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A cosmic ray struck the RFM in the framebuilder this afternoon, causing hours of consternation. The whole FE system is just now coming back up, and it appears the mode cleaner is not coming back to the same place (alignment).
rob, jenne
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Jenne, Rana, Koji
The mode cleaner has been realigned, using a combination of techniques. First, we used ezcaservo to look at C1:SUS-MC(1,3)_SUS(DOF)_INMON and drive C1:SUS-MC(1,3)_(DOF)_COMM, to put the MC1 and MC3 mirrors back to their DriftMon values. Then we looked at the MC_TRANS_SUM on dataviewer and adjusted the MC alignment sliders by hand to maximize the transmission. Once the transmission was reasonably good, we saw that the spot was still a little high, and the WFS QPDs weren't centered. So Koji and I went out and centered the WFS, and now the MC is back to where it used to be. The MC_TRANS QPD looks nice and centered, so the pointing is back to where it used to be. |