1 Cryo-payload Kazuhiro Yamamoto Institute for Cosmic Ray Research The University of Tokyo KAGRA...

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Cryo-payload

Kazuhiro Yamamoto

Institute for Cosmic Ray ResearchThe University of Tokyo

KAGRA face to face meetingUniversity of Toyama, Toyama, Japan

27 August 2015

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0. Abstract

Here, I explain

(1) Current status and next step(2) Human resources

for cryogenic payload

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Contents

1. Introduction2. Sapphire suspension3. Cryogenic payload4. Human resources 5. 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

5555

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


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

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Current status


We investigated almost all components.

We must construct full size suspension (prototype).

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All sapphire parts for full size prototype have already been delivered. Jigs for assembly is being prepared.Sapphire cylinder with flat cuts as dummy mirror

Blade spring


Ears

Fibers with nail head

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Outline of vibration isolation and cryostat

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

3. Cryogenic payload

Cryo-payload

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Outline of cryogenic payload

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Marionetta

Intermediate mass

Sapphire Mirror

Platform

Recoil mass chain(Thermal noise caused by this part is small)

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Marionetta

Intermediate mass

Sapphire Mirror

Platform

Recoil mass chain

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

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Marionetta

Intermediate mass

Sapphire Mirror

PlatformAlignment adjustment system

Simple system for high Q-value of sapphire suspension

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Marionetta

Intermediate mass

Sapphire Mirror

Platform

Recoil mass chain

Sensor and actuator (for control and damping)

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Current statusA. Hagiwara proceeds with CAD design drawings. Almost all parts except for platformwere designed.Design is based on discussion with VIS (9 Mar. 2015)

A. Hagiwara

Mirror

Platform

Intermediate mass

Recoil mass


Marionetta

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

A. Hagiwara

Recoil mass for intermediate mass

Recoil mass for mirror


Recoil mass for Marionetta

Next stepPrototype test of cryogenic payload Two differences from actual one

Platform does NOT include GAS filter.

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

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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

1919191919191919 Intermediate massMarionetta

Dummy blade spring

3. Cryogenic payload Prototype test of cryogenic payload


2020

Prototype test of cryogenic payload

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4. Human resources

8 scientists2 graduate students (Master course)3 technical staffs

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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.Jul.25

By T. Tomaru(Revised by K. Yamamoto)

Kieran CRAIG Payload ICRR, PD

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4. Human resources Kieran Craig (from Glasgow) starts to work as postdoc in ICRR on the 1st of August !

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

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5. Summary 1. Full size prototype at KEK and ICRR Cryogenic payload (KEK) Parts of mirror chain were assembled. Design of recoil mass chain and platform is in progress. Sapphire lop-eared suspension (ICRR) Assembly jig are being prepared.

2. Human resource Kieran Craig (Post doc) joins our team !

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Thank you for your attention !

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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


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


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4. Schedule

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4. Schedule

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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)

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4. Schedule

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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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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


1 Cryo-payload Kazuhiro Yamamoto Institute for Cosmic Ray Research The University of Tokyo KAGRA...

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