Investigation of the environment influence for the underground and - - PowerPoint PPT Presentation

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

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KAGRA

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Kamland CLIO

Super Kamiokande

Toyama City Toyama Bay

KA KAGRA in Ka Kamioka, , Ja Japan

KAGRA Entrance SK Entrance

KAGRA

• 3km arm length
• Underground
• Cryogenic(20K)

Commissioning

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One of the important task is

Possible upgrade of VT

• V : Volume, try to achieve the good sensitivity
• Search the origin of noises which make the noise floor dirty and

make the glitch and line noises

• Line noise characterization, time variance of noise floor, glitch

noisy period search, veto, …

• T : Time, try to achieve the stable operation
• Reducing the problems which cause the unlock, quick recovery
• Safety interferometer control system

Commissioning

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• First sensitivity curve by the Fabry-Perot Michelson interferometer
• Inspiral range : 102pc(BNS), 1157pc(BBH30Msum)

Commissioning

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• iKAGRA (Apr.2016)
• First 3km interferometer
• bKAGRA phase1 (May.2018)
• First 3km cryogenic

interferometer

• FPMichelson (Sep.2019)
• O3 target
• bKAGRA design sensitivity
• Very challenging, but we

must reduce the noise!

PEM : Monitors

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• PEM : Physical Environmental Monitors

PEM : Monitors

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PEM : Monitors

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• http://gwwiki.icrr.u-tokyo.ac.jp/JGWwiki/KAGRA/Subgroups/PEM
• https://www.icrr.u-tokyo.ac.jp/~washimi/KAGRA/PEM/PEMmap/
• We provided the PEM information in the web page

PEM : Portable PEMs

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• Portable PEMs will accelerate the

noise hunting!

• We introduced a Chromebook(ASUS Flip C101PA) for the underground work

PEM evaluation

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• There are so many activities for evaluating the environmental

noise of the KAGRA interferometer

• Ground motion with seasonal, microseismic, earthquake, …
• Vibration and magnetic field evaluation for cryochamber and vacuum pump
• DC and AC power supply
• Photon calibrator noise evaluation
• Sound reverberation time for evaluating the Newtonian noise
• Making sound and magnetic field map
• Effect of the weather environment
• temperature, humidity, pressure, earthquake, lightning, …
• Coherent channel with PEM channels
• Investigate the lock loss reason
• etc, etc, etc, …

PEM noise hunting

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• One example of the noise hunting, called 44Hz noise

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!

Future : PEM injection

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• Sound injection to Laser room
• Sound injection to BS chamber
• Preliminary results for the sound injection during the engineering run2
• PEM injection : One of the important measurements to

evaluate the effect of the environment(sound, vibration, magnetic field, RF signal, …) to the interferometer signals.

• KAGRA, LIGO, Virgo PEM injectors

Future : ET location study

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• Cryogenic and underground environments are important

advanced features for future GW detectors

• We started the investigation of their environmental noise with

Virgo PEM team.

• 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