A High-Efficiency Megawatt-Class Nonrelativistic Magnetron

Numerical simulations of a prototype conventional magnetron capable of an RF output power exceeding 1.3 MW at peak efficiency greater than 87% for relatively low diode voltages of ~ 40 kV are presented. Virtual prototyping of the magnetron design is carried out on massively parallel architecture uti...

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Published in:IEEE transactions on plasma science 2012-09, Vol.40 (9), p.2112-2118
Main Authors: Fleming, T. P., Lambrecht, M. R., Mardahl, P. J., Keisling, J. D.
Format: Article
Language:English
Subjects:
Anodes
Cathodes
Conventional magnetron
Electric currents
Electromagnetics
Electrons
high-power microwave
Magnetic fields
Magnetic resonance
Magnetic resonance imaging
Magnetomechanical effects
mode competition
Radio frequency
Saturation magnetization
Simulation
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cited_by cdi_FETCH-LOGICAL-c221t-332f3d7af51876bdb68337a76b1c2627520ec92e8d8a5b0ee14758c079a05d8d3
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container_end_page 2118
container_issue 9
container_start_page 2112
container_title IEEE transactions on plasma science
container_volume 40
creator Fleming, T. P.
Lambrecht, M. R.
Mardahl, P. J.
Keisling, J. D.
description Numerical simulations of a prototype conventional magnetron capable of an RF output power exceeding 1.3 MW at peak efficiency greater than 87% for relatively low diode voltages of ~ 40 kV are presented. Virtual prototyping of the magnetron design is carried out on massively parallel architecture utilizing the 3-D improved concurrent electromagnetic particle-in-cell code. Simulations demonstrate that the magnetron is capable of stable and robust oscillations in the π mode at saturation with negligible mode competition at 912 MHz over a range of magnetic fields extending from B = 0.18 T to B = 0.275 T and voltages ranging from 37-56 kV. RF Output power ranged from 400 kW-1.5 MW over these voltages with efficiencies typically above 85%. Oscillations in the π mode follow the Buneman-Hartree resonance curve for all magnetic fields sampled with a window of π-mode oscillations typically extending over 6 kV. Electron back bombardment of the cathode as well as collisions with the slow wave structure acted as major loss mechanisms.
doi_str_mv 10.1109/TPS.2012.2205274
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1939-9375
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source IEEE Electronic Library (IEL) Journals
subjects Anodes
Cathodes
Conventional magnetron
Electric currents
Electromagnetics
Electrons
high-power microwave
Magnetic fields
Magnetic resonance
Magnetic resonance imaging
Magnetomechanical effects
mode competition
Radio frequency
Saturation magnetization
Simulation
title A High-Efficiency Megawatt-Class Nonrelativistic Magnetron
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