cheryl.vorvick@LIGO.ORG - posted 09:15, Thursday 07 July 2016 - last comment - 14:53, Thursday 07 July 2016(28222)
H1 Update: work on laser is done, locking full IFO resumes
Peter was in the PSL enclosure and looking at the FSS - his alog will give details.
He's done so I'm starting to lock.
DRMI locked at 16:36UTC
POP X PZT railed, but POP signal is still centered on the QPD, so this is on the "to be fixed" list, but does not prevent locking. POP X is accessable from the ASC overview screen.
in DC READOUT TRANSITION, OMC guardian was stuck in DOWN, and was unstuck by running it through INIT.
I unintentionally killed the lock by requesting the INCREASE POWER state in ISC_LOCK.
I thought this would just stop the ISC_LOCK guardian in this state, keeping the input power at 38W.
Instead it reran the code for INCREASE POWER from the beginning and lowered the input power to 10W, killing the lock.
Broken:
So I thought the power was going to increase to 50W, based on what the LASER_POWER guardian main screen was showing, however TJ explained that the guardian can only request so many states, so the power was going to stop at 40W but the guardian could not show that because 40W was not a requestable state.
Fixed:
TJ rewrote the LASER_POWER guardian to make 40W a requestable state, so when we're going to 40W it will show this.
TJ also set the ISC_LOCK to stop at 25W input power on out next lock.
Currently, we have the IMC locked and at 40W input power.
Keita is looking at the ISS Second Loop and measuring the correct offset for 40W.
18:32UTC - adjustments made for running at 25W are complete - now relocking H1
DRMI locked at 18:43UTC
19:12UTC - H1 in DC readout and heading to ENGAGE ISS 2nd loop
19:58UTC -------------
H1 made it to ENGAGE ISS 2ND LOOP which is good, because getting to the point where we could engage the 2nd loop is progress, however engaging the loop revealed an issue which broke the lock.
Jenne and Keita are looking into it.
******** my estimate of having H1 in Observer was a bit optomistic - 4PM today (23:00UTC) is more likely.
21:04UTC - locked and going to ENGAGE_ISS2ND_LOOP without engaging the loop, to do measurements
lockloss
last entry for this log:
21:52UTC - H1 is back in ENGAGE ISS 2ND LOOP with the ISS 2nd loop disabled.
Keita and Jenne are looking for a fix, so H1 can go to Observe.