Reports until 17:47, Friday 17 June 2016
H1 GRD
sheila.dwyer@LIGO.ORG - posted 17:47, Friday 17 June 2016 - last comment - 09:15, Monday 20 June 2016(27819)
small change to LASER_PWR

Jenne, Nutsinee Sheila

We had trouble with locking the arm in IR for inital alingment, because PSL-POWER_SCALE_OFFSET was different from the input power.  We added a statement to the "IDLE" run state of LASER_PWR (the generator of states when not changing the power) that will adjust the normalization if it is more than 0.5Watts wrong. 

            if abs(ezca['PSL-POWER_SCALE_OFFSET'] - ezca['IMC-PWR_IN_OUTMON'])> 0.5:
                ezca['PSL-POWER_SCALE_OFFSET'] = ezca['IMC-PWR_IN_OUTMON']
 

Comments related to this report
edmond.merilh@LIGO.ORG - 09:15, Monday 20 June 2016 (27846)
Link

I came to the realization, this fine Monday morning, that this was my fault. I adjusted the laser power down from 25W to 2W without using the PSL Guardian node. Lesson learned. Apologies to those involved in the solution for taking the time to discover and fix MY "oops".