1. Current Status of TAMA300 Shuichi Sato
National Astronomical Observatory of Japan
for
The TAMA collaboration
ICRC /06/2003

2. Contents Overview of TAMA300 gravitational wave antenna Detector site
IFO configuration
Current status of the detector
Power recycling
IFO control system
Improved IFO sensitivity
ICRC /06/2003

3. Site view Mitaka campus of NAOJ, Tokyo (E 139.32.21 N 35.40.25)
Mitaka,Tokyo (NAOJ)
West end
room
300m
Center room
South end
room
Aerial photograph of the TAMA site
(NAOJ, Mitaka, Tokyo, JAPAN)
ICRC /06/2003

4. IFO Configuration
Active air spring
ICRC /06/2003

5. Principle of Power Recycling
ICRC /06/2003

6. Control scheme of Power Recycled FPMI
ICRC /06/2003

7. Control scheme of Power Recycled FPMI
ICRC /06/2003

8. Improved Sensitivity Noise level of FPMI (Without power recycling)
dx ~ 1.5 x [m/Hz1/2 1kHz
Dominant contribution in high frequency region
Detector + Shot noise
Frequency noise
ICRC /06/2003

9. Improved Sensitivity Noise level of FPMI (Without power recycling)
dx ~ 1.5 x [m/Hz1/2 1kHz
Dominant contribution in high frequency region
Detector + Shot noise
Frequency noise
Improvements
Incident power
enhancement by
Power recycling
Highly stabilized
laser frequency
ICRC /06/2003

10. Improved Sensitivity Noise level of FPMI (Without power recycling)
dx ~ 1.5 x [m/Hz1/2 1kHz
Dominant contribution in high frequency region
Detector + Shot noise
Frequency noise
Improvements
Incident power
enhancement by
Power recycling
Highly stabilized
laser frequency
Noise level of PRFPMI
dx ~ 8 x [m/Hz1/2 ]
@ 1.5kHz
ICRC /06/2003

11. Expected Observable Distance for Binary Inspirals
SNR=10, optimal incident angle are assumed
ICRC /06/2003

12. Noise budget (DT8)
ICRC /06/2003

13. Sensitivity History
ICRC /06/2003

14. Summary Current status of TAMA300 Power recycling Detector sensitivity
Operating stably
All mirrors are alignment-controlled
Recycling gain : 4.5
Detector sensitivity
dx~8
Reaching practical shot noise limit
Future plan
Investigation of the noise issues
Between 100Hz and 1kHz
Further automation for the observation
To operate the interferometer with less operators
Upgrade of the vibration isolation system
Seismic Attenuation System (SAS)
For better stability and sensitivity
ICRC /06/2003