The rf acceleration of moderate current (≲1 A) electron beams to 500 keV in a TE111 cylindrical cavity resonator is described. Experimental results are compared with theory. rf to beam energy conversion efficiencies in excess of 50% have been observed. The resultant axis-encircling beam with a large ratio of perpendicular velocity to longitudinal velocity is ideal as a driver for a high-harmonic gyrotron.
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McDermott et al. (1985) studied this question.
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