Reports until 19:18, Tuesday 04 February 2014
H1 PSL
sheila.dwyer@LIGO.ORG - posted 19:18, Tuesday 04 February 2014 (9824)
PSL restarted, ref cav alinged
Sheila, Paul

We restarted the PSL after the power watchdog tripped.  (to do this we transitioned the enclosure to science mode).  After the laser had been on for about 15 minutes I thought it would be OK to try to align the ref cav (the trans power had dropped to 0.75 V in the last few days).  
Before the AOM we had 31mW,( measured with the filter in) 30.5 after the first pass, and 18.6 after the second pass.  (60% double pass diffraction efficiency).  I tried to improve this my adjusting the alignment of the retroreflecting mirror, but wasn't able to get any better, and the final alignment had about 17.6 mW after the second pass (57% double pass eifficency).  Tuning up the alignment into the cavity we got the trans PD up to 0.94V, but after I transitioned back to science mode the trans power dropped to 0.86V.