KAGRA overview Takaaki Kajita, Workshop on Gravitational Wave - - PowerPoint PPT Presentation
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
Takaaki Kajita,
for the KAGRA collaboration
Institute for Cosmic Ray Research, Univ. of Tokyo
Workshop on Gravitational Wave Activities in Taiwan
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LIGO Scientific Collaboration and Virgo Collaboration, PRL, 116, 061102 (2016)
Great discovery! Congratulations!
Now it is clear that we can do science with GW, if we do right.
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10 countries, >200 members
KAGRA collaboration
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KAGRA
(Kamioka)
ICRR
KAGRA surface facility Super- Kamiokande Toyama airport 40min. by car
New Atotsu Entrance
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The detector will be constructed underground Kamioka. Reduction of seismic noise (to approximately 1/100). Very high sensitivity. Cryogenic mirrors will be used to reduce the thermal noise (in the 2nd phase).
3-km long optical cavities Finesse: 1550 Inside optical power: 400 kW
Laser MC1 MC2 MC3 PRM PR1 PR2 BS SR2 SR1 SRM ITMX ITMY ETMX ETMY MT1 MT2
Power recycling cavity Signal recycling cavity Mode cleaner cavity
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14m high Depending on the requirement, various types of vibration isolation are used.
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GWIC report (2010)
Ad.-LIGO, Ad-Virgo, KAGRA similar design sensitivities
KAGRA
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2010 2011 2012 2013 2014 2015 2016 2019 2020
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2010 2011 2012 2013 2014 2015 2016 2017 2018
Calendar year Project start Tunnel excavation iKAGRA bKAGRA
Cryogenic system Today
iKAGRA bKAGRA
Cryogenic mirrors
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End of April, 2012 New Atotsu entrance July, 2014
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Connection and the leak tests of 3km X 3km beam tubes have been finished in March 2015.
Y arm tunnel and vacuum tubes X arm tunnel and vacuum tubes
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Laser Y-arm X-arm
entrance
Fall 2015 Summer 2016 (essentially everything is covered by clean booth)
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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)
Laser
Y-arm X-arm
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Mode cleaner mirrors. Mirror for the (future) power recycling (These works continued until Feb. 2016)
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KAGRA control room in the office building
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(Please do not ask the sensitivity…)
ON!
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Cryogenic mirrors and cryostat
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Cryo shield
Cryo-cooler
Cryo-payload Cryo-mirror Cryo-shield tube
Rock
2nd floor
~14m
Vibration isolation system (@room temp.)
1st floor
Cryo-payload and mirror
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Cryogenic system
Cryostat testing at Toshiba Co.
2015 All cryostats and the relevant components installed in the KAGRA tunnel.
Connection between the cryostat and the room temp. V.I.S. (Summer 2016)
2016
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Prototype cryo-payload
Polished sapphire end test mass (X-end)
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March 2018:
Cryogenic Michelson Interferometer Cryogenic mirrors
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Option: before summer 2018:
Cryogenic Power-recycling Mickelson Interferometer Cryogenic mirrors Power recycling mirror
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Early 2019 (?):
Cryogenic Dual-recycling Fabry-Perot interferometer Cryogenic mirrors Power recycling mirror Signal extraction mirror (Might be the time KAGRA has to discuss and decide the upgrade plan of the KAGRA interferometer…)
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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.
KAGRA
GEO-HF LIGO-India
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Importance of Global GW Network: Angular res.
x denotes blind spots
LIGO India”, J. Phys.: Conf. Ser. 484 012007
LHO + LLO + Virgo LHO + LLO + Virgo + KAGRA + LIGO-India
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and the cryogenic technology.
(March 2018), and full configuration in early 2019(?).
gravitational wave astronomy, a new area of astronomy.