J. Oberling, R. Short

This morning we tweaked the beam alignment into the PMC and FSS RefCav, remotely from the Control Room.  With the ISS OFF, the PMC started and ended at:

• Pre-Alignment
  • PMC Trans: 108.0 W
  • PMC Refl: 17.3 W
• Post-Alignment
  • PMC Trans: 109.1 W
  • PMC Refl: 16.2 W

Some improvement, but not much.  With the ISS ON PMC Refl is unchanged and PMC Trans = 109.2 W; we did have to adjust the ISS RefSignal for the improvement in PMC Trans, it changed from -1.98V to -2.0V.  Moving on to the FSS RefCav, with ISS ON we started and ended at:

• Pre-Alignment TPD: 0.91 V
• Post-Alignment TPD: 0.92 V

Again, not much improvement, but some.  Also noting that the laser power out of both amplifiers is down a little bit (~2W on each), so it looks like it's getting close to time to adjust the pump diode operating currents; this could also be why we can't get much improvement with an alignment tweak (we've had higher PMC Trans and lower PMC Refl in the past), we could be seeing output mode chagnes due to the natural slow drop in pump diode power.  Will keep an eye on things.

We accepted the RefSignal change in the ISS safe.snap SDF, and also a couple of 2nd loop ISS diffs that we confirmed are the correct values when the IFO is down.  Ryan will attach the screeshots as a comment.