Alexa, Evan, Sheila, Koji

Koji, Evan and Alexa tested both the OMC PZT shutter and the fast shutter, realinged ISCT6, removed the ND filter from AS AIR and installed ND filters as beam dumps in the OMC refl path.  More details about that are coming in a latter alog.  

After Dave helped us get the h1boot back, we got a late start on trying to recover locking.  We got through the inital alingment procedure, evan set the whitening gain so that the signals out of AS AIR should be roughly similar to what they were before the change of OM1 and removal of the ND filter (he changed it from 42 dB to 15dB).  Some gains still had to be readjusted X arm IR locking gain was changed from 0.04 to 0.12, MICH dark locked gain was changed from -2000 to -1000.

We ran into a few problems along the way, the PSL noise eater was oscillating (and has been for a few days).  After togling the switch the ISS would not lock, we reset the reference level to get it locking again.  We also found a variety of settings which seem to have been wrong, the COMM PLL input was disabled, the DARM input was off, the SRM top stage length was on.  

We have been able to lock ALS COMM, but DIFF is not working.  We can engage it with a low gain, see that the PLL is kept in range, but we cannot turn the gain up. This is behavior similar to what happens when the ESD is not working, but we tried exicting the ESD in angle and watching the OpLev, we can see that it does respond.  

Also, the ETMY ESD has been tripping many times tonight, even though we have not tried to actuate on ETMY at all. 

As Kyle requested, we disabled the HV in HAM6. For the OMC PZT, we disabled the output of the 100 V Kepco supply. For the shutter, we flipped the HV enable/disable switch on the driver chassis next to HAM6.

For Jeff, we are leaving both arms locked in green with neither ALS COMM or DIFF locked.  The wind is not as high as it was forecast to be tonight.