Oli, TJ, Sheila

There have been several locklosses over the last day from the LOWNOISE_ESD_ETMX state, which happened while the gain was ramping down ITMX darm control and ramping up ETMX control.  This is similar to what Elenna was trying to avoid by adjusting ramp times in 81260 and 81195, which was also at a time when the microseism was high.

Oli and I found that the problem with some of our transitions today was that the power on the DCPDs was dropping too low during the initial transition, we lost lock when it got to less than 1mA, in one of the sucsesful transitions it was as low as 4mA.  We edited the guardian to not turn off the darm boost (DARM1 FM1) before making the transition, and instead we are turning it off directly after transitioning control back to ETMX, before the other filter changes that happen in this state. 

This is the boost that we thought was causing locklosses when ramping off, 81638 which motivated Erik's quadratic ramping change 82263 which was then reverted 82284    82277.  Today Oli and I increased the ramp time on this filter from 10 to 30 seconds.  We have make the guardian wait the full 30 seconds for this ramp time, so this is making us wait longer in this state.

The attached screenshot shows the transition with the boost on on the left, and off on the right, the wiggle in the DCPD sum is about 1 mA rather than 15mA. 

Oli is thinking about adding a check for DCPD sum dropping low to the lockloss tool.