Pep C. Thomas V. Jenne D.

After heroic efforts to successfully dampen the violin modes and get to NLN, the BNS range sat around 55 MPC so Jenne thought it would be a good to optimize the beam position in the arm cavities to match the pre-Montana-Earthquake.

This is done by first changing the A2L gain coefficients to what they were on June 17th 02:00:00 when Sheila was able to achieve better BNS range, and then turning on the dither scripts that show the length to darm coupling found in userapps/isc/common/scripts/decoup/setA2lines.py.  We then adjust the CSOFT and DSOFT loop offsets to minimize the dither resonances, which effectively moves the spot position back to what Sheila's settings were in mid-June.  After doing this, there seems still be the same amount of jitter noise at low freq ~10-80Hz.

However, it seems that the input pointing from the IMC has also shifted since the earthquake according to Cheryl's ALOG and we were messing with the IMC loop DOFs to adjust the WIT sensors back to their pre-EQ values, this proved to hurt our sensitivity a bit so we might need to spend more time fine-tuning this approach.

Because we haven't really improved the sensitivity, we changed the A2L gains back to their values on July 12th 01:06:22 and going to a more stable lock state.