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Entry  Fri Mar 6 00:59:13 2015, rana, Summary, IOO, MC alignment not drifting; PSL beam is drifting MCdrfit.png
    Reply  Fri Mar 6 19:54:15 2015, rana, Summary, IOO, MC alignment not drifting; PSL beam is drifting Untitled.png
    Reply  Thu Mar 19 16:58:19 2015, Steve, Summary, IOO, MC alignment not drifting; PSL beam is drifting driftingInputBeam2.jpg
       Reply  Fri Mar 20 10:51:09 2015, Steve, Summary, IOO, MC alignment not drifting; PSL beam is drifting eom4.jpgeom3.jpg
          Reply  Mon Mar 23 09:42:29 2015, Steve, Summary, IOO, 4" PSL beam path posts .75odSSpost.pdfMC_mml_trans_clamp.jpgPMCmmLn.jpg
             Reply  Thu Mar 26 10:41:06 2015, Steve, Update, IOO, The PMC is not clamped IMG_0001.JPGPMCstops.jpgPMCballv.jpg
Message ID: 11106     Entry time: Fri Mar 6 00:59:13 2015     Reply to this: 11112   11147
Author: rana 
Type: Summary 
Category: IOO 
Subject: MC alignment not drifting; PSL beam is drifting 

In the attached plot you can see that the MC REFL fluctuations started getting larger on Feb 24 just after midnight. Its been bad ever since. What happened that night or the afternoon of Feb 23?
The WFS DC spot positions were far off (~0.9), so I unlocked the IMC and aligned the spots on there using the nearby steering mirrors - lets see if this helps.

Also, these mounts should be improved. Steve, can you please prepare 5 mounts with the Thorlabs BA2 or BA3 base, the 3/4" diameter steel posts, and the Polanski steel mirror mounts? We should replace the mirror mounts for the 1" diameter mirrors during the daytime next week to reduce drift.

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MCdrfit.png
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