10-30-08 GEM HRRL Photon Runs

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.