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Entry  Fri Aug 5 20:37:34 2011, jamie, Summary, General, Summary of today's in-vacuum work 
    Reply  Sat Aug 6 03:10:05 2011, Suresh, Summary, General, Summary of today's in-vacuum work ETMX_OSEMs.pngAfter_osem_adjustment.JPGBefore_osem_adj.JPG
       Reply  Sat Aug 6 13:38:02 2011, rana, Summary, General, Summary of today's in-vacuum work 
          Reply  Sun Aug 7 11:10:54 2011, Suresh, Summary, General, OSEM positioning 
    Reply  Sun Aug 7 14:01:58 2011, kiwamu, Update, Green Locking, X green beam re-aligned 
       Reply  Sun Aug 7 18:41:12 2011, Jenne, Update, Green Locking, X green beam re-aligned 
Message ID: 5130     Entry time: Sat Aug 6 03:10:05 2011     In reply to: 5127     Reply to this: 5131
Author: Suresh 
Type: Summary 
Category: General 
Subject: Summary of today's in-vacuum work 

The table below gives the OSEM positions as seen on the slow chanels C1:SUS-ETMX_{UL,UR,LL,LR,SD}PDMon

ETMX_OSEMs.png

Note that the side OSEM has the fast channel (OUTPUT) available and we used that to locate it.

When we began work the OSEMs were photographed so that we have a record of their locations till now.  It was difficult to get accurate estimate of the magnet offset inside the OSEM we could not see the screen on the camera while clicking.  We then took some pictures after finishing the work. These are given below

 

          Before_osem_adj.JPG         After_osem_adjustment.JPG

 

The picture of the left is from before OSEMs were moved. It can be seen that OSEMs are rotated to make sure that the magnets avoid touching the teflon sheets which hold the shadow sensors.  The picture on the right shows the positions of the OSEMs after we adjusted their positions.  This time we kept the teflon sheets vertical as shown to minimise the coupling between the Side and Axial directions.

We needed to reposition them once again after we moved the tower to the center of the table.

Pictures with more detail will be posted to the wiki later.

 

 

 

 

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