summary :
We need to check the actuation efficiency between ETMX and ETMY
I noticed that the situation of the de-whitening filter in ETMX is
1. add 1 stage in the state of the LOW_NOISING_ETM
2. add more 1 stage in the state of the LOW_NOISING_SUS_FOR_PRFPMI
So, I also change the LSC_LOCK guardian
L2159
ezca['VIS-ETMX_BIO_TM_STATEREQ'] = 2
->
ezca['VIS-ETMX_BIO_TM_HP_STATEREQ'] = 2
But, the situation of lock loss didn't change (lock loss always happened when we request the more 1 stage de-whitening filter to ETMX)
So, I temporary skip the 1 stage de-whitening filter from LSC_LOCK guardian.
Then, observation state achieved, but sensitivity curve didn't change so much(Fig.1.).
(red) 0 stage de-whitening filter to ETMX (Yesterday morning)
(gold) 1 stage de-whitening filter to ETMX (This morning)
Next, I suspected the de-whitening filter didn't work, but it seemed working well (Fig.2.)
Add the 20 Hz oscillation to ETMX TM (ETMX was LOCK_ACQUISITION state).
(blue) silent case
(green) 0-stage de-whitening filter
(brown) 1-stage de-whitening filter
(red) 2-stage de-whitening filter
The height of the 20 Hz didn't change by changing the number of stage of the de-whitening filter
After that, we noticed the actuator balance between ETMX and ETMY was not so good and started the oscillation when ETMY TM mass lock.
After ~ 5 second, lock loss happened.
As very temporal, I minimize the time of ETMY mass lock, then, lock recovered, and sensitivity curve also recovered(Fig.2.).
