Jeff K., Krishna V.

The data from Tuesday (August 12) night looks very encouraging. The tiltmeter was in vacuum (but not being pumped, so P my be ~ mtorr) and the box was closed. The first plot shows the tiltmeter data (high passed at 10 mHz) over 40k seconds starting from ~9 PM. I've divided by the transfer function to take out the resonance. Note that the vacuum vessel is still not wrapped in foam and doing so along with turning on the ion pump should improve the low frequency noise.

The next plot shows the ASD of 15k seconds of the above data during the quiet part in the middle. The third plot shows the ASD of 5k seconds of data from above, showing the quietest angle data I've ever seen :)

I'll add more about the investigation of the transfer function measurement, hopefully later tonight.