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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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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 (old name: LCGT)

2nd generation interferometric 　　　　　　　　　　　 gravitational wave detector in Japan

Key features of KAGRA projectSilent underground site (Kamioka) : 　　　　　　　 Small seismic motion Vibration isolation system is necessary. 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)

Filter1 (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-B Type-B

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1. Introduction

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Cryogenic mirror

Cryostat

Vibration Isolation(Type A)

14m

Type A and

Cryo payload

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1. Introduction

Sapphire mirror(20K)

Sapphire fiber

Shield(8K)

Cryo payload

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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 and R&D : - 2014.9 Design for cryostat and payload : Now

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

Total system

Prototype test (Pre-isolator) in Kashiwa (ICRR)

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2. Vibration isolation

Pre-isolator

Prototype test (Pre-isolator) in Kashiwa (ICRR)

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2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR)

Load for pre-isolator

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2. Vibration isolation Prototype test (Pre-isolator) in Kashiwa (ICRR)

Standard GASF (prototype)

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2. Vibration isolation

Digital system has already been installed(O. Miyakawa’s talk in this session).

Details of experimental test will be reported by T. Sekiguchi (next talk !).

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.

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3. Cryogenic payload

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Preparation for 1/4 cryostat Design of 1/4 cryostat is in progress.

This is NOT FINAL version.

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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

This is NOT FINAL version.

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3. Cryogenic payload

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Preparation for 1/4 cryostat Themal and mechanical simulation of payload (S. Koike 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)

Thier length (350 mm) and diameter (1.8 mm) are almost same as what we will need in bKAGURA. We should check the quality.

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3. Cryogenic payload Baffle for the (large angle) scattered light

Mike Smith (Caltech, the support of LIGO and the U.S. National Science Foundation )How will it be suspended in 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. Discussion for 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 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 　 ET

M 　 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 bKAGRAITMX, 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-CPD, BRTX, BRTY Type-C