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Entry  Sun Aug 7 14:11:53 2011, Jenne, Update, PEM, Particle counts through the roof ParticleCount_High_7Aug2011.png
    Reply  Mon Aug 8 14:21:03 2011, steve, Update, PEM, Particle counts controlled P1080149.JPGP1080150.JPG
Message ID: 5140     Entry time: Mon Aug 8 14:21:03 2011     In reply to: 5134
Author: steve 
Type: Update 
Category: PEM 
Subject: Particle counts controlled 


[Jenne, Kiwamu]

While Kiwamu was finalizing the X green alignment, I started to prepare to remove the ETMY door, and begin checking out its OSEMs, etc, so we could start moving it to it's new place, and figure out why it's been wonky for a while.  I ran the particle counter, and we have a factor of ~5 more particles than normal.  Kiwamu and I agreed not to open ETMY.  Since we had briefly opened the IOO and Output Optics chambers to check the X green's position on the PSL table, we immediately shut those doors.  They were probably open for ~15 minutes or so.  (Yes Steve, we should have checked before opening any doors, but at least we remembered to check at all, and the doors were only open for a few minutes rather than for a few hours.)

I attach a 24hrs trend of the particle counts, for reference.  It looks like it's been a little high for a while, but today it's really dirty in the air.

 The east end particle count is 155K for 0.3 micron and 15K for 0.5 micron  counts/cf min.  In order to minimize diffusion of dirt into the IFO we set up the mobile HEPA with CP Stat 100 tent.

This set up gives us practically ZERO inside the tent

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