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1 October 1991 Effect of window reflections on gyrotron operation
T. M. Antonsen Jr.
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Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15760T (1991) https://doi.org/10.1117/12.2297742
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland
Abstract
The output power from a gyrotron is usually extracted through a window which is not perfectly transmitting. Thus, a fraction of the power is reflected back into the interaction region. This reflection can affect the operation of a gyrotron in several ways1. First, the reflection modifies the Q factor of the cavity and changes the operating characteristics such as start current and efficiency. Second, due to the so-called long line effect the spectrum of stationary modes in the cavity becomes dense with a spacing equal to the reciprocal of the round trip travel time from the cavity to the window and back. A third consequence is the effect of the variation of reflection coefficient with frequency on mode competition. We will examine these effects with the aid of simple models and time dependent multimode numerical simulation. One result of our studies is that even for small reflection coefficients if the delay time is sufficiently long the time dependence of the radiation field in a single transverse mode can become quite complicated.
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T. M. Antonsen Jr. "Effect of window reflections on gyrotron operation", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15760T (1 October 1991); https://doi.org/10.1117/12.2297742
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KEYWORDS
Adaptive optics
Analytical research
Numerical simulations
Plasma
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