ISSN:
1089-7674
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Results from a time-dependent analysis of the electron–wave interaction in the output cavity of a frequency-doubling magnicon amplifier operating in X band are presented. The multiregion cavity contains a single rotating transverse magnetic, TM210, or transverse electric, TE211, eigenmode. The analysis models the synchronous interaction of electrons with the mode, allowing for slow-time evolution of the radio-frequency field due to a gyroresonant mechanism. The electrons entering the output cavity represent a beam that has been spun up by the gain cavities. For the case of an ideal beam in a simple, closed cavity, the optimized efficiencies for TM210 or TE211 operation are nearly the same (≈50% for a 1/2 MV, 180 A, α=1 beam, where α is the ratio of transverse to parallel velocity). For an ideal beam in the realistic field of the complex cavity system, the optimized efficiency for TM mode operation increases to ≈57%, while for TE operation it is reduced to ≈37%. With a finite beam radius of 2.75 mm, the TM210 mode efficiency is reduced, dropping to a value nearly the same as for an ideal beam in a closed cavity. For the TE211 mode, the finite radius has a minor effect on the efficiency obtained for the realistic cavity. The sensitivity of the TM210 mode efficiency to spreads in α, energy, and gyroangle is displayed graphically. © 1995 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.871371
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