J. Kissel

A sincere applause to the heroic efforts of all whom have help us get back to an observation ready detector!

Picking up where Jenne left off at ~2am last night (see LHO aLOG 50954), I post a simple comparison between the ASDs of DELTAL EXTERNAL before the alignment shift (Monday, 2019-07-29 05:00 UTC) and after the alignment shift (Today, 2019-08-01 10:00 UTC).

GDS-CALIB_STRAIN reports our range is consistently ~5 Mpc lower than prior, so I was curious as to where we were different / losing out.

It appears to be a collection of minor things (no surprise).

We'll of course be doing more thorough investigations, but I thought people might wanna start here.

Since we still can't obtain GDS-CALIB_STRAIN from DTT, I attach a proxy -- DELTAL_EXTERNAL (uncorrected for time-dependence / optical plant changes) -- for your perusal.

I also attach a few-day trend of the time-dependent correction factors. It shoulds that our optical gain has dropped further (was 0.97 because we haven't yet corrected for the 35W to 37W power up), and the cavity pole is lower (now 398 Hz, as opposed to 405 Hz).
I'll be measuring the optical plant in full later today.