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Grid‐controlled plasma cathodes

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6 Author(s)
Humphries, S. ; Accelerator Technology Program, Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131 ; Coffey, S. ; Savage, M. ; Len, L.K.
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Experiments are described on a plasma cathode with biased grids to prevent entry of ions into the electron extraction gap. The cathode has potential applications to the generation of high‐current pulsed electron beams. Operation at 20 A/cm2 is theoretically possible. The source combines the low average power consumption of a plasma cathode with many of the attractive features of thermionic cathodes, such as space‐charge‐limited extractor gap electron flow, fast turn‐on, and no diode closure. Initial experiments are reported at the 2 A/cm2 level for pulse lengths to 160 μs.

Published in:

Journal of Applied Physics  (Volume:57 ,  Issue: 3 )