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Abstract
A high-energy electron beam is generated using gas-ionizing collisions to amplify a small cathode filament current. The technique makes use of a crossed magnetic and electric field to reduce the effective mean free path of electrons at the cathode. At a pressure of 5×10−5 Torr helium, for example, a filament current of 0.4 mA will produce a uniform beam of 100 mA. Accelerating voltages up to 100 kV are used.
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