SHAPED FIELD HOLLOW BEAM ELECTRON GUNS FOR INTERMEDIATE AND HIGH POWER TRAVELING WAVE TUBES.
Interim engineering rept. no. 3, 1 Nov 64-1 Feb 65.
SPERRY RAND CORP GAINESVILLE FLA SPERRY ELECTRONIC TUBE DIV
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Experiments with the multi-segment electron gun are made with no anode bias and with anodes biased linearly and parabolically. Biasing of the anodes produced beams more nearly in accordance with the objectives. It is found that positive flux linkage is very desirable. Electrolytic tank studies which modeled the anode biases used have shown that a portion of the cathode was subject to a negative electric field and thus cutoff. The computer program for gun analysis is essentially complete and is described in detail. Theoretical studies show that positive flux linkage favors rapid turning of electrons toward the exit end of the gun. It is also shown that shaping of the electric field so as to create an electric force toward the exit end of the gun results in a continuous variation in cathode current density, the density decreasing with increasing distance from the exit end of the gun. Author