Magnetic coupling noise in a Torsion-bar Antenna for Gravitational wave Observation

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1 Magnetic coupling noise in a Torsion-bar Antenna for Gravitational wave Observation

2 Abstract!!!

3 Torsion- bar Antenna (TOBA)

4 Principle of Torsion- bar Antenna z GW z GW y y x x

5 Principal sensi7vity of TOBA

6 Overview of prototype detector Pulse tube cyrocooler Support made of low thermal-conductivity

7 :

8

9 Current detector noise GW strain-equivalent noise level

10

11

12 Spectra of the external magnetic field GW strain-equivalent noise level

13 Evaluated noises Observation

14 Upgrade of the prototype detector

15 Summary!!!

16

17 low- frequency Gravita7onal wave Low frequency (0.1 1 Hz) gravitational waves are very important target for cosmology and astronomy A stochastic GW background Mergers of massive black holes Pulsers (0.1 Hz-1 khz) Laser-interferometric detector Space-borne mission Sensitive in low-frequency But we need much time, costs, risks..

18 Low- frequency Gravita7onal wave observaton Laser-interferometric detector Space-borne mission No gravity mirror is free No seismic noises Sensitive in low-frequency But we need time, costs, risks

19 Spectra of the external magnetic field GW strain-equivalent noise level

20 Principle of Torsion- bar Antenna Tosion-bar Antenna z GW y Detect the rotational fluctuation of the testmass x Tidal force of GW rotation Test mass

21 Results from one detector 8 hours observational run by two detectors on August 15, 2009 Upper limit on the GW background Ω gw (0.2 Hz) = by K Ishidoshiro How to improve the sensitivity? Test mass Noise reduction Magnetic shield, move to place with smaller seismic noise Simultaneous observation But if we use two detectors, we will enhance the sensitivity according to the observation time Bigger detector

22 Simultaneous observa7on Tokyo Timing: GPS module (Garmin GPS 15xL) Distance : 510 km Kyoto Cross correlation analysis of 5 hours Run will make a 102 times stricter limit On stochastic gravitational wave background Coming soon

23 Op7cs Vacuum chamber LASER EOM BS Interferometor PD Rotation of the test mass Output of PD changes

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