10-30-08 GEM HRRL Photon Runs

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14 MeV photons

We are sending 14 MeV phtoton through a 4" thick brick wall collimator. A 4" Al brick in front of the HRRL exit port is used as a FC.

Vdrift= 3700 Volt

VGem=3400 IGem=815 microA

The scope trace below shows output when electron beam current is 18 mA.

10-30-08 18mAHRRL GEM strip8.png

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