Allen K. Kinkead

TL;DR: A new regime of single-surface multipactor was observed during high-power testing of an 11.424-GHz alumina-based dielectric-loaded accelerating structure, in which strong normal and tangential rf electric fields are present and the power flow is parallel to the surface, and more than half of the incident power can be absorbed.

TL;DR: In this article, the collective free-electron laser interaction was studied at millimeter wavelengths using a newly designed experimental apparatus which features an electron beam of low emittance, and measurements in a superradiant amplifier configuration indicated the production of 35 MW at ∼4 mm with an efficiency of 2.5%.

TL;DR: In this paper, a new intense-beam free-electron laser experiment, operating as a short-pulse amplifier at 35 GHz, has demonstrated linear growth rates of 12 dB/cm, total gain of 50 dB, and coherent emission of 17 MW.

TL;DR: In this article, a K/sub a/-band gyrotron oscillator powered by a compact pulseline accelerator has been operated using oscillator cavities with and without axial slots.

TL;DR: In this article, an intense-beam gyro-traveling-wave amplifier was used to demonstrate an apparent growth rate of 2.2 dB/cm at 35 GHz, with total gain exceeding 30 dB, and an output power of ∼20 MW (± 3 dB), corresponding to an efficiency of ∼11%.