Abstract

A method is explored for characterizing the energy distribution of an electron beam in vacuum. A thin (125 μm) tungsten foil intercepts the beam causing its temperature to rise. An infrared camera images the opposite side of the foil to map the temperature distribution. To the extent the thermal conduction can be neglected, the temperature distribution serves as a representation of the energy distribution of the incident electron beam. Design of experiments (DOE) methodology is used to develop an equation for predicting the shape of the temperature distribution based on the potential of a single electrostatic lens (−1000 V to 0 V) and that of the tungsten foil (0 V to 2000 V). An assessment of this technique’s utility for future electron beam characterization experiments is included.

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