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Competition of modes resonant with arbitrary cyclotron harmonics in a gyrotron with nonfixed axial structure of the high-frequency field

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3 Author(s)
O. Dumbrajs ; Arbeitsbereich Hochfrequenztech., Tech. Univ. Hamburg-Harburg, West Germany ; G. S. Nusinovich ; A. B. Pavelyev

A general theory is developed for self-consistent calculations of mode competition in a gyrotron with nonfixed axial structure of the RF field for arbitrary cyclotron harmonics. The theory is applied to the gyrotron operating at the Kernforschungszentrum Karlsruhe with a frequency of 150 GHz. The formalism presented allows a self-consistent calculation of mode competition for the operating and parasitic modes at the cyclotron resonance at arbitrary harmonics. Specific calculations are carried out for the cases n0=1, n1 =2 and n0=2, n1=1. It is emphasized that the formalism considered applies only to the case in which the azimuthal orthogonality condition is satisfied: n0m1n1 m0. There are circumstances when this condition is not satisfied

Published in:

IEEE Transactions on Plasma Science  (Volume:18 ,  Issue: 3 )