Modeling of gyroklystrons with MAGY

Khanh T. Nguyen, Baruch Levush, Thomas M. Antonsen, Moti Botton, Monica Blank, J. P. Calame, Bruce G. Danly

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


The self-consistent time-dependent code MAGY is presently being used for designing and modeling gyrodevices. In this paper, the code's self-consistent capability is used to investigate three different issues relating to the operation of gyroklystrom amplifiers. These are the effect of window reflection on the properties of the output waves, higher order mode excitation in nonlinear output tapers, and excitation in cutoff drift sections. The first two effects can potentially have major impacts on the gyroklystrom output radio frequency (RF) in terms of bandwidth power ripple, phase ripple across the band, and mode purity. In fact, strong correlation between simulation results and experimental data indicates that the observed bandwidth ripple in a recently tested W-band gyroklystrom can be attributed to a small (-20-dB) window reflection. The last effect, excitation in cutoff drift sections, is found to result in a high level of RF fields at the drive frequency in drift sections. This effect impacts the design and use of lossy ceramics in the drift section because of thermal considerations, particularly in high average power devices.

Original languageAmerican English
Pages (from-to)867-886
Number of pages20
JournalIEEE Transactions on Plasma Science
Issue number3
StatePublished - Jun 2000
Externally publishedYes

Bibliographical note

Funding Information:
Manuscript received October 15 1999; revised March 3, 2000. This work is supported by the Office of Naval Research and by the Department of Defense HPC Center NAVO, under a grant of HPC time. K. T. Nguyen is with the Vacuum Electronics Branch, Naval Research Laboratory, Washington, DC 20375 USA and with KN Research, Silver Spring, MD 20905 USA (e-mail: B. Levush, J. P. Calame, and B. Danly are with the Vacuum Electronics Branch, Naval Research Laboratory, Washington, DC 20375 USA. T. M. Antonsen, Jr., and M. Botton are with the University of Maryland, College Park, MD 20742 USA. M. Blank is with the Communication and Power Industries, Palo Alto, CA 94303 USA. Publisher Item Identifier S 0093-3813(00)05714-3.


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