ligo-g020090-00-z 2) accomplishment of japan rse '98-'01 -- result of osamu’s rse...
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LIGO-G020090-00-Z
2) Accomplishment of Japan RSE '98-'01 -- Result of Osamu’s RSE Experiments --
LSC Meeting @ Livingston 2002
Kentaro SomiyaUniversity of Tokyo
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I
17.25MH
EOM I solator
Asymmetry
(~ 3m)
51.75MHz
x3
17. 25MHz
Review of Japan RSE 1998-2001
3rd SB
0th , 1st , 2nd (No 3rd SB)
•Suspended by single pendulum.•Staying in vacuum chamber.•Aligned in parallel (not L).•No Power Recycling.•No detuning.•Only single modulation.•Third harmonics demodulation with 60 degree asymmetry.
Arm cavity 4m
Prototype RSE interferometer
RSE cavity 8.75m
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Large vacuum chamber
Small vacuum chamber 3m Pipe
Opticalbench
Detectorbench
←To smallchamber
FM BSlense
FM lense
Experimental Setup
Compact single pendulum with eddy current damping.
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Result : RSE lock!
•Suspended RSE lock.
•Typically 10min. lock.
•Relative TF (Signal Gain) is measured with end mass swept mechanically.
•Details are written on Osamu's doctor thesis.
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6
80.1
2
4
6
81
2
T.F
.
103
2 3 4 5 6 7 8
104
2 3 4
Frequency[Hz]
SR/FPMISR/FPMI(cal.)
Interesting! : SR lock with natural detuning
•SR is locked on a side robe of error signal (Polarity is changed).
•Unstable lock produces natural detuning effect.
•It seems to be averaged for higher frequencies.
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Next Step
•Stabilization
•Power Recycling
•Detuning
•Sweeping??
We built a new RSE experiment in Feb. 2002!!