KAGRA overview Takaaki Kajita, Workshop on Gravitational Wave Activities in Taiwan for the KAGRA collaboration Jan. 15, 2017 Institute for Cosmic Ray Research, Univ. of Tokyo
Outline • Introduction • Overview of KAGRA • Status of KAGRA • Preparation for the cryogenic operation (bKAGRA) • Global GW network • Summary 2
Introduction 3
Introduction LIGO Scientific Collaboration and Virgo Collaboration, PRL, 116 , 061102 (2016) Feb. 11, 2016 Great discovery! Congratulations! Now it is clear that we can do science with GW, if we do right. 4
Overview of KAGRA KAGRA collaboration 10 countries, >200 members 5
Location KAGRA (Kamioka) Super- Kamiokande KAGRA surface facility ICRR Toyama airport 40min. by car New Atotsu Entrance 6
Key features of KAGRA Cryogenic mirrors will be used to reduce the thermal The detector will be constructed underground Kamioka. noise (in the 2 nd phase). Reduction of seismic noise (to approximately 1/100). Very high sensitivity. 7
Schematic view of KAGRA optical system • KAGRA is a huge Michelson interferometer that has optical cavities in the arms and recycling systems. (Very similar to LIGO and Virgo.) 3-km long optical ETMY cavities Mode cleaner Finesse: 1550 cavity Power recycling Inside optical power: cavity 400 kW Laser MC1 MC3 ITMY MT1 PRM PR1 ITMX ETMX MT2 BS PR2 SR1 Signal recycling cavity MC2 SRM SR2 8
Vibration isolation system Depending on the requirement, various types of vibration isolation are used. 14m high 9
Sensitivities GWIC report (2010) KAGRA Ad.-LIGO, Ad-Virgo, KAGRA similar design sensitivities 10
Status of KAGRA 11
Time line (Construction and Operation) Calendar year 2010 2011 2012 2013 2014 2015 2016 2017 2018 2010 2011 2012 2013 2014 2015 2016 2019 2020 Project start Tunnel excavation iKAGRA operation Adv. vibration isolation, optics, … bKAGRA Cryogenic system operation Today bKAGRA Cryogenic iKAGRA mirrors 12
Tunnel excavation End of April, 2012 July, 2014 New Atotsu entrance 13
3km x 3km arms X arm tunnel and vacuum tubes Connection and the leak tests of 3km X 3km beam tubes have been finished in March Y arm tunnel and vacuum tubes 2015. 14
Center area Y-arm X-arm Laser entrance Fall 2015 Summer 2016 (essentially everything is covered by clean booth) 15
iKAGRA Laser system Y-arm X-arm Laser Photo: Preparation of the iKAGRA laser (since Nov. 2014). (ISO class 1 achieved and has been kept). iKAGRA used low power laser (2W). (180W class laser in bKAGRA) 16
Installation of mirrors (and vibration isolations) Mirror for the (future) power recycling (These works continued Mode cleaner mirrors. until Feb. 2016) 17
Office building KAGRA control room in the office building 18
iKAGRA operation ON! (Please do not ask the sensitivity…) 19
Preparation for the cryogenic operation (bKAGRA) 20
Cryogenic mirrors and cryostat 2 nd floor Cryo-payload and mirror Rock Cryo shield Cryo-payload Cryo-shield Vibration Cryo-mirror tube isolation ~14m system (@room temp.) 1 st floor Cryo-cooler 21
Cryogenic system Feb. 2013 2016 Cryostat testing at Toshiba Co. 2015 All cryostats and the relevant components Connection between the installed in the KAGRA cryostat and the room temp. tunnel. V.I.S. (Summer 2016) 22
Cryo-suspension and Sapphire mirror Polished sapphire end test mass (X-end) Prototype cryo-payload 23
The next mile stones (1) March 2018: Cryogenic mirrors Cryogenic Michelson Interferometer 24
The next mile stones (1.1) Option: before summer 2018: Cryogenic mirrors Cryogenic Power-recycling Mickelson Interferometer Power recycling mirror 25
The next mile stones (2) Early 2019 (?): Cryogenic mirrors Cryogenic Dual-recycling Fabry-Perot interferometer Power recycling mirror (Might be the time KAGRA has to discuss and decide the upgrade plan of the KAGRA Signal extraction mirror interferometer…) 26
Global GW network 27
Joining the global GW network GEO-HF Ad. LIGO KAGRA Ad. Virgo LIGO-India The scientific output will be maximized by the global network. KAGRA wants to join the worldwide network of gravitational wave detection / astronomy as soon as it reaches to a high sensitivity. MOU between LSC/Virgo/KAGRA. 28
Importance of Global GW Network: Angular res. S. Fairhurst, “ Improved source localization with LIGO India ”, J. Phys.: Conf. Ser. 484 012007 LHO + LLO + Virgo LHO + LLO + Virgo + KAGRA + LIGO-India x denotes blind spots 29
Summary • KAGRA is a unique GW interferometer with the underground site and the cryogenic technology. • We had the initial operation (iKAGRA) at the end of JFY 2015. • We plan to start the initial cryogenic operation within JFY 2017 (March 2018), and full configuration in early 2019(?). • KAGRA would like to contribute to the global network of gravitational wave astronomy, a new area of astronomy. • Let us enjoy the astronomy with GW! Let us work together in KAGRA! 30
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