[PRad] Ashot, [Fwd: PRad ERR: Final Report]

Christopher Keith ckeith at jlab.org
Thu Dec 17 12:17:15 EST 2015

James Brock reconfigured the PRad target with two major modifications.
1.  The orifices in the target cell were reduced from 4 mm to 2 mm diameter.
2.  The orifices between the target chamber and the upstream/downstream 
chambers were moved closer to the target cell.

These had very positive effects, and reduced the measured "background" 
gas inside the target chamber from about 0.9% to about 0.07% of the gas 
contained within the cell.  This is the dominant source of background 
gas in the apparatus.

Please find some slides attached with this information.  The results of 
these recent modifications begin on slide 8.


Christopher D. Keith
Jefferson Lab, Suite 6          email: ckeith at jlab.org
12000 Jefferson Ave.            ph: 757-269-5878
Newport News VA 23606           fax: 757-269-5235

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