cheryl.vorvick@LIGO.ORG - posted 15:46, Wednesday 18 November 2015 - last comment - 21:47, Wednesday 18 November 2015(23532)
Initial alignment X arm red locking gain increased
I edited lscparams.py to set the initial alignment X arm IR gain higher, to match the gains we're having to enter manually to get the arm to lock in red.
Included below are the line I changed, and the previous comments.
arm_IR_gain['X'] = 0.15 # was 0.05 and doesn't lock, bumped up to 0.15, CV 18 Nov 2015
#was 0.08 until August 18 2015 # was 0.12 as of Apr-16-2015 and bit too high
#arm_IR_gain['X'] = 0.2 #should be 0.2 to acquire lock
Later today, we set the gain back to the nominal of 0.05 since it was too high and the servo ran in to a loop instability. See alog 23543.