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Entry  Fri May 28 21:32:32 2010, Alberto, Update, 40m Upgrading, MC alignment 
    Reply  Fri May 28 23:21:52 2010, Koji, Update, IOO, MC alignment 
       Reply  Mon May 31 00:10:18 2010, kiwamu, Update, IOO, MC alignment 
          Reply  Mon May 31 03:38:48 2010, Koji, Update, IOO, MC alignment MC_spot_centering.png
             Reply  Mon May 31 17:47:34 2010, kiwamu, Update, IOO, today's plan : MC alignment 
Message ID: 3020     Entry time: Mon May 31 03:38:48 2010     In reply to: 3019     Reply to this: 3021
Author: Koji 
Type: Update 
Category: IOO 
Subject: MC alignment 

Remember that you only can introduce the axis translations from the PSL table.
It is quite difficult to adjust the axis rotation.

The calibration factor from A2L results to the beam position is dx = (A2L_result - 1) *10.8mm

If I believer the result below, the spot positions on the mirrors are

MC1 Pitch      -1.1mm
MC1 Yaw        -0.20mm
MC3 Pitch      -1.5mm
MC3 Yaw        +0.35mm

This means that the beam is 1.3mm too high and 0.28mm too much in north

This corresponds to tilting SM2 by
0.33mrad in pitch (23deg in CW)
and
0.10mrad in yaw (7deg in CW).

Quote:

C1:SUS-MC1_ULPIT_GAIN =  0.900445
C1:SUS-MC1_ULYAW_GAIN =  0.981212
C1:SUS-MC3_ULPIT_GAIN =  0.86398

C1:SUS-MC3_ULYAW_GAIN =  1.03221  

 

Attachment 1: MC_spot_centering.png  156 kB  | Show | Show all
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