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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: 2107     Entry time: Fri Oct 16 18:46:36 2009     In reply to: 2105     Reply to this: 2109
Author: rana 
Type: Configuration 
Category: ASC 
Subject: loop opened on PZT2 YAW at 3:40 pm 

Quote:

I pushed the "closed loop" button on PZT2 YAW around 3:40 pm today, then roughly recentered it using the DC Offset knob on the PiezoJena controller and the IP ANG QPD readbacks.  There was a large DC shift.    We'll watch and see how much it drifts in this state.

 Here's the trend.

The transient at ~22:40 is Rob switching to 'Open Loop' on the Piezo Jena PZTs. I don't see any qualitative change in the drift after this event.

At 05:55 UTC, I removed an iris that was blocking the IP POS beam (the sum goes up from 2 to 6.5) without disturbing the mirrors who's oplev beam are on that table. Steve has conceded one sugar Napoleon after betting against my ninja-like iris skills.

We should recenter the beam on IP POS now that its unclipped - I'll let it sit this way overnight just to get more drift data.

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