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Wed Aug 22 18:58:12 2012, Jenne, Update, PEM, Weird BLRMS increase
Thu Aug 23 00:18:54 2012, Jenne, Update, PEM, Weird BLRMS increase
Thu Aug 23 10:08:13 2012, Steve, Update, PEM, seismometers?
Thu Aug 23 00:18:54 2012
In reply to:
Weird BLRMS increase
While I was gone for dinner break, the BLRMS went back to normal. Then, almost 2 hours later, another peak appeared, this time closer to 1Hz. Den noticed that it was hard to maintain any lock, since the optics were ringing up so much.
The MC was moving pretty significantly, and just to check, I turned off the WFS for a moment. The MC transmitted power was fluctuating by almost 50% until I turned the WFS back on.
Attached is a spectrum of the BS OSEM sensors. The higher frequency peak around 1.65Hz is from the time I posted the time series about earlier. The lower frequency peak around 1.15Hz is from the second interval of noise.
Now, the noise is gone, and things are back to normal (for now....)