Observation of the diocotron instability in a diode with split cathode

In this article, the diocotron modes developing in a coaxial diode and the resonant magnetron modes forming in a six-vane A6 relativistic magnetron both fed by a split cathode are studied by Particle-in-Cell simulations. The split cathode is a novel type of cathode which sustains a column longitudinally oscillating electrons in a coaxial diode (smooth bore) or a magnetron over a non-emitting axial cathode conductor. The connection between the longitudinal oscillatory dynamics and the diocotron or magnetron mode development, as well as whether the diocotron modes affect the magnetron modes, is investigated.

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Diocotron and electromagnetic modes in split-cathode fed relativistic smooth bore and six-vane magnetrons

Leopold

Bliokh

Krasik

et al. 2023

Physics of Plasmas

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Characterizing the high-power-microwaves radiated by an axial output compact S-band A6 segmented magnetron fed by a split cathode and powered by a linear induction accelerator

Belozerov

Krasik

Leopold

et al. 2023

Journal of Applied Physics

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In a recent publication [J. Appl. Phys. 131, 023301 (2022)], microwave generation by a segmented A6 S-band axial output relativistic magnetron (RM) fed by a split cathode and powered by a small pulsed power generator was demonstrated for the first time. In the present article, we add to the same RM a mode converter and an antenna and drive it by using a modified linear induction accelerator (LIA) (≤450 kV, ≤4 kA, ∼150 ns). It was found that the operation of the RM for a split cathode or a common explosive emission cathode differs significantly. For a split cathode, we optimize for the best microwave output, its geometrical parameters, the external magnetic field, and the LIA's charging voltages. For the optimal choice of these parameters, the RM generates ∼160 ns long microwave pulses of ∼130 MW, 1.78 GHz frequency with an electronic efficiency of ∼40%, without pulse shortening. On the other hand, a common solid cathode fed RM showed microwave pulse shortening. We demonstrated that the segmented anode allows using a μs-timescale magnetic field, making it possible for the RM to operate repetitively.

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Observation of the diocotron instability in a diode with split cathode

Cited by 2 publications

References 22 publications

Diocotron and electromagnetic modes in split-cathode fed relativistic smooth bore and six-vane magnetrons

Diocotron and electromagnetic modes in split-cathode fed relativistic smooth bore and six-vane magnetrons

Characterizing the high-power-microwaves radiated by an axial output compact S-band A6 segmented magnetron fed by a split cathode and powered by a linear induction accelerator

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