11111 K. Yamamoto A, T. Miyamoto A, H. Tanaka A, T. Uchiyama A, S. Zeidler B, A. Hagiwara C, N. Kimura C, R. Kumar C, T. Kume C, I. Murakami C, T. Suzuki.

11111

K. YamamotoA, T. MiyamotoA, H. TanakaA, T. UchiyamaA, S. ZeidlerB, A. HagiwaraC, N. KimuraC, R. KumarC, T. KumeC, I. MurakamiC, T. SuzukiC,

S. TerashimaC, T. TomaruC, S. TakadaD, E. MajoranaE, L. NaticchioniE,K. CraigF, A. CummingF, R. DouglasF, G. HammondF , K. HaughianF,

I. MartinF, P. MurrayF, S. RowanF , D. HeinertG, G. HofmannG, J. KommaG, S. KrokerG, R. NawrodtG, C. SchwarzG

ICRR.UTA, NAOJB, KEKC, NIFSD, INFNE, University of GlasgowF, Friedrich-Schiller-Universitaet JenaG

Development of cryogenic payload

for KAGRA VII

2015 September 27The meeting of Physical Society of Japan

@Sugimoto campus, Osaka City University, Osaka, Osaka

2

KAGRA Cryogenics Group

Toshikazu SUZUKI EO and SEO member KEK, Senior Fellow

Nobuhiro KIMURA Cryostat sub-chief KEK, Assoc. Prof.

Kazuhiro YAMAMOTO Cryo-Payload sub-chief ICRR, Project Assist. Prof.

Takayuki TOMARU Chief KEK, Assoc. Prof.

Tatsuya KUME Surveying, Alignment KEK, Assoc. Prof.

Rahul KUMAR Simulation, Payload KEK, PD

Ayako HAGIWARA CAD KEK, Technical Staff

Shinichi TERASHIMA Machining KEK, Technical Staff

Iwao MURAKAMI Welding, Assembly KEK, Technical Staff

Hiroki TANAKA Cryo-Payload, Q ICRR, Grad. Student

Takahiro MIYAMOTO Cryo-Payload ICRR, Grad. Student

Suguru TAKADA Cryogenics NIFS, Assist. Prof.

2015.Aug.27

By T. Tomaru(Revised by K. Yamamoto)

Kieran CRAIG Payload ICRR, PD

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0. Abstract

Here, I explain

Current status and next step for (1) Sapphire suspension(2) Cryogenic payload

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Contents

1. Introduction2. Sapphire suspension3. Cryogenic payload 4. Summary

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1. Introduction

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3km3km

MozumiY-end Sakonishi

X-end

AtotsuCenter

Vibration isolation system (Type A), Cryocooler unit, Cryostat, Cryogenic payload

Schematic view of KAGRA interferometer

Four mirrors of arm cavity will be cooled.

Kamioka mine (Underground site)

1. Introduction

6666

14 m

Vacuum ducts

along laser beam

Vibration isolation system(room

temperature)

Clean booth

Design drawing with tunnel and cross section

Cryostat(Here is a mirror)

2nd floor

Shaft

A. Hagiwara

Outline of vibration isolation and cryostat

1. Introduction

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Pulse tube cryocoolers

Pulse tube cryocoolers

Sapphire suspension

Sapphire mirror (About 20K)

Sapphire fiber

Schematic view of cryo-payload

Cryo-payload

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“Sapphire monolithic lop-eared suspension”

One of the most importantparts of KAGRA : Main sapphire mirrorsare included.

All parts are made from sapphire.

Sapphire lop-eared suspension

2. Sapphire suspension

fiber break

Hydroxide Catalysis Bonding

2. Sapphire suspension

9A. Hagiwara

EarNail head of fiber

Fiber with nail head on both ends

Blade spring(compensation of fiber length difference)

Mirror

Flat cut

Sapphire lop-eared suspension

2. Sapphire suspension

10

Hydroxide Catalysis Bonding

When fibers are broken, they can be removed !

Sapphire lop-eared suspension

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Current status

2. Sapphire suspension

We investigated almost all components. Measurement of Q-values of sapphire fiber is still in progress.

We must construct full size suspension (as prototype). Simpler (one fiber) prototype test is in progress.

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All sapphire parts for full size prototype have already been delivered (IMPEX and Shinkosha).

Sapphire cylinder with flat cuts as dummy mirror

Blade spring

2. Sapphire suspension

Ears

Fibers with nail head

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Jigs to assemble full size prototype (sapphire suspension) is being prepared(R. Kumar, K. Craig).

2. Sapphire suspension

K. Craig

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2. Sapphire suspension One fiber prototype simpler prototype (easier assembly) to check, for example, strength, bonding, and so on …

Sapphire blade spring

6kg sapphire mass(1/4 of KAGRA mirror)

Sapphire fiber

H. Tanaka proceeds with experiment.

D. Chen

2. Sapphire suspension

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Sapphire blade spring6kg mass (copper)(1/4 of KAGRA mirror)

Nail head of sapphire fiber

One fiber prototype

Support frame

2. Sapphire suspension One fiber prototype

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Sapphire mass

Sapphire blade spring

Dummy Cu wire

D. Chen, J. Komma, H. Tanaka, Y. Liu

2. Sapphire suspension

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One fiber prototype

Now, it is in cryostat and first (primitive) cooling test is in progress.

2. Sapphire suspension

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Measurement of Q-values of sapphire fiber

Next talk (H. Tanaka)

Q-value of 350 mm length fiber for KAGRA is not measured yet.

Short (100mm) fiber measurement suggests clamp for fiber brings loss and reduce measured Q-values.

