Reports until 14:30, Friday 12 April 2019
H1 OpsInfo (GRD)
sheila.dwyer@LIGO.ORG - posted 14:30, Friday 12 April 2019 - last comment - 14:54, Friday 12 April 2019(48446)
three guardian changes that need loading

Next time we are out of observing, it would be good to reload the guardians for IMC_LOCK, ALS_COMM, and OMC_LOCK.

Travis reminded us again about the annoying configuration difference that keeps coming up in the MC2_M2 Lock filter.  In inital alingment there is a more aggressive low pass used for MC2 when we are locking the X arm with IR.  The DOWN state of ALS COMM was setting this back to the less aggressive low pass used for locking in the main state, but the DOWN state of ALS COMM isn't necessarily re-requested after an initial alignment is done if ALS_COMM is already in DOWN.  This is the drawback of having 4 different gaurdians that set the state of one filter, but in this case it would be hard to avoid.  I've added an only_on statement to the IMC_LOCK guardian so that this should be reset there everytime the IMC relocks, and also copied the statement that sets this up in ALS_COMM from DOWN to PREP_FOR_HANDOFF.  This should make sure that it is set correctly each time. 

For the OMC guardian, I had tried to change the setting for the OMC ASC MASTER gain to 0.02 last night and TJ had loaded that guardian at the lockloss.  However, the gain was reset again in the state which is meant for changing the ASC over to the dithers (currently commented out).  This morning Travis and I set it by hand to the lower gain before going to observe.  I made a parameter in omcparams that is a flag indicating if we are using the dither asc or not, and now the mastergain will be set according to that flag.  The guardian was making changes to these gains in slow steps, but we have been manually doing it in single steps which hasn't caused any issues so the guardian is now doing single steps.  

Comments related to this report
travis.sadecki@LIGO.ORG - 14:54, Friday 12 April 2019 (48449)

I reloaded these after the recent lockloss.  Complete.