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Entry  Mon Jun 3 22:36:07 2013, rana, Update, LSC, ALS-TRY_OUT needs anti-whitening try.pdf
    Reply  Tue Jun 4 16:04:34 2013, Annalisa, Update, LSC, ALS-TRY_OUT needs anti-whitening 
       Reply  Tue Jun 4 17:28:09 2013, Annalisa, Update, LSC, C1:ALS-TRY_OUT filter and green progress green.JPGQUAD1_1054358327.mp4
          Reply  Tue Jun 4 21:50:23 2013, Annalisa, Update, LSC, C1:ALS-TRY_OUT filter and green progress 
             Reply  Wed Jun 5 14:01:37 2013, rana, Update, LSC, C1:ALS-TRY_OUT filter and green progress 
                Reply  Wed Jun 5 15:03:42 2013, Annalisa, Update, LSC, C1:ALS-TRY_OUT filter and green progress faraday_rejected_beam.JPG
    Reply  Wed Jun 5 14:43:42 2013, Annalisa, Update, LSC, ALS-TRY_OUT DQ channels 
Message ID: 8667     Entry time: Mon Jun 3 22:36:07 2013     Reply to this: 8671   8679
Author: rana 
Type: Update 
Category: LSC 
Subject: ALS-TRY_OUT needs anti-whitening 

 After working some more on the EY table, we are getting some TEM00 flashes for the Y arm green. We have had to raise the height of one of the MM lenses to prevent clipping.

We used a function generator to apply a ~300 mV 10 Hz triangle wave to scan the laser frequency while aligning.

We tried to use the C1:ALS-TRY_OUT channel to help us in our alignment but there are a couple problems:

1) It seems that there is an uncompensated whitening filter before the ADC - Annalisa is making a compensation filter now.

2) The data delay is too much to use this for fast alignment. We might need to get a coax cable down there or mount a wired ethernet computer on the wall.

3) We need to make DQ channels for the TRY and TRX OUT. We need long term data of these, not just test points.

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