Kazuhiro Yamamoto

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Current status (ELiTES and IMPEX sapphire fiber)
Kazuhiro Yamamoto Institute for Cosmic Ray
Research The university of Tokyo
KAGRA(LCGT) cryogenic payload meeting 6 June 2012
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ELiTES
What 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 meeting 14 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-rel
ated 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 October European
Union delegation in Japan (Nearest station
Hiroo (Tokyo Metro)) K. Somiya plan (Grant for
Germany-Japan) August 2012 Small workshop in
Jena October 2012 Small workhop in Japan Good
chance for discussion about research topics and
visiting labs.
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IMPEX sapphire fiber
Sapphire 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