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Entry  Tue Feb 21 16:10:29 2012, kiwamu, Update, IOO, degradation in input PZT1 
    Reply  Mon Mar 5 03:50:49 2012, kiwamu, Update, IOO, PZT1 PITCH railing 
       Reply  Mon Mar 5 17:07:58 2012, kiwamu, Update, IOO, realigned MC 
          Reply  Thu Mar 8 23:37:03 2012, kiwamu, Update, IOO, dither Y arm dither script 
          Reply  Wed Mar 14 04:03:37 2012, kiwamu, Update, IOO, PZT1 and associate extra works 
Message ID: 6300     Entry time: Tue Feb 21 16:10:29 2012     Reply to this: 6351
Author: kiwamu 
Type: Update 
Category: IOO 
Subject: degradation in input PZT1 

PZT1, the one with Koji's custom mid-HV driver (#5447), is getting degraded.

The movable range in the pitch direction became narrower than what it used to be (maybe a factor of 3 estimated by looking at the beam spots).

I think we should raise the priority level of the active TTs for the next vent.


I have been having a feeling that the PZT1 response is getting smaller since the end of the last year, but now I am confident

because I could see the difference between the movable ranges of Yaw and Pitch, and they used to have approximately the same amount of the movable ranges.

Right now this is not a serious issue as the beam pointing determined by the MC alignment is so good that the Pitch range doesn't rail.

I won't be surprised if it becomes completely immovable in 3 month.

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