Reports until 20:27, Friday 14 August 2015
H1 ISC
sheila.dwyer@LIGO.ORG - posted 20:27, Friday 14 August 2015 (20543)
ALS X WFS gains increased

Our X arm green WFS took extremely long to converge (up to 8 minutes.)  While it was too windy to lock this afternoon gabriele and I increased the gain of ALS-X_WFS_DOF_1 and 2 by a factor of 3, now things should be faster.  A factor of 10 gain was too much, the loops became unstable.

We probably have not been waiting long enough for these loops to converge while doing inital alingment, hopefully things will go better now that they are a little higher gain.  However, it is still a good idea to watch the control signals to see when the converge.  Ed has put templates called XARM_GREEN_WFS and YARM_GREEN_WFS in ops/Templates/StripTools that can be used for this.