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Experimental results of startup studies on a 118 GHz TE(22.6) gyrotron are presented and compared with theory. The startup paths through the energy-velocity-pitch-angle plane are determined by 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) mode can be completely eliminated by use of 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: ANTONSEN T M, University of Maryland, Institute for Plasma Research and Departments of Electrical Engineering and Physics (US);DUBROVIN A, Thomson Tubes Electroniques, Vélizy-Villacoublay (FR);TRAN C, Thomson Tubes Electroniques, Vélizy-Villacoublay (FR);WHALEY D R ET AL., Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Proceedings of the 20th International Conference on Infrared and Millimeter Waves (1995) pp. 7-8
Record Number: 199511521 / Last updated on: 1995-12-12
Original language: en
Available languages: en