patrick.thomas@LIGO.ORG - posted 21:06, Monday 26 October 2015 - last comment - 22:11, Monday 26 October 2015(22859)
Ops Eve Mid Shift Summary
Evan and Sheila have left. Jenne is still here. We have made progress but the ASC loops may still be unstable (but in a different way than before). The wind has come down below 10 mph. The microseism is between .2 and .5 um/s.
Comments related to this report
jenne.driggers@LIGO.ORG - 22:11, Monday 26 October 2015 (22860)
We had one lockloss that was due to a DHARD oscillation. I didn't change anything, and the next lock was successful.
We finally got to NomLowNoise, and about an hour after Engage ASC, SRC2 Pitch started oscillating. I was running a2l, but that hopefully didn't cause the problem. In the past, we hadn't actually been dithering ETMY, but I found why that was, so this run of a2l was the first that had dither lines going to all test masses simultaneously, so it's possible that that was too much for the IFO to handle.
We had one lockloss that was due to a DHARD oscillation. I didn't change anything, and the next lock was successful.
We finally got to NomLowNoise, and about an hour after Engage ASC, SRC2 Pitch started oscillating. I was running a2l, but that hopefully didn't cause the problem. In the past, we hadn't actually been dithering ETMY, but I found why that was, so this run of a2l was the first that had dither lines going to all test masses simultaneously, so it's possible that that was too much for the IFO to handle.