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Entry  Fri Oct 16 16:08:00 2009, rob, Configuration, ASC, loop opened on PZT2 YAW at 3:40 pm 
    Reply  Fri Oct 16 18:46:36 2009, rana, Configuration, ASC, loop opened on PZT2 YAW at 3:40 pm Untitled.png
       Reply  Sun Oct 18 16:09:34 2009, rana, Configuration, ASC, loop opened on PZT2 YAW at 3:40 pm a.png
Message ID: 2109     Entry time: Sun Oct 18 16:09:34 2009     In reply to: 2107
Author: rana 
Type: Configuration 
Category: ASC 
Subject: loop opened on PZT2 YAW at 3:40 pm 

 

I wanted to see how long our IP POS beam has been badly clipped - turns out its since April 1, 2007.

Steve's April Fool's joke is chronicled then. The attached trend shows that the drop in IP POS is coincident with that event.

In trying to align IPPOS, I noticed that someone has placed a ND2.0 filter (factor of 100 attenuation) in front of it. This is kind of a waste - I have removed IPPOS to fix its resistors and avoid this bad optic. Also the beam coming onto the table is too big for the 1" diameter optics being used; we need to replace it with a 2" diamter optic (Y1-2037-45P).

 

IP ANG dropped by a factor of 2 back in early August of '08.

We need this guy on the investigation:

 

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