J. Oberling, R. Short
While recovering the PSL after the chiller swap this morning (alog82379), we noticed the alignment of the PMC and RefCav looked poor according to the cameras, so we took the time to touch these up while still in the maintenance period. Starting with the PMC, I was able to slightly improve the alignment using the picomotors:
| Start (W) | End (W) | |
| PMC Trans | 102.5 | 103.0 |
| PMC Refl | 25.3 | 24.8 |
Moving on to the RefCav, once the FSS was locked I was able to improve the alignment here as well; the TPD signal increased from 620mV to 737mV. Not as much gain here as we hoped, and the RefCav Refl camera spot still looks like two vertical lobes, so the FSS path may need to be adjusted on-table.
Finally, since the output of the PMC had increased, I changed the ISS RefSignal to bring the diffracted power back down to our desired setpoint of around 4%.