1 Kazuhiro Yamamoto Institute for Cosmic Ray Research The university of Tokyo Current status (ELiTES and IMPEX sapphire fiber) KAGRA(LCGT) cryogenic payload.

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Kazuhiro Yamamoto

Institute for Cosmic Ray ResearchThe university of Tokyo

Current status(ELiTES

and IMPEX sapphire fiber)

KAGRA(LCGT) cryogenic payload meeting6 June 2012

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ELiTESWhat is the ELiTES ? Grant for collaboration between KAGRA and ET (Mar. 2012 - Feb. 2016)

European people can visit Japan for KAGRA. However, we discussing visitors from Japan to Europe. Candidates (young reserachers) are discussed, but I do not mention their name here.

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First ‘quasi’ ELiTES face to face meeting14 May 2012 (Hawaii, GWADW2012)

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ELiTES

Research topics in Europe

Jena (Ronny Nawrodt) Mechanical (Q) and optical (refractive index) properties at cryogenic temperature

Sapphire fibers (thermal conductivity vs surface treatment) Manufacturing ribbon and so on ? (I am not so sure ... ) Clamp and pendulum Q

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ELiTES

Research topics in Europe

Jena (Ronny Nawrodt) Not so long stay (a few months) This stay should be a trigger of research. European (Japanese) reserachers learn something in Japan (Europe) and continue thier research in Europe (Japan).

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ELiTES

Research topics in Europe

Hannover (Harald Lueck) No plan for visitors to Japan

Vibration isolation system (10m prototype) Last isolation system will be installed in a few months!

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ELiTES

Research topics in Europe

Glasgow (Sheila Rowan) Coating (optical and mechanical loss) Bonding

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ELiTES

Research topics in Europe

Rome (Ettore Majorana) Cryogenic experiment : Rome and Virgo site Material properties (Q, thermal conductivity) Vibration of cryocooler Heat links

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ELiTES

Research topics in Europe

Nikhef : Vibration isolation

Sannio : Riccardo, could you show your idea ?

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ELiTES

If you (Japanese young researchers) are interested with topics in Europe,let us know.

Japanese group should summarize (1)what European researchers can research in Japan(2)what Japanese researchers would like to ask European group (reserach topics)

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ELiTES

WP3: Cooling system (K. Somiya) First meeting : 1st of June http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/LCGT/ELiTES/WP3

Crygenic-related issues Contamination control Cryo-cooler vibration isolation Cooling-Heating time reduction Scattering light Cryogenic-unrelated issues Gravity-gradient noise reduction Underground-related issues (tunnel tilt etc.)

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ELiTES

General meeting : 3rd and 4th of OctoberEuropean Union delegation in Japan (Nearest station : Hiroo (Tokyo Metro))

K. Somiya plan (Grant for Germany-Japan)August 2012 : Small workshop in JenaOctober 2012 : Small workhop in JapanGood chance for discussion about research topics and visiting labs.

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IMPEX sapphire fiberSapphire fibers to suspend sapphire mirrors Sapphire fibers from MolTech GmbH (Germany)

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IMPEX sapphire fiber

Ettore Majorana asked IMPEX (German company).

They can made similar fibers (head on the both end).

Shoter fibers (about 100 mm) for test are not so expensive.

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IMPEX sapphire fiber