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Status of KAGRA

LSC meeting 26 Sept., 2013. Status of KAGRA. Nobuhiro KIMURA (KEK) On behalf of KAGRA Collaboration. located at Kamioka, Gifu prefecture 200km west of Tokyo. Collaboration with overseas people & organizations.

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Status of KAGRA

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  1. LSCmeeting 26 Sept., 2013 Status of KAGRA Nobuhiro KIMURA(KEK) On behalf of KAGRA Collaboration located at Kamioka, Gifu prefecture 200km west of Tokyo

  2. 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 collaborationsMOU 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 program Korean workshop (2012-2013) Germany and Japan (2012-2013) Core-to-core program (2013-2017)

  3. 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, RiccardoDeSalvo, J. van den Brandt) • Cryogenic system design (E. Majorana, F. Ricci) • Cryogenic material tests (R. Nawrodt, S. Rowan)

  4. 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 NASA Photo KAGRA enhances sky coverage ! 20K sapphire mirror CQG 28 (2011) 125023 B.F. Schutz

  5. Tunnel excavation: current status(@2013/09/06) The blasting started on May 22, 2012.

  6. Design and on site pictures Tilted corridor (1/300) inside Tunnel (X arm) Center Room Entrance of New Atotsu

  7. FCL Status- Mainly about Electricity, Architecture and Clean Rooms- Cryostat Room Around Corner Station • 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. IFI, MMT,PRM,PR2,PR3,BS Arm Cross Section LV meeting

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

  9. Dummy payload with baffles

  10. 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 Emissivity Sapphire: 0.5 Platform: 0.3*(T/300K) IM: 0.4*(T/300K) 2013.9.22 日本物理学会 2013年秋季大会 榊原裕介　Yusuke Sakakibara 11

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

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