Computer simulations of frequency- and phase-locking of cavity magnetrons

Andreev, Andrey D.

doi:10.1080/09205071.2018.1452636

Cited by 12 publications

References 56 publications

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Review of the relativistic magnetron

Andreev

Kuskov

Schamiloglu

2019

Matter and Radiation at Extremes

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The cavity magnetron is the most compact, efficient source of high-power microwave (HPM) radiation. The imprint that the magnetron has had on the world is comparable to the invention of the nuclear bomb. High- and low-power magnetrons are used in many applications, such as radar systems, plasma generation for semiconductor processing, and—the most common—microwave ovens for personal and industrial use. Since the invention of the magnetron in 1921 by Hull, scientists and engineers have improved and optimized magnetron technology by altering the geometry, materials, and operating conditions, as well as by identifying applications. A major step in advancing magnetrons was the relativistic magnetron introduced by Bekefi and Orzechowski at MIT (USA, 1976), followed by the invention of the relativistic magnetron with diffraction output (MDO) by Kovalev and Fuks at the Institute of Applied Physics (Soviet Union, 1977). The performance of relativistic magnetrons did not advance significantly thereafter until researchers at the University of Michigan and University of New Mexico (UNM) independently introduced new priming techniques and new cathode topologies in the 2000s, and researchers in Japan identified a flaw in the original Soviet MDO design. Recently, the efficiency of the MDO has reached 92% with the introduction of a virtual cathode and magnetic mirror, proposed by Fuks and Schamiloglu at UNM (2018). This article presents a historical review of the progression of the magnetron from a device intended to operate as a high-voltage switch controlled by the magnetic field that Hull published in 1921, to the most compact and efficient HPM source in the twenty-first century.

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Review of the relativistic magnetron

Andreev

Kuskov

Schamiloglu

2019

Matter and Radiation at Extremes

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Internal-locking relativistic magnetron in transversely opposed driven scheme

Zhou,

Li,

Wang

et al. 2024

Physics of Plasmas

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A cascaded relativistic magnetron array with symmetric feeder structure was first proposed as a multi-port phase-coherent high-power microwave source, which is intrinsically equipped with high structural symmetry. Two symmetrically positioned slow-wave structures surround the feeder structure, which reduces axial electron drifting in each resonant system and ensures the phase-locking process. In this paper, a theory of structure-provided coupling coefficient and oscillator-required coupling coefficient is proposed as the phase-locking prerequisites. The method is evaluated by adopting two A6-type resonant systems. The symmetrically driven cascaded relativistic magnetron array employs a typical π-mode with an anode voltage of 450 kV and an axial magnetic field of 0.47 T. The phase-locked state was achieved in 17 ns with a jitter less than 5 deg. The total output power exceeds 2.3 GW at a frequency of 2.15 GHz, and the power flow in each output port exceeds 350 MW. The transversely opposed driven scheme can be combined with other phase-locking patterns for additional uses, and further optimization of resonant system could be applied for enhancing device performance. The theory of coupling prerequisites is also sufficient for analyzing other cascaded relativistic magnetrons.

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Research on Phase-Locking of Ten-Vane 2.45GHz Microwave Oven Magnetron

Tian

et al. 2023

2023 24th International Vacuum Electronics Conference (IVEC)

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Computer simulations of frequency- and phase-locking of cavity magnetrons

Cited by 12 publications

References 56 publications

Review of the relativistic magnetron

Review of the relativistic magnetron

Internal-locking relativistic magnetron in transversely opposed driven scheme

Research on Phase-Locking of Ten-Vane 2.45GHz Microwave Oven Magnetron

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