Reports until 18:23, Thursday 14 August 2014
H1 CDS (PSL)
david.barker@LIGO.ORG - posted 18:23, Thursday 14 August 2014 - last comment - 05:19, Friday 15 August 2014(13415)
problems opening the PSL shutter

Peter, Jim, Dave

Peter K found that he could not open the PSL shutter. We did the usual MEDM button presses which used to work to no avail. After restarting the FE and beckhoff ends several times, we reverted the PSL from the new RCG2.8.5 to its old 2.8.3. In this configuration we were able to open the shutter (though not cleanly). Tomorrow we will investigate (using the DTS) if it was the upgrade which caused this problem. For now we will leave h1psl0 at RCG2.8.3 and the laser is operational.

Comments related to this report
peter.king@LIGO.ORG - 05:19, Friday 15 August 2014 (13418)PSL
Link 

After power was restored, I brought the laser back up.  A process not quite as simple as pushing a button but was relatively a painless process.  All the servos were locked and running.  When all of a sudden I noticed that the pre-modecleaner reflection and transmission were zero.  However the laser was up and running.  The Beckhoff computer indicated that the external shutter was closed and that the EpicsAlarm was set.  Doing a system reset and a computer reboot did not fix the problem.  Neither did doing the steps Dave mentioned that were done previously to open the shutter.

The laser is up and running with the watchdog set.  All servos were left locked.