stefan.ballmer@LIGO.ORG - posted 11:43, Saturday 06 June 2015 - last comment - 16:57, Saturday 06 June 2015(18931)
ASC control signals over 14h
Hang, Stefan Our lock is at 14h and counting. Attached are the output control signals for the 10 optics that are controlled by the ASC system. (All of them are relieved to the top mass, so the top mass output is what I am plotting.) There is some funny behaviour in PR2 pitch, and some of it also shows up in the BS pith nd yaw. Also - interestingly, the sharp rise in SR2 PITCH about 10.5h ago (2015/06/06 07:55 UTC) corresponds to a drop in the inspiral range by about 10% (6Mpc), and comes from the 80Hz to 300Hz region. Whatever this noise is, it seems to be related to SRC alignment. The third attached plot shows the difference between before that SR2 move (2015/6/6 7:32 UTC, 67Mpc) and after (2015/6/6 8:32 UTC, 61Mpc). Sounds like SRC ASC work is not done yet.
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Here are some plots of the AS_A_RF36 and AS_B_RF36 signals around the time of the SRC cavity shift (2015/06/06 07:55 UTC). PITCH: AS_B_RF36_I and AS_B_RF36_Q are servoed to zero - the don't see any jump. AS_A_RF36_I and AS_A_RF36_Q both show a clear jump at that time, so there is a good chance to find a better PIT error signal. YAW: The jump does show up in the two I sensors in YAW as well. While the current YAW input matri seems to work for stability (18h locks), I am still not sure about its lock-point. More work needed.
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