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Thu Mar 12 02:18:42 2009
MC_I spectra (RF_AM)
I took several spectra of MC_I signal (see attm1).
The blue curve is when the MC was locked. The green curve (RF_AM) shows the MC_I spectrum when the MC is unlocked and MC2 is mis-aligned,
so that no resonance should happen. The brown curve is when the PSL shutter was closed (dark noise).
There are some structures in the green curve but not at 3.8kHz.
The second attachment compares the MC_I spectrum (the same as the green one in the first attachment) with the Xarm error signal.
Of course these two spectra were taken at different times.
Some of the peaks in the X-arm error signal seem to be coming from the MC RF_AM.