18 November 1989 AC Space Charge Effects In Moderately Relativistic Gyrotrons
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Proceedings Volume 1039, 13th Intl Conf on Infrared and Millimeter Waves; (1989) https://doi.org/10.1117/12.978420
Event: 13th International Conference on Infrared and Millimeter Waves, 1987, Honolulu, HI, United States
Abstract
The effects of AC space charge fields are included in the analysis of moderately relativistic gyrotrons. We adopt the slow time scale formalism developed by Antonsen, Manheimer and Levush [1] to describe the transverse self-fields while the electromagnetic fields are given by the cold cavity modes. Using a partially self consistent numerical code [2], simulations of multi-cavity gyroklystron amplifiers were performed. Preliminary studies indicate that there is an increase in both gain and efficiency. We believe that this increase in efficiency can be attributed to the relative weakness of the AC space charge field compared to the electromagnetic field: in high voltage, high current devices the interaction length is short so that the cavities do not self-oscillate. Because of the short interaction length the electromagnetic field must be large, making the AC space charge field small in comparison.
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P. E. Latham, T. M. Antonsen, "AC Space Charge Effects In Moderately Relativistic Gyrotrons", Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); doi: 10.1117/12.978420; https://doi.org/10.1117/12.978420
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