NDLI: Excitation of backward waves in the beam tunnel of a high power gyrotron

Content Provider	IEEE Xplore Digital Library
Author	Yu, J. Antonsen, T.M. Nusinovich, G.S.
Copyright Year	2008
Description	Author affiliation: Inst. for Res. in Electron. & Appl. Phys., Univ. of Maryland, College Park, MD (Yu, J.; Antonsen, T.M.; Nusinovich, G.S.)
Abstract	Gyrotrons are an important source of high power coherent radiation in 100 GHz - 200 GHz range. As applications call for higher power, the power in the beam will increase as the danger of spurious oscillations. Competition between operating modes and competing spurious modes in the interaction cavity is a well studied phenomena, with established methods for suppressing the unwanted modes. Spurious modes can also be excited in the beam tunnel, generally in the form of gyro-backward waves. We have made a numerical analysis of the conditions for excitation of backward waves in the beam tunnel of a 170 GHz gyrotron. The analysis includes tapering of the wall, variation of the magnetic field in the beam tunnel, and the presence of losses. Our results will be presented in the form of a requirement on the amount of wall loss needed to suppress backward waves for a given beam current.
Starting Page	1
Ending Page	2
File Size	503372
Page Count	2
File Format	PDF
ISBN	9781424421190
DOI	10.1109/ICIMW.2008.4665541
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-09-15
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gyrotrons Surface impedance Magnetic fields Impedance Surface waves Electron beams Mathematical model
Content Type	Text
Resource Type	Article

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