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Entry  Mon Jul 22 16:30:31 2013, Koji, Update, General, Vent preparation 
    Reply  Mon Jul 22 16:56:14 2013, Jenne, Update, General, Vent preparation - In progress 
       Reply  Mon Jul 22 17:03:25 2013, Jenne, Update, General, MC spot positions MCdecenter_22July2013.png
          Reply  Tue Jul 23 04:26:54 2013, Jenne, Update, General, MC spot positions MCdecenter_22July2013_lowpower.png
       Reply  Mon Jul 22 18:49:16 2013, Jenne, Update, General, Vent preparation - In progress 
       Reply  Mon Jul 22 21:23:04 2013, manasa, Update, General, Vent preparation - In progress 
          Reply  Tue Jul 23 03:10:57 2013, Koji, Update, General, Vent preparation - In progress OSEM_RECORD.pngOPLEVS.png
          Reply  Tue Jul 23 03:43:32 2013, manasa, Update, General, Vent preparation - In progress 
             Reply  Tue Jul 23 04:22:03 2013, Koji, Update, General, Vent preparation - In progress 
       Reply  Tue Jul 23 04:31:36 2013, Jenne, Update, General, Vent preparation - Ready for Vent 
          Reply  Tue Jul 23 08:21:31 2013, Steve, Update, VAC, Vent has started beforVent.pngstartVent.png
             Reply  Tue Jul 23 14:00:03 2013, Steve, Update, VAC, the vent is completed Atm.png5cyl.pngventSum1d.png
Message ID: 8902     Entry time: Tue Jul 23 04:26:54 2013     In reply to: 8891
Author: Jenne 
Type: Update 
Category: General 
Subject: MC spot positions 

After Koji and I lowered the power into the PMC and saw that the MC locked nicely, I remeasured the spot positions (no alignment on the PSL table, or of the MC mirrors has been done.  Also, WFS are off, since there isn't any power going to them).

spot positions in mm (MC1,2,3 pit MC1,2,3 yaw):
[1.1999406656184595, 0.63492727550953243, 1.0769104750021909, -1.0260011922577466, -1.059439987970527, -1.2717741991488549]

MCdecenter_22July2013_lowpower.png

The spot positions seem to have actually gotten a bit better in pitch (although between 2 consecutive measurements there was ~0.5mm discrepancy), and no real change in yaw.  This means that Rana was right all along (surprise!), and that decreasing the power before the PMC reduces alignment pain significantly.

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