jim.warner@LIGO.ORG - posted 14:57, Tuesday 17 March 2015 - last comment - 11:03, Wednesday 18 March 2015(17309)
BRS restarted this afternoon
Hugh and Krishna had found the BRS software had crashed pretty much on schedule, so Sheila and I went to the end-station to restart it. Pretty straightforward. Alogs 13817 and 15005 will get you everything you need to do it. The BRS is rung up right now because we went out to check the mass damper positions, but it should settle down in 30 minutes or so.
K. Venkateswara
I took a look at the BRS_RY_IN channel and it looks like BRS started to get damped but then the damping failed (see attached pic). It is currently oscillating with 500 count ampitude. I'm not sure why this happened but it currently looks like the mean position of the damping turn-table has changed by 45 degrees causing it to neither damp nor drive BRS. A repositioning of the turn table might help. If not, I'd suggest turning off the damper temporarily.
Looks like Jim and Sheila did everything right, but the damper is a bit finicky.
Looks like it did damp down eventually. I have no idea what happened, but it is possible that the damper turn-table got stuck, moved to a new mean location and then somehow got stuck again and returned to a reasonable location. In any case, looks like BRS is damped now and working well.