Kiwamu, Sheila, Terra, Corey, Matt, Lisa

We are still dominated by intensity noise, and it is unclear what is the main noise source at 100 Hz right now, but at least we went through mostly all of the other low noise steps, and the locking sequence now works up to the "nominal low noise" state. 

Sheila had put most of the tuning in the guardian already (see  here ); here are some modifications that we had to do to the code to make it run:
 BounceM0 definitions were added to ISC_GEN_STATES
 The settings for the ASC SRC1 loop were loaded, but the PITCH loop was actually not engaged, so I added that (the YAW loop still needs some work, so at the moment it is just left uncontrolled once the SRM dither lines are turned off)
  
 The coil driver switch was only switching one of the coil; we believe that's the reason why we had troubles with violin modes getting excited during several locking attempts earlier tonight. Matt fixed the code (and used "guardian -i" to test it)
 
And this is the list of the parameters that we changed:
 DARM gain is now 700; Kiwamu had changed it from 1400 after finding that the DARM loop had gain peaking, but the new setting was not properly coded in the guardian; 
 DSOFT gains were lowered to deal with a 2 Hz instability appearing in the ASC low noise transition: DSOFT PITCH from 0.5 to 0.2 and DSOFT YAW from 3 to 1 (now in the Guardian); 
MICH and SRCL feed forward tuning (I ended up with -15.9 for MICH and -1.3 for SRCL, gains are still to be fine tuned) 
 

We locked several times tonight and powering up to 50W has been very robust. Parametric instabilities have been taken care of during the whole day (Terra will comment on that, but I believe she has been using standard PI settings without the need of manually adjusting them). However, by looking at the control room monitors from the hotel, it looks like a couple of PI are about to unlock. On a positive side, the summary pages monitoring PIs are working (see for example https://ldas-jobs.ligo-wa.caltech.edu/~detchar/summary/day/20160917/isc/pi_15_5_khz/).

 Before leaving we had left the interferometer in Observing Mode @ 50W, intent bit set to enable detchar monitoring, with intensity noise dominating above 400 Hz. As yesterday, the coupling to DARM increased during the lock. PIs will break this lock. There is more low frequency noise reduction to be done, but it is not immediately clear what is the excess at 100 Hz right now. The calibration shouldn't be too off as Evan checked it recently, at least at high frequency. The range reported by SensMon is above 30 Mpc..