Wide-bandwidth high-power Cerenkov amplifiers: why dielectric slow-wave structures?

Anatoli S. Shlapakovski

doi:10.1117/12.255400

28 October 1996 Wide-bandwidth high-power Cerenkov amplifiers: why dielectric slow-wave structures?

Anatoli S. Shlapakovski

Proceedings Volume 2843, Intense Microwave Pulses IV; (1996) https://doi.org/10.1117/12.255400
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

Dielectric and conducting periodic slow-wave structures are compared for achievable values of relativistic amplifier bandwidths. It was shown earlier that a dielectric Cherenkov maser is capable of very large -3 dB bandwidths; on the other hand, in the case of conducting structures, there are no disadvantages caused by dielectric presence. Despite of stopband existence, a periodic waveguide may have rather wide passband and weak dispersion at relativistic phase velocities if its parameters are properly chosen. For comparison, a simplified model is employed neglecting the space harmonics of a periodic waveguide. The -3 dB bandwidth values have been determined from the numerical solution of the dispersion relation. It turns out that periodic structures, even at weaker dispersion, can not compete with dielectric-lined waveguides for wide-bandwidth amplifier operation. The reasons and consequences of that are discussed.

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Anatoli S. Shlapakovski "Wide-bandwidth high-power Cerenkov amplifiers: why dielectric slow-wave structures?", Proc. SPIE 2843, Intense Microwave Pulses IV, (28 October 1996); https://doi.org/10.1117/12.255400

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