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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: 8680     Entry time: Wed Jun 5 15:03:42 2013     In reply to: 8677
Author: Annalisa 
Type: Update 
Category: LSC 
Subject: C1:ALS-TRY_OUT filter and green progress 

Quote:

The rejected beam from this Faraday comes out at a tiny, tiny angle and so its tough to pick it off without clipping the main beam.

Some care must be taken in setting this up - Steve may have some good ideas on what kind of mount can be placed so close to the beam.

Why did we ever order this terrible Faraday? Let's never get a Faraday with a tiny angle between the beams again.

The rejected beam from the Faraday is steered with a mirror into the PDA32A PD  and a 75mm fl lens is used to focus the beam into it.

The main beam is a few millimeters away from the mirror mount (maybe 2mm), and I think it should be fine as long as the main beam is not supposed to move.

 

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