H. J. Kim, E. A. Nanni
An experimental study of picosecond pulse amplification in a gyrotron-traveling wave tube (gyro-TWT) has been conducted to investigate its operational capabilities near 140 GHz. The objective was to achieve significant small signal gain, identified at 30 dB in the HE06 mode of a confocal waveguide. Methodologically, the research focused on characterizing the pulse propagation, addressing the observed broadening and transit time delay of picosecond pulses due to the frequency dependence of the group velocity near cutoff, as well as gain narrowing from a finite gain bandwidth of 1.2 GHz. Results demonstrated that the theoretical model used effectively aligns with the experimental data over a range of operational parameters, marking an essential finding that to limit pulse broadening in gyrotron amplifiers, it is crucial to select an operating frequency several percent above the waveguide circuit cutoff and to work within the gain spectrum's central bandwidth. This research highlights the challenges and requirements for optimal performance in gyrotron pulse amplification.
@article{1525aa12-be17-40a0-afd6-e7f5475fb606,
title={Amplification of Picosecond Pulses in a},
author={H. J. Kim and E. A. Nanni},
year={2026},
language={en}
}TY - JOUR TI - Amplification of Picosecond Pulses in a AU - H. J. Kim AU - E. A. Nanni PY - 2026 LA - en ER -
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