This paper addresses the problem of aftercavity interaction in gyrotrons. The term “aftercavity interaction” is used for the cyclotron resonance interaction between electrons in a spent beam exiting the microwave cavity and traveling electromagnetic waves propagating from the cavity exit into the output part of a gyrotron. Aftercavity interaction may reduce the interaction efficiency by several percent and spoil the energy distribution of spent electrons, thus reducing the possibility of efficient utilization of depressed collectors. We have used a simple theory to find conditions resulting in the reduction of this effect. In particular, we have shown that both the axial waveguide wall profile and magnetic field distribution should be modified in order to weaken the effect of aftercavity interaction. We verified results of our simple analysis with advanced simulations and demonstrated that they are in good agreement. Result of these studies can be beneficial for the gyrotron efficiency enhancement.
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August 2010
Research Article|
August 16 2010
Possibilities for reducing the aftercavity interaction effect in gyrotrons
O. V. Sinitsyn;
O. V. Sinitsyn
Institute for Research in Electronics and Applied Physics,
University of Maryland
, College Park, Maryland 20742-3511, USA
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G. S. Nusinovich;
G. S. Nusinovich
Institute for Research in Electronics and Applied Physics,
University of Maryland
, College Park, Maryland 20742-3511, USA
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T. M. Antonsen, Jr.
T. M. Antonsen, Jr.
Institute for Research in Electronics and Applied Physics,
University of Maryland
, College Park, Maryland 20742-3511, USA
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Phys. Plasmas 17, 083106 (2010)
Article history
Received:
March 18 2010
Accepted:
July 06 2010
Citation
O. V. Sinitsyn, G. S. Nusinovich, T. M. Antonsen; Possibilities for reducing the aftercavity interaction effect in gyrotrons. Phys. Plasmas 1 August 2010; 17 (8): 083106. https://doi.org/10.1063/1.3469577
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