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Message ID: 1665     Entry time: Wed Jun 10 09:06:12 2009
Author: steve 
Type: Update 
Category: PEM 
Subject: particle counts and turbulance 

I moved the mobile HEPA filter from ITMX's north door to ITMX-ISCT and covered it up with a merostate tent to accommodate the aluminum foil particle measurement on June 5

It lowered the 40m baseline counts by about a factor of 3 of 0.5 micron and a factor of 2 of 1.0 micron.

The HEPA filter is sweeping the floor and blowing the particles upwards. The MET ONE counter is on the top of the IOOC looking south at ~75 degrees upward.

 

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