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Abstract

Experimental results of startup studies on a 118 GHz TE(22,6) gyrotron are presented and compared with theory. The theoretical excitation regimes of competing modes are computed in the energy-velocity-pitch-angle plane near the operation point. The startup paths through the plane are determined by the time evolution of the beam parameters during the startup phase. These startup paths are modified by changing the anode and cathode voltage rise from zero to their nominal values and are seen to determine the cavity oscillating mode. Experimental results show specifically that competition between the TE(22,6) and TE(-19,7) modes can be completely eliminated by using the proper startup method in a case where a typical triode startup results in oscillation in the competing TE(-19,7) mode. These new results are shown to be in excellent agreement with theory whose approach is general and therefore applicable to gyrotrons operating in any arbitrary cavity mode.

Additional information

Authors: WHALEY D R, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);TRAN M Q, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);ALBERTI S, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);TRAN T M, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH);ANTONSEN T M, University of Maryland, Institute for Plasma Research and Departments of Electrical Engineering and Physics, College Park (US);TRAN C, Thomson Tubes Electroniques, Vélizy-Villacoublay (FR)
Bibliographic Reference: Report: LRP 514/95 EN (1995) 13 pp.
Availability: Available from Confédération Suisse, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, 21 avenue des Bains, 1007 Lausanne (CH)
Record Number: 199510594 / Last updated on: 1995-05-03
Category: PUBLICATION
Original language: en
Available languages: en