ICRC2003 08/06/2003

ICRC2003 08/06/2003

Current Status of TAMA300

Shuichi SatoNational Astronomical Observatory of Japan

for The TAMA collaboration

Contents

ICRC2003 08/06/2003

Overview of TAMA300 gravitational wave antenna

Detector siteIFO configuration

Current status of the detector

Power recyclingIFO control systemImproved IFO sensitivity

Site view

Aerial photograph of the TAMA site Aerial photograph of the TAMA site (NAOJ, Mitaka, Tokyo, JAPAN)(NAOJ, Mitaka, Tokyo, JAPAN)

300m

300m

Mitaka,Tokyo (NAOJ)

Mitaka campus of NAOJ, Tokyo (E 139.32.21 N 35.40.25)

ICRC2003 08/06/2003

Center room

West end room

South end room

IFO Configuration

ICRC2003 08/06/2003

Active air spring

Principle of Power Recycling

ICRC2003 08/06/2003

Control scheme of Power Recycled FPMI

ICRC2003 08/06/2003

Control scheme of Power Recycled FPMI

ICRC2003 08/06/2003

Improved Sensitivity

Noise level of FPMI (Without power recycling)dx ~ 1.5 x 10-18 [m/Hz1/2 ] @ 1kHz

Dominant contribution in high frequency region Detector + Shot noiseFrequency noise

ICRC2003 08/06/2003

10-20

10-19

10-18

10-17

10-16

10-15

10-14

10-13

10-12

10-11

10-10

Displacement noise [m/rHz]

101

102

103

104

105

Frequency [Hz]

2001/06/02 FPMI Phase2 theoretical limit Frequency noise (FPMI) Detector+Shot noise (FPMI)

Improved Sensitivity

ICRC2003 08/06/2003

10-20

10-19

10-18

10-17

10-16

10-15

10-14

10-13

10-12

10-11

10-10

Displacement noise [m/rHz]

101

102

103

104

105

Frequency [Hz]

2001/06/02 FPMI Phase2 theoretical limit Frequency noise (FPMI) Frequency noise (PRFPMI) Detector+Shot noise (FPMI) Detector+Shot noise (PRFPMI)

Noise level of FPMI (Without power recycling)dx ~ 1.5 x 10-18 [m/Hz1/2 ] @ 1kHz

Dominant contribution in high frequency region Detector + Shot noiseFrequency noise

Improvements Incident power

enhancement byPower recycling

Highly stabilized laser frequency

Improved Sensitivity

ICRC2003 08/06/2003

10-20

10-19

10-18

10-17

10-16

10-15

10-14

10-13

10-12

10-11

10-10

Displacement noise [m/rHz]

101

102

103

104

105

Frequency [Hz]

2001/06/02 FPMI 2003/7/12 Power recycled FPMI Phase2 theoretical limit

Noise level of FPMI (Without power recycling)dx ~ 1.5 x 10-18 [m/Hz1/2 ] @ 1kHz

Dominant contribution in high frequency region Detector + Shot noiseFrequency noise

Improvements Incident power

enhancement byPower recycling

Highly stabilized laser frequency

Noise level of PRFPMIdx ~ 8 x 10-19 [m/Hz1/2 ]

@ 1.5kHz

Expected Observable Distance for Binary Inspirals

ICRC2003 08/06/2003

70

60

50

40

30

20

10

0

Observable Distance [kpc]

10-1

2 3 4 5 6 7 8 9

100

2 3 4 5 6 7 8 9

101

2

Member mass [Msol]

0.5Msolar - 21.4kpc

1.4Msolar - 46.6kpc

4.3Msolar - 66.0kpc

10Msolar - 35.0kpc

2001/06/02 (FPMI) 2003/07/12 (Power-recycled FPMI)

SNR=10, optimal incident angle are assumed

Noise budget (DT8)

ICRC2003 08/06/2003

10-21

10-20

10-19

10-18

10-17

10-16

10-15

10-14

10-13

10-12

10-11

10-10

10-9

10-8

10-7

Displacement noise [m/rHz]

100

101

102

103

104

105

Frequency [Hz]

Displacement noise level of dL- Alignment noise Seismic noise dl- feedback noise dl+ feedback noise dL- filter noise Modulation noise Shot noise and detection system noise Shot noise (calculated) Detection system noise Laser intensity noise Laser frequency noise

Sensitivity History

ICRC2003 08/06/2003

10-22

10-21

10-20

10-19

10-18

10-17

10-16

10-15

10-14

10-13

10-12

10-11

Strain sensitivity [1/rHz]

101

102

103

104

105

Frequency [Hz]

Feb. 14, 1999 Sept. 3, 1999 Oct. 15, 1999 March. 16, 2000 Sept. 4, 2000 June. 2, 2001 July 12, 2003 Phase2 limit

Summary

ICRC2003 08/06/2003

Current status of TAMA300

Power recyclingOperating stablyAll mirrors are alignment-controlledRecycling gain : 4.5

Detector sensitivitydx~8 x10-19[m/rHz]@1.5kHzReaching practical shot noise limit

Future plan

Investigation of the noise issuesBetween 100Hz and 1kHz

Further automation for the observationTo operate the interferometer with less operators

Upgrade of the vibration isolation systemSeismic Attenuation System (SAS)For better stability and sensitivity