Report about the morning silent run.
Date : 2019/09/11 04:04 - 09:00
Interferometer : ALS CARM/DARM control
Important channels : K1:LSC-DARM_IN1_DQ(error signal), K1:LSC-DARM_OUT_DQ(controls signal)
I noticed Inoue-san's e-mail, I turned on the PCal line from 07:35. (07:35-09:00 ALS CARM/DARM with Xend PCal line)
Sometimes, there is large fluctuation of the ETMY. Please check the damping filters!!
During this silent run, there were 6 times lock loss.
Fig.1. GRD state flag vs Type-A TM oplev.
Tere were very large fluctuation at Y end test mass during the time of the all lock loss.
Fig.2. Seismometer placed at IXV, EXV, EYV
3rd lock loss and 6th lock loss may caused by earthquake( or large ground motion).
I checked ETMY, PEM and ALS related DQ channels during this lock.
Sometimes, there are large rms for CARM control signal and TM mass control signal
Some threshold in the ETMY_TM_DAMP_L (reason of the 1st,3rd,4th lock loss)?
There is no PEM characteristic signals
I will learn the mean of the ALS DQ channels.
