Design of low velocity-spread cusp guns for axis encircling beams

Lawson, W.
May 1987
Applied Physics Letters;5/25/1987, Vol. 50 Issue 21, p1477
Academic Journal
The design of a novel electron gun suitable for intense beam cyclotron resonance devices is introduced here. An annular Pierce-type gun is used in conjunction with an unbalanced nonadiabatic field reversal and an adiabatic compression region to produce an axis-encircling beam. This beam is ideally suited for interaction with electromagnetic waves that have strong on-axis electric fields (e.g., the TE011 mode). Low velocity spreads are achieved by utilizing the beam self-fields in the compression region and by focusing in the Pierce gun.


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