roadmap
1. Introduction
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Type-A: IP + GASF (5 stage) + Payload (23kg, cryogenic)Type-B: IP + GASF (3 stage) + Payload (10kg/20kg, room temp.)Type-C: Stack + Single/Double-pendulum (~1kg)
ConfiguratioConfigurationn
Chamber iKAGRA bKAGRA
ITMX, ITMY, ETMX, ETMY
Type-A
IAOX, IAOY, EAOX, EAOY
Type-B Payload on Stack(for ITM/ETM)
Type-C(for AO)
BS, PR2, PR3 Type-B Payload on Stack
Type-B
PRM, SRM, SR2, SR3
Type-B
MCF, MCE, MMT Type-C Type-C
PD, BRTX, BRTY Type-C