NDLI: Mode excitation during the voltage rise in megawatt gyrotrons

Content Provider	IEEE Xplore Digital Library
Author	Tax, D.S. Guss, W.C. Shapiro, M.A. Temkin, R.J.
Copyright Year	2012
Description	Author affiliation: Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, MA 02139 USA (Tax, D.S.; Guss, W.C.; Shapiro, M.A.; Temkin, R.J.)
Abstract	To achieve high power and efficiency, megawatt gyrotrons must utilize large, overmoded cavities that face severe mode competition. Under these conditions, small changes in operational parameters can alter the sequence in which modes are excited during the voltage rise, affecting the final operating state of the gyrotron. We present experimental results from our 1.5 MW, 110 GHz gyrotron operating in the TE mode at 96 kV and 42 A. While codes such as MAGY predict that higher frequency modes, such as the TE mode at 113 GHz, should be generated during the voltage rise, we instead measured lower frequencies, near 108 GHz. The measured frequencies indicate that these modes, if excited in the cavity, must be backward waves in the TE mode with higher-order axial field structures.
Starting Page	113
Ending Page	114
File Size	257682
Page Count	2
File Format	PDF
ISBN	9781467301886
e-ISBN	9781467301893
e-ISBN	9781467301879
DOI	10.1109/IVEC.2012.6262095
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	Gyrotrons Voltage measurement Cavity resonators Transmission line measurements Time frequency analysis Tuning start-up megawatt gyrotron millimeter wave electron cyclotron heating mode competition
Content Type	Text
Resource Type	Article

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