K'Somiya

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2) Accomplishment of Japan RSE '98-'01 --
Result of Osamus RSE Experiments --
Kentaro Somiya University of Tokyo
LSC Meeting _at_ Livingston 2002
K.Somiya
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Review of Japan RSE 1998-2001

• 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
Asymmetry (3m)
3rd SB
RSE cavity 8.75m
0th , 1st , 2nd (No 3rd SB)
x3
Prototype RSE interferometer
51.75MHz
17.25MHz
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Experimental Setup
Large vacuum chamber
Small vacuum chamber
3m Pipe
Detector bench
Optical bench
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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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!!