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Entry  Sat Sep 8 00:04:53 2012, Jenne, Update, General, Beam scan measurement plan - to do Monday morning. 
    Reply  Mon Sep 10 08:50:35 2012, Steve, Update, General, Beam scan measurement plan - to do Monday morning. 
    Reply  Mon Sep 10 19:04:32 2012, rana, Update, General, plan 
Message ID: 7371     Entry time: Mon Sep 10 19:04:32 2012     In reply to: 7367
Author: rana 
Type: Update 
Category: General 
Subject: plan 

 On Friday, Koji and I adjusted the beam pointing into the DRMI using the PZT yaw and found that the beam inside the DRMI (as seen on the AS camera) looked OK (not distorted too much).

So it seems that the issue seen before, namely that the DRMI resonant mode is very strange, is no longer true.

The camera image at the AS port still looks elliptical. So Jenne and Mike have started to make this beam round by adjusting the lenses.

Our plan now is:

1) Fix AS camera optics to get a round beam (single bounce off of ITMY).

2) Flash DRMI to make sure the beam at AS is still round.

3) Using the moveable Watec camera and Sensoray, get images of the spot on all DRMI mirrors with DRMI flashing. Use targets and rulers whenever possible to get quantitative measurements of the beam positions. (i.e. just saying "Oh, its pretty much in the center" is the Mickey Mouse approach to science)

4) Align all pickoff beams in this situation. Make sure there is no in vac clipping. Align IP POS and ANG using this input beam pointing.

5) Pump down.

 

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