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Entry  Wed Feb 13 19:09:32 2013, yuta, Summary, General, possible explanations to oval REFL beam REFL_1044844506.bmp
    Reply  Wed Feb 13 19:30:45 2013, Koji, Summary, General, possible explanations to oval REFL beam 
       Reply  Wed Feb 13 19:41:07 2013, yuta, Summary, General, possible explanations to oval REFL beam 
    Reply  Wed Feb 13 22:09:26 2013, Jenne, Update, Alignment, REFL is not clipped 
       Reply  Thu Feb 14 00:10:12 2013, yuta, Summary, Alignment, REFL is not clipped 
          Reply  Thu Feb 14 10:42:41 2013, Jamie, Summary, Alignment, MMT, curved TTs does not explain beam ellipticity at Faraday T.pdfS.pdf
Message ID: 8079     Entry time: Wed Feb 13 19:30:45 2013     In reply to: 8078     Reply to this: 8080
Author: Koji 
Type: Summary 
Category: General 
Subject: possible explanations to oval REFL beam 

>> "What has changed since:"

Recently the REFL path has been rearranged after I touched it just before Thanksgiving.
(This entry)

If the lenses on the optical table is way too much tilted, this astigmatism happens.
This is frequently observed as you can find it on the POP path right now.

Also the beam could be off-centered on the lens.

I am not sure the astigmatism is added on the in-air table, but just in case
you should check the table before you put much effort to the in-vacuum work.

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