NDLI: Design and simulation of a megawatt class conventional magnetron

Content Provider	IEEE Xplore Digital Library
Author	Fleming, T. Lambrecht, M. Mardahl, P.
Copyright Year	2012
Description	Author affiliation: Air Force Research Laboratory Directed Energy Directorate, Kirtland AFB, NM, USA (Fleming, T.; Lambrecht, M.; Mardahl, P.)
Abstract	A Megawatt class conventional strapped magnetron (diode voltages < 100kV) design is simulated using the Improved Concurrent Electromagnetic Particle-in-Cell code (ICEPIC). ICEPIC is designed to run on massive parallel architecture, consequently field and particle resolution requirements for these simulations are satisfied. Simulations are carried out at over 22 million grid cells with a resolution of one grid length = 0.5 mm or less. Numerical results yield a design capable of a mean RF output power exceeding 1.5 MW at greater than 85% efficiency at ∼53 kV. The magnetron consistently oscillates in the π mode with no mode competition at ∼900 MHz across a range of magnetic fields and voltages extending from 0.18–0.3 T and 45–60 kV. RF output power extends from 500 kW to ∼ 4 MW over this range. Moreover RF output efficiency remains stable above 85% over these voltages and magnetic fields. Oscillations at these field parameters were consistent with single particle Buneman-Hartree analysis. For all cases, RF power is extracted axially through three conducting rod excitations. Field stresses remained below the Kilpatrick limit for simulations with diode voltage < 52 kV and exceeded the limit above 53 kV. Field stress maximums were observed between the straps and the anode as well as between the straps. Major power loss mechanisms were particle collisions with the slow wave structure and cathode, which accounted for a loss of over 10% of the input power.
Starting Page	489
Ending Page	489
File Size	158826
Page Count	1
File Format	PDF
ISBN	9781467301886
e-ISBN	9781467301893
e-ISBN	9781467301879
DOI	10.1109/IVEC.2012.6262243
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-04-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Radio frequency Magnetomechanical effects Atmospheric modeling Numerical models Power generation Magnetic fields Stress
Content Type	Text
Resource Type	Article

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