35-GHz 25-kW CW low-voltage third-harmonic gyrotron

A 50-kV third-harmonic gyrotron is shown to be capable of high efficiency. Operation at the third harmonic allows the required magnetic field for 35 GHz generation to be supplied by a 4.5-kG permanent magnet. Two gyrotrons employing sliced circuits for mode control have been evaluated with a large-s...

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Bibliographic Details
Published inIEEE transactions on plasma science Vol. 24; no. 3; pp. 613 - 619
Main Authors McDermott, D.B., Balkcum, A.J., Luhmann, N.C.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.06.1996
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Circuits
Cyclotrons
Electron beams
Frequency
Gyrotrons
Magnetic fields
Permanent magnets
Senior members
Superconducting magnets
Voltage
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Summary:A 50-kV third-harmonic gyrotron is shown to be capable of high efficiency. Operation at the third harmonic allows the required magnetic field for 35 GHz generation to be supplied by a 4.5-kG permanent magnet. Two gyrotrons employing sliced circuits for mode control have been evaluated with a large-signal nonself-consistent particle-tracing simulation code and found to be capable of producing 25 kW continuously. The preliminary design of a third-harmonic TE/sub 41/ gyrotron utilizing a magnetron injection electron gun is predicted to yield a device efficiency of 17%, which can potentially be increased to 46% with an ideal single-stage depressed collector, while an axis-encircling electron beam from a Cusp electron gun is predicted to drive a third-harmonic TE/sub 31/ gyrotron with a device efficiency of 23%, which can theoretically be increased to 45% through the use of an ideal depressed collector.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:0093-3813
1939-9375
DOI:10.1109/27.532944