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Message ID: 5283     Entry time: Tue Aug 23 02:03:04 2011
Author: Suresh 
Type: Update 
Category: IOO 
Subject: MC realigned and spot positions recentered 

After the MC1 and MC3 OSEMs were  repositioned  MC had to be realigned and the beam spots had to be recentered on the actuation nodes.  

To do that I had to change the input beam direction into the MC  and the coil offsets.   

I also measured the resultant spot positions

spot positions in mm (MC1,2,3 pit MC1,2,3 yaw):
    0.1354   -0.2522   -0.1383   -1.0893    0.7122   -1.5587

mcdecenter20110822.png

 

The MC1 and MC3 yaw can be improved further after the chambers are closed and evacuated.  The PZT adjustments needed to realign the input beam pointing are quite small and should not pose a problem.

 

 

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