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

[gasparan at jlab.org]

  Thank you Chris for a very good result/news, This is a significant
 improvement for the experiment.

 Ashot


> 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.
>
>
> Chris
>
>
> --
> ______________________________________________________
> 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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