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Outline of vibration isolation and cryostat

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Pulse tube cryocoolers

Pulse tube cryocoolers

3. Cryogenic payload

Cryo-payload

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Outline of cryogenic payload

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3. Cryogenic payload

Marionette

Intermediate mass

Sapphire Mirror

Platform

Recoil mass chain

Mirror chain

http://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=2106

Thermal noise caused by recoil mass chain is small.

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Outline of cryogenic payload

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3. Cryogenic payload

Marionette

Intermediate mass

Sapphire Mirror

PlatformGAS filer for vertical vibration isolation(Mirror chain is suspended)

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Outline of cryogenic payload

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3. Cryogenic payload

Marionette

Intermediate mass

Sapphire Mirror

PlatformAlignment adjustment system

Simple system for high Q-value of sapphire suspension

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Outline of cryogenic payload

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3. Cryogenic payload

Marionette

Intermediate mass

Sapphire Mirror

Platform

Sensor and actuator (for control and damping)

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Design

A. Hagiwara proceeds with CAD design drawings. Almost all parts except for platformwere designed.Design is based on discussion with Vibration Isolation subgroup of KAGRA.

A. HagiwaraMirror

Platform

Intermediate mass

3. Cryogenic payload

Marionette

Without recoil chain

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Design

A. Hagiwara proceeds with CAD design drawings. Almost all parts except for platformwere designed.

A. Hagiwara

Recoil mass for intermediate mass

Recoil mass for mirror

3. Cryogenic payload

Recoil mass for Marionette

With recoil chain

Prototype test of cryogenic payload Two differences from actual one

Platform does NOT include GAS filter.

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3. Cryogenic payload

Mirror and fibers are NOT made from sapphire, but metal.

272727A. Hagiwara

Dummy Mirror (and recoil mass)

Intermediate mass

3. Cryogenic payload

Marionette

Without recoil chainPrototype test of cryogenic payload Marionette, Intermediate mass,Dummy mirror, Recoil mass For (dummy mirror) has already been delivered.

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Dummy mirror and ears (stainless)

220 mm

150 mm

Recoil mass Ears (stainless)

Size and weight are the same as those of KAGRA mirror.

23 kg

3. Cryogenic payload Prototype test of cryogenic payload

2929292929292929 Intermediate massMarionette

Dummy blade spring

3. Cryogenic payload Prototype test of cryogenic payload(VIC international)

3. Cryogenic payload

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Prototype test of cryogenic payloadT. Miyamto assembled !

He is developing(1) alignment adjustment system of Marionette(2) displacement sensor for control and damping(3) coil magnet actuator for sapphire mirror

They should work around 20 K.

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4. Summary Sapphire lop-eared suspension Assembly jig for full size prototype are being prepared. (Simpler) one fiber prototype First cooling test is in progress. Measurement of Q-values of sapphire fiber Next talk by H. TanakaCryogenic payload Almost all parts except for platform were designed. Parts of mirror chain were assembled. T. Miyamoto is developing system to adjust or control cryogenic payload.

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Acknowledgement

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ELiTES: ET-LCGT interferometric Telescope Exchange of Scientists Grant for collaboration about cryogenic between KAGRA and ET European 7th Framework Programme Marie Curie action (Mar. 2012 - Feb. 2016)

European people can visit Japan for KAGRA.

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Thank you for your attention !

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4. Human resources

8 scientists2 graduate students (Master course)3 technical staffs

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4. Human resources Kieran Craig (from Glasgow) starts to work as postdoc in ICRR on the 1st of August ! (Payload, especially sapphire lop eared suspension)

Ph.D. defense was on last July ! “Studies of the mechanical dissipation of thin films for mirrors in interferometric gravitational wave detectors”

He has already worked for KAGRA as ELiTES guests.

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Backup

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6. Summary 1. Next step (by Spring 2016) Full size prototype at KEK and ICRR 2. By Spring 2017 Development of platform (GAS filter)3. By Summer 2017 Assembly and test of sapphire suspension4. In the second half of 2017 Installation at KAGRA site5. One postdoc joins one week later. KAGRA must take care of KEK people. Otherwise, they can not work for KAGRA after 2018.

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Schedule

3. Sapphire suspension

By Spring 2016 : Prototype test of full size sapphire suspension at ICRR By Autumn 2016 : Procurement of sapphire partsBy Spring 2017 : Assembly and test with End sapphire mirrorsBy Summer 2017 : Assembly and test with Front sapphire mirrors By End 2017 : Installation at KAGRA site

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Schedule

By Spring 2016 : Prototype test of full size prototype at KEK By Spring 2017 : Development of platform (GAS filter)By End 2017 : Installation at KAGRA site

3. Cryogenic payload

40

4. Schedule

41

4. Schedule

41

Full size prototype at KEK and ICRR

Assembly and test of sapphire part

Installation of cryogenic payload

Procurement of sapphire parts

Development of platform (GAS filter)

42

4. Schedule

424242

Cooling test of cryostatInstallation of Type A

Delivery of End sapphire mirrors

Delivery of Front sapphire mirrors

Installation of cryogenic payload

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Official schedule

iKAGRA observation : By end of 2015bKAGRA installation and commissioning : By end of 2017

5. Schedule

Current budget plan

By March 2016 : One cryogenic payloadsBy March 2017 : Three cryogenic payloads (+ spare)By end of 2017 : Commissioning of bKAGRA

Extremely short commissioning

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46

to SAS

View ports

Remote valve unit

4 Low vibration cryocooler unit

Main LASER beam

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)

Outline of cryostatCryogenic

payload

Mirror

S. Koike

3. Cryogenic payload

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Outline of vibration isolation and cryostat

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Pulse tube cryocoolers

Pulse tube cryocoolers

Heat link (pure Al)Heat link (pure Al)

3. Cryogenic payload

Cryo-payload