Ryan S., Sheila, Elenna
First thing Wednesday morning: run full initial alignment with green cameras
Ryan and I were able to lock the IFO on DRMI after many hours struggling down rabbit holes. In short: we were able to finally lock DRMI after reverting the ITMX and ITMY alignment to the alignment on Friday, and running manual initial alignment.
Sheila came online while we were in DRMI checking various things, and together we made it to CARM on Resonance. The alignment was very good (mostly hand tuned except for MICH ASC and DHARD). Sheila and I did our usual check of the PRG following alog 62110 and confirmed that everything looks great.
From there, Ryan and I ran the green camera offset scripts, watched them converge, and set the camera values. These are all SDFed- Ryan will add screenshots. To reiterate: run full initial alignment!
Sheila will add comments about checking and fixing the REFL phases.
While Sheila was adjusting the REFL phases so we could go to CARM on analog, I tried setting up the POP X centering using PM1 (so we could do DRMI on POP). I confirmed that moving PM1 moves the beam on POPX in reasonable ways. I had to flip the DC centering sign to positive when I engaged the loop, DC6, so the centering would converge. I was trying to check the UGF of the DC6 pitch loop by adding an offset to the loop, and accidentally added a massive offset, which tripped a lockloss since the beam went crazy on POPX and therefore LSC POP and that's a lockloss trigger diode.
I also had to turn on the PM1 signal output from the ASC model, which I then SDFed. After lockloss, the PM1 locking output doesn't get cleared, so Sheila will add that to the list of suspensions to clear after lockloss.
I also made a couple changes in Guardianland to keep ALS locked to set green references (line 6583 in ISC_LOCK.py; change weight from 10 to 1 to keep green locked) and I set the manual_control flag to True to not have DRMI/PRMI automatically jump to PRMI/MICH (line 22 in lscparams.py).
Screenshots of SDF accepting for green references at 'RESONANCE' attached.
I saved a template in userapps/lsc/h1/templates/CARM/check_refl_a_9_phase.xml, that puts a 200 Hz excitation (amplitude 3e-4 counts) on LSC-EXTRA_AO_OUT_2, which needs to be plugged into the CM board excitation and enabled to run this. We ran this while locked on resonance on REFLAIR, to check the phase of REFL 9. We adjusted the phase by about 20 degrees from what Jennie Wright did this morning based on the table from Daniel, 84581,. for a phase shifter setting of 24 degrees. This template also indicates that the sign of REFL9 is now oposite of the sign of REFLAIR, which we have to flip at the summing junction.
I added a line to ISC LOCK to flip this polarity in CARM_TO_ANALOG, but we lost lock before getting to try this, so we will have to watch it in the next locking attempt.
I also added PM1 to the list of suspensions that get their lock filters cleared in DOWN of ISC LOCK, and added DC6 to the list of ASC loops that get turned off in the DOWN of ISC_DRMI. These guardian changes have been added but not tested.
I also went to ISC_GEN_STATES, and added arguments to the WFS centering state to allow one to choose POP centering, or AS_REFL_POP. We can change the DRMI WFS centering to turn on the POP centering, but I haven't done that yet.
I took some open loop gain measurements of MICH and SRCL in DRMI. I had made small changes to the gains but ended up reverting all of them.
I found these templates in userapps lsc, and I saved the old traces as refs and ran new traces to compare.
My mistake last night was because DC6 nominally has an offset of 15000 in the bank because it used to control a PZT for POPX centering. To avoid making this mistake in the future, I have SDFed that offset to 0 (it's already set to be off all the time). Also, when I was setting up the POP centering, I noticed the loop needed positive gain instead of negative gain, so I flipped the sign of the gain in DC6 P and Y. We still need to tune the overall magnitude of the gain in the loop.
LSC-REFL_B DAQ readbacks were not connected. Now they are. The aanalog whitening filters were also turned on at the demod chassis (no remote control).