Alexa, Sheila

We have been unable to lock ALS COMM for more than about 5 minutes tonight, I'm not sure if this is because of high seismic, or for some other reason.  (The microseism is around (or just below) the 90th percentile, and we have convoys of trucks) We have made a few measurements of spectra, not with the WFS engaged.  The attached screen shot shows two spectra, the red trace was taken with a gain of 8dB on in 1 of the common mode board, the green trace with 19 dB.  We wanted to reproduce that the high gain loop really has lower noise, but keep dropping lock. 

The botom panel shows the coherence with the ISCT1 accelerometer that Robert moved onto the periscope today.