Status of KAGRA LSC meeting 26 Sept., 2013 Nobuhiro KIMURA (KEK) On behalf of KAGRA Collaboration located at Kamioka, Gifu prefecture 200km 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 ＊ Research collaborations under JSPS program Korean workshop ( ) Germany and Japan ( ) Core-to-core program ( )

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) B.F. Schutz 20K sapphire mirror NASA Photo

Tunnel excavation: current status 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 We expect the company for the construction phase II will be decided in the end of September 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 LV meeting Arm Cross Section Cryostat Room IFI, MMT,PRM,PR2,PR3,BS Around Corner Station Around Corner Station

Cryostat construction and test Toshiba Keihin Factory (Oct 31, 2012) Cryostat #1 in preparation for installation of radiation shield. installation of radiation shield. Cryostat #2 under leak test. Cryo-cooler unit Construction and cooling tests were finished! Inside the Rad. Shield 9

10 Dummy payload with baffles

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 日本物理学会 2013 年秋季大会 榊原裕介 Yusuke Sakakibara Emissivity Sapphire: 0.5 Platform: 0.3*(T/300K) IM: 0.4*(T/300K)

12 The measurement in Toshiba Accelerometers One is for the vertical component. The other one is for the horizontal component. Roma University’s accelerometer Michelson Interferometer Cryostat #3 Measurement axis Ouraccelerometer