Experimental study demonstrates electron beam transport exceeding the vacuum space-charge limit in a gyrotron setup, indicating plasma neutralization can enhance high-power microwave devices.
Experimental results are reported on the transport of an electron beam with current in excess of the vacuum space-charge-limited value, in a configuration directly applicable to gyrotron oscillators. The vacuum space-charge limit is circumvented by the introduction of a neutralizing background plasma which is produced by an array of four plasma guns placed immediately downstream of the electron gun anode.
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Kirkpatrick et al. (1990) studied this question.
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