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.
The scope trace below shows output when electron beam current is 36 mA.
The scope trace below shows output when electron beam current is 9 mA.
Now Max Gain on GEM
Vdrift= 3800 Volt
VGem=3500 IGem=841 microA
The scope trace below shows output when electron beam current is 9 mA.
The scope trace below shows output when electron beam current is 4 mA.
14 MeV photons
The scope trace below shows output when electron beam current is 4 mA.