Design of a high energy x-ray imaging system for the Tandem Mirror Experiment-Upgrade

The authors want to image the hot, mirror-confined electrons produced by electron cyclotron resonant heating in the end cells of the Tandem Mirror Experiment-Upgrade. Preliminary spectroscopic measurements with NaI(Tl) detectors indicate tail electron temperatures in the range of 100-300 keV. Their goal is to image x rays in the energy range 10-200 keV, for plasma densities as low as 1011 cm-3. A spatial resolution of one part in forty at framing rates of 200 Hz should be achieved. The imaging system will consist of an x-ray converter (phosphor or scintillator) and image intensifier (diode or microchannel plate), followed by a video readout (silicon intensifier tube). They will outline the steps they are taking to implement this system