LIGO-G020090-00-Z 2) Accomplishment of Japan RSE '98-'01 -- Result of Osamu’s RSE Experiments -- LSC Livingston 2002 Kentaro Somiya University.

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LIGO-G Z 2) Accomplishment of Japan RSE '98-'01 -- Result of Osamu’s RSE Experiments -- LSC Livingston 2002 Kentaro Somiya University of Tokyo

Asymmetry ( ～ 3m) 51.75MHz x3 17 ． 25MHz Review of Japan RSE rd SB 0 th, 1 st, 2 nd (No 3 rd 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

Large vacuum chamber Small vacuum chamber 3m Pipe Optical bench Detector bench ←To small chamber FM BS lense FM lense Experimental Setup Compact single pendulum with eddy current damping.

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.

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.

Next Step Stabilization Power Recycling Detuning Sweeping?? We built a new RSE experiment in Feb. 2002!!