40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
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Entry  Wed Jul 8 19:42:37 2009, Clara, Update, PEM, Bonnie moved to PSL, getting some coherence with the PMC_ERR channel DSC_0567.JPGbonnie2_pmcerr.pdfbonnie_PSL.pdf
    Reply  Thu Jul 9 02:18:09 2009, rana, Update, PEM, Bonnie moved to PSL, getting some coherence with the PMC_ERR channel 
Message ID: 1727     Entry time: Thu Jul 9 02:18:09 2009     In reply to: 1726
Author: rana 
Type: Update 
Category: PEM 
Subject: Bonnie moved to PSL, getting some coherence with the PMC_ERR channel 
My guess is that we need a different acoustic strategy. The microphones are mainly for high frequencies,
so you should not expect any coherence with MC_L (or even better, MC_F) below 100 Hz. I expect that the
main coherence for MC_F will come from the PSL in that band.

After subtracting that one out, we should look at the signal from the lock of the X or Y arm, and see
if we can nail that by putting a mic right above the AS table (leaving enough room to take the lid off).
If that works OK, we can find a spot under the lid and se if it gets better.
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