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Entry  Tue Sep 18 20:32:42 2012, Manasa, Configuration, PSL, AOM installation 
    Reply  Wed Sep 19 11:39:37 2012, Manasa, Configuration, PSL, AOM installation ALC_25.png
       Reply  Wed Sep 19 15:41:27 2012, Manasa, Configuration, PSL, AOM installation 
          Reply  Wed Sep 19 23:17:25 2012, rana, Configuration, PSL, AOM installation 
             Reply  Thu Sep 20 01:29:04 2012, Manasa, Configuration, PSL, AOM installation TEK00000.PNG
                Reply  Fri Sep 21 12:12:56 2012, Manasa, Configuration, PSL, AOM installation PSL.png
                   Reply  Tue Oct 2 16:15:22 2012, Manasa, Configuration, PSL, AOM installation psl_aom.png
                      Reply  Wed Oct 3 16:52:16 2012, Manasa, Configuration, PSL, AOM installation 
                         Reply  Wed Oct 3 23:36:54 2012, Koji, Configuration, PSL, AOM installation PMCTRANS.png
                            Reply  Thu Oct 4 17:54:59 2012, Manasa, Configuration, PSL, AOM installation 
                               Reply  Thu Oct 4 18:48:04 2012, janosch, Configuration, PSL, AOM installation 
                                  Reply  Thu Oct 4 20:57:43 2012, Manasa, Configuration, PSL, AOM installation 
                                     Reply  Thu Oct 4 22:16:28 2012, Koji, Configuration, PSL, AOM installation 
                                        Reply  Fri Oct 5 18:08:17 2012, Manasa, Configuration, PSL, AOM installation 
Message ID: 7479     Entry time: Thu Oct 4 17:54:59 2012     In reply to: 7474     Reply to this: 7480
Author: Manasa 
Type: Configuration 
Category: PSL 
Subject: AOM installation 

Quote:

After the AOM work the beam wasn't well aligned to the PMC. The PMC REFL CCD shows large misalignment in yaw.

 {Jan, Manasa, Den}

We wanted to align the PMC and followed Koji's procedure detailed to us by mail. We touched the 2 steering mirrors in front of the PMC for alignment.

- Stand in front of the PMC.
- Find an oscillosocpe on the shelf in the PSL enclosure.
- This has two signals connected. One is the PMC refl dc.
  The other is the PMC trans dc.
- Minimize the refl. Maximize the trans.
- You have the CRT monitor on the MC chamber.
- Project the image of the PMC refl CCD.
  This should show some what symmetric image like an LG mode.
- Use the dataviewer to see how C1:PSL-PMC_PMCTRANSPD is recovered.

We were able to obtain 0.7 at PMC trans; but the PMC was never really stable dropped from 0.7 to 0 abruptly from time to time.

Jenne and Jamie also find that the PMC is behaving very weird 

Summary: Problem unresolved 

 

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