aLIGO LHO Logbook

H1 PSL (PSL)

patrick.thomas@LIGO.ORG - posted 13:23, Monday 12 September 2016 - last comment - 13:33, Monday 12 September 2016(29626)

PSL Status Report - Weekly

Laser Status:
SysStat is good
Front End power is 34.9W (should be around 30 W)
Frontend Watch is GREEN
HPO Watch is GREEN

PMC:
It has been locked 0.0 days, 0.0 hr 31.0 minutes (should be days/weeks)
Reflected power is 174.5Watts and PowerSum = 292.0Watts.

FSS:
It has been locked for 0.0 days 0.0 h and 17.0 min (should be days/weeks)
TPD[V] = 4.372V (min 0.9V)

ISS:
The diffracted power is around 3.448% (should be 5-9%)
Last saturation event was 0.0 days 0.0 hours and 17.0 minutes ago (should be days/weeks)

Possible Issues:
PMC has not been locked for very long
PMC reflected power is high
FSS has not been locked for very long
ISS diffracted power is Low

Comments related to this report

jason.oberling@LIGO.ORG - 13:33, Monday 12 September 2016 (29627)

Link

Couple of notes:

Low diffracted power:
- The new normal for the ISS diffracted power is 3%-4%. The script should be updated to reflect this.
PMC reflcted power high:
- After Saturday's power glitch the power meter that measures the PMC reflected power is misbehaving. It is constantly reading 174+ watts, even though it's not seeing that much ligh; we're getting about 119W transmitted so at most we should be seeing ~31W reflected. There's a couple things I'm going to try tomorrow, but if those fail the power meter will need replacing. Until this gets resolved the Reflected Power and Power Sum for the PMC will be incorrect.