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An injector has been built at the University of Maryland which produces a hollow cylindrical beam of relativistic electrons. The design uses a low-impedance pulse generator and step-up, transmission-linetransformer to drive a high-impedance, field-emission electron gun. This paper reviews the design of the pulse generator and performance of the pressurized gas switches. The transformer and electron gun design is also described and results are given for the initial tests of the injector with a 2-MeV, 6-kA beam.
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Burton et al. (1973) studied this question.
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