Reports until 01:19, Wednesday 28 January 2015
H1 SUS (DetChar, ISC, SEI)
rana.adhikari@LIGO.ORG - posted 01:19, Wednesday 28 January 2015 (16317)
RM maintenance

I touched up the RM suspension controls today. RM1 had been tripping its watchdog often during the engagement of the scripts which use the RMs to center the beams on the REFL WFS.

  1. Moved the RLP11 low pass filter into the damping filter banks. This is less aggressive than the 5 Hz Cheby low pass that was there and allows for more stable recovery from saturations. The damping gains were checked; seems reasonable.
  2. Turned on the LIMIT for the damping filter banks at 1000 counts. This is similar to what I did with the IM mirrors recently.
  3. With the DRMI aligned, I adjusted the alignment biases to center the beam on the REFL_A and REFL_B WFS.

Now, when the scripts turn these on the RMs do not trip and the beams are centered.

We have left the DRMI locked (on 1f), Guardian undisturbed starting around 1:13 AM for seismic performance evaluation.