Status of KAGRA

LSC meeting 26 Sept., 2013

Nobuhiro KIMURA (KEK)On behalf of KAGRA

Collaboration

located at Kamioka, Gifu prefecture200km west of Tokyo

Collaboration with overseas people & organizations

＊ Collaborations under formal exchange of academic agreement or MOU with ICRR or UT

LIGO Lab, EGO, Glasgow, SUCA, UWA, Tsinghua U, SIC, LSU, U Sannio＊ Agreement between collaborations MOU among LSC & Virgo has been concluded ＊ Both attachments with LSC and attachment with Virgo have been signed. ＊ Researchers’ exchange with ET under ELiTES

https://www.et-gw.eu/elitesmainmenu＊ Research collaborations under JSPS programKorean workshop (2012-2013)Germany and Japan (2012-2013)Core-to-core program (2013-2017)

Special Thanks to LIGO & LSC, EGO & Virgo

• Commitment on SAS design and production (Riccardo DeSalvo)• Advice on Optics design & production (Hiro Yamamoto )• Offering iLIGO mirrors, output telescope (D. Shoemaker, D. Reitze, M. Landry,

K. Kawabe, T. Santini, R. Haux) • Offering iLIGO Laser (R. Savage)• Transfer the technique of digital system (J. Betzwieser, Rolf Bork, Alex Ivanov)• Design of preventing stray light (Mike Smith)• Quality measurement of Optics (G. Billingsley)• Information of simulation tools (Hiro Yamamoto )• Opening the way to DCC direct access (R. Adhikari, S. Anderson, M. Araya and

S. Koranda) • Control of SAS (A. Bertolini, Riccardo DeSalvo, J. van den Brandt)• Cryogenic system design (E. Majorana, F. Ricci)• Cryogenic material tests (R. Nawrodt, S. Rowan)

Overview of KAGRA

• Characteristic features– Underground at Kamioka– Cryogenic mirror

• KAGRA science– Direct detection of GW

in one year observation– Opening GW astronomy

• World wide network

KAGRA enhances sky coverage !

CQG 28 (2011) 125023 B.F. Schutz

20K sapphire mirror

NASA Photo

Tunnel excavation: current status(@2013/09/06)

The blasting started on May 22, 2012.

Design and on site pictures

Entrance of New Atotsu

Tilted corridor (1/300) inside Tunnel (X arm)

Center Room

FCL Status- Mainly about Electricity, Architecture and Clean Rooms-

Blue prints for the construction phase II items (Electricity and Architecture) will be finished at the end of August 2013. We expect the company for the construction phase II will be decided in the end of September 2013.

Clean system and double deck layer structure designs are under construction. Almost images are drawn and we got some cost estimation for them. The biding for them will be done around April 2014.

LV meeting

Arm CrossSection

Cryostat Room

IFI, MMT,PRM,PR2,PR3,BS

AroundCorner Station

Cryostat construction and test

Toshiba Keihin Factory (Oct 31, 2012)

Cryostat #1 in preparation for installation of radiation shield. Cryostat #2 under leak test.

Cryo-cooler unit

Construction and cooling tests were finished!Inside the Rad. Shield

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Dummy payload with baffles

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Results (with copper heat links)• Cryo-coolers for payloads didn’t cool down completely (2nd stage stayed at 20 K)• Thermal conductivity of heat links calculated from results: 1/5 of literature

– Thermal contact resistance between payloads and heat links

112013.9.22 日本物理学会 2013 年秋季大会榊原裕介　 Yusuke Sakakibara

EmissivitySapphire: 0.5Platform: 0.3*(T/300K)IM: 0.4*(T/300K)

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The measurement in Toshiba

AccelerometersOne is for the vertical component.The other one is for the horizontal component.

Roma University’saccelerometer

Michelson Interferometer

Cryostat #3

Measurement axis

Our accelerometer