Online Veto Analysis of TAMA300

1
Online Veto Analysis of TAMA300

• Daisuke Tatsumi
• National Astronomical Observatory of Japan
• The TAMA Collaboration

8th GWDAW 19 Dec 2003 _at_ Milwaukee, UWM, USA
2
Introduction
ltVeto Analysisgt To distinguish GW signals, we
should remove noises to be misidentified as GW
signals. The veto analysis aim to identify noise
sources and to remove them.
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Noise Evaluation
Detector conditions will be changed.
We need to monitor several noises continuously.
4
Contents
We began to study Veto Analysis intended to the
following noises 1.Noise originated from Power
Recycled Michelson (l- slm) 2.Laser Intensity
Noise (Intensity Noise)

• Checking the noise mechanism to contaminate the
  GW signals
• Online evaluation as the displacement noise.

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Noise Mechanism(l- noise)
UGF 20Hz
coupling constant
Hslm
H
-
-
(llm)
(slm)
Dslm
D
Aslm
A
Fslm
F
WFslm
V2
V4
Noise Transfer Function V4 / V2
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Noise Transfer Function (l- noise)
Not consistent with measurement.
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Noise Mechanism (l- noise)
UGF 20Hz
coupling constant
Hslm
H
-
-
(llm)
(slm)
Dslm
D
Aslm
A
Fslm
F
WFslm
V2
V4
Noise Transfer Function V4 / V2
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Noise Transfer Function (l- noise)
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Noise Mechanism(Intensity Noise)
coupling constant
UGF 50kHz
HINT
H
Intensity Noise
-
-
(llm)
(INT)
DINT
D
AINT
A
FINT
F
DINT
WFINT
V4
V3
Noise Transfer Function V4 / V3
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Noise Transfer Function (Intensity Noise)
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Noise Mechanism(Intensity Noise)
coupling constant
UGF 50kHz
HINT
H
Intensity Noise
-
-
(llm)
(INT)
DINT
D
AINT
A
FINT
F
DINT
WFINT
V4
V3
Noise Transfer Function V4 / V3
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Transfer Function (dT)
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Noise Transfer Function (Intensity Noise)
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Calibration Peaks forOnline Noise Evaluation
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Online Noise Evaluation(L-, l-, Intensity)
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Online Noise Evaluation(L-, l-, Intensity)
Intensity Noise Enhancement 1. Intensity
Servo OFF 2. l- offset
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Summary
To realize online veto analysis, 1. Checking the
noise mechanisms to contaminate GW signals 2.
Online evaluation of l- and intensity noises as
displacement noise.
From now 1. Evaluation of alignment noises 2.
Noise reduction by using the online
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Checking Transfer Function
V3 / Vs
HINT
-
DINT
AINT
FINT
DINT
WFINT
Vs
V3