TITLE: 07/24 Owl Shift 07:00 – 15:00 (00:00-08:00), all times posted in UTC
STATE of H1: Corrective Maintenance
INCOMING OPERATOR: Corey
SHIFT SUMMARY: Power glitch has kept us out of commission for the shift. First PMC HV power supply had to be cycled, then FSS had to be manually locked. EY long range Dolphin is having issues, and different suspensions were saturating as soon as I tried to align them (Keita fixed this). Once the PSL was completely locked, IMC locked in a strange way and reported that IMC WFS were not centered. Troubleshooting instructions for IMC did not help, waiting eventually fixed the problem (I think). Moved all the optics back to the positions they were in during the last lock, but ALSX and ALSY cameras still show beam clipping. This has been preventing me from trying initial alignment.
LOG:
07:00 (00:00) Start of shift
08:53 (01:53) Going to CER to check on PMC HV power supply
09:44 (02:44) Cycling the PMC HV power supply
14:08 (07:08) Peter, Richard to EX, EY -- reboot Dolphin networks
14:36 (07:36) Peter, Richard back from EX, EY
15:00 (07:00) End of shift
Niko called this morning saying that the PSL was offline. At that point in time, the laser was on but all the servos were unlocked. The following steps were taken: - restored the Kepco high voltage power supply (BHK 500-0.4MG) settings. Output voltage 375V, current limit 50mA. These values are on a label stuck to the front panel of the power supply - lock the pre-modeecleaner by enabling the lock button and ramp button - check the output DC values of PDA and PDB on the ISS MEDM screen. Both should be ~10V. Enable the autolock. Check that the diffracted power is not gyrating wildly. An indication of this is that the pre-modecleaner transmission fluctuates by many watts. - lock the FSS by enabling the autolocker. Niko stated that it was taking some time for the FSS to acquire lock, so I told him how to lock the servo manually by entering manual mode and changing the laser crystal temperature, making note of the minimum and maximum temperature values listed in the lock acquisition range. These limits are to minimise the beat note with the ALS laser. Once a mode was observed in the reference cavity transmission camera, press the loop on button to close the loop, then press the temploop button. Enable the autolocker by pressing the ON button. The PSL was back online after completion of these steps. Next up was bringing the input modecleaner online. The message about the WFS not being centred flashed up regularly. Niko slowly brought the IMC mirrors back to their nominal positions. Whilst this was happening the reflected beam improved. After the restoration the IMC had no problems locking.