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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: 7494     Entry time: Fri Oct 5 18:08:17 2012     In reply to: 7482
Author: Manasa 
Type: Configuration 
Category: PSL 
Subject: AOM installation 

Quote:

Do more investigation to understand what is causing the power reduction.

Is the alignment inadequate? Check the in-lock ccd image.

Is the incident power reduced? (by what?) Use dataviewer.

Is the AOM doing something? Is it active? Then how much power is it eating?

BY THE WAY, how the deflected beam is dumped?
If you don't have anything for blocking the 1st order beam, you have to expect Steve coming to you.

The PMC has been aligned and is all happy happy 

I have installed an  iris to dump the higher order beams deflected by the AOM. After installing the iris, I found that the PMC trans dropped to 0.58V and the PMC misaligned in pitch. So I've touched the 2 steering mirrors before the PMC. Now it is satisfactorily locked with PMC trans at 0.84.

I have also checked the alignment with AOM switched on. PMC trans drops to 0.15 with AOM on and comes back to 0.84 when AOM is switched off without losing lock .

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