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Experimental start-up results of 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. The start-up paths through the plane are determined by the time evolution of the beam parameters during the start-up phase and are seen to determine the cavity oscillating mode. Experimental results show that competition between the TE(22.6) and TE(-19.7) modes can be completely eliminated by using the proper start-up method in a case where a typical triode start-up results in oscillation in the competing TE(-19.7) mode. These new results, applicable to any arbitrary gyrotron cavity mode, are shown to be in excellent agreement with theory.

Additional information

Authors: WHALEY D R ET AL., 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 (US);TRAN C, Thomson Tubes Electroniques, Vélizy-Villacoublay (FR)
Bibliographic Reference: Article: Physical Review Letters, Vol. 75 (1995) No. 7, pp. 1304-1307
Record Number: 199511514 / Last updated on: 1995-11-03
Original language: en
Available languages: en