Investigation of the environment influence for the underground and cryogenic gravitational wave detector, KAGRA 16th International Conference on TAUP 2019 2019/09/10, Toyama International Conference Center, Toyama, Japan Takaaki Yokozawa(ICRR) on the behalf of the KAGRA collaboration
Contents • Underground and cryogenic GW detector, KAGRA • Environmental noise and its measurement • Physical environmental monitors • Example of the noise hunting • Toward joining international network observation O3 • Summary and future plan 2
KAGRA - Underground - 3km arm length - Cryogenic(20K) 3 Toyama Bay Toyama City KA KAGRA in Ka Kamioka, , Ja Japan Kamland Super Kamiokande CLIO KAGRA KAGRA Entrance SK Entrance
Commissioning - - Reducing the problems which cause the unlock, quick recovery - noisy period search, veto, … Line noise characterization, time variance of noise floor, glitch make the glitch and line noises Search the origin of noises which make the noise floor dirty and - Possible upgrade of VT One of the important task is 4 Safety interferometer control system - V : Volume, try to achieve the good sensitivity - T : Time, try to achieve the stable operation
Commissioning 5 - First sensitivity curve by the Fabry-Perot Michelson interferometer - Inspiral range : 102pc(BNS), 1157pc(BBH30Msum)
Commissioning 6 interferometer must reduce the noise! - iKAGRA (Apr.2016) - First 3km interferometer - bKAGRA phase1 (May.2018) - First 3km cryogenic - FPMichelson (Sep.2019) - O3 target - bKAGRA design sensitivity - Very challenging, but we
PEM : Monitors 7 - PEM : Physical Environmental Monitors
PEM : Monitors 8
PEM : Monitors 9 - We provided the PEM information in the web page - http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/PEM - https://www.icrr.u-tokyo.ac.jp/~washimi/KAGRA/PEM/PEMmap/
PEM : Portable PEMs 10 noise hunting! - We introduced a Chromebook(ASUS Flip C101PA) for the underground work - Portable PEMs will accelerate the
PEM evaluation Sound reverberation time for evaluating the Newtonian noise - Investigate the lock loss reason - Coherent channel with PEM channels - temperature, humidity, pressure, earthquake, lightning, … - Effect of the weather environment - Making sound and magnetic field map - - Photon calibrator noise evaluation - DC and AC power supply - Vibration and magnetic field evaluation for cryochamber and vacuum pump - Ground motion with seasonal, microseismic, earthquake, … - noise of the KAGRA interferometer 11 etc, etc, etc, … - There are so many activities for evaluating the environmental
PEM noise hunting 12 44Hz - There was the serious noise at 44Hz - Bruco , coherence finding tool, found the coherence with accelerometer in the Laser room - We found the origin of the vibration by portable PEM and removed it. - Succeeded in the noise hunting! - One example of the noise hunting, called 44Hz noise
Future : PEM injection 13 - Sound injection to Laser room - Sound injection to BS chamber - Preliminary results for the sound injection during the engineering run2 evaluate the effect of the environment(sound, vibration, magnetic field, RF signal, …) to the interferometer signals. - KAGRA, LIGO, Virgo PEM injectors - PEM injection : One of the important measurements to
Future : ET location study 14 advanced features for future GW detectors Virgo PEM team. - Cryogenic and underground environments are important - We started the investigation of their environmental noise with - Advanced noise measurement - Discussing about the location of the Einstein Telescope
Summary • We are in the phase of the commissioning toward joining the international network observation, O3 run. • For joining O3, improve the sensitivity is one of the important task • PEM : Physical environmental monitor plays an important role • Investigating the environmental noises for the cryogenic and underground gravitational detector. 15
Recommend
More recommend
