On the feasibility of a pulsed gyrotron with a peak rf power exceeding the power of the operating electron beam

Glyavin, M. Yu.; Osharin, I. V.; Savilov, A. V.

doi:10.1063/1.4989776

Cited by 8 publications

(1 citation statement)

References 27 publications

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“…First, the excitation of HOAMs is naturally unstable owing to the competition from the first axial mode. [28] Second, owing to the weak coupling between the HOAMs and electrons, the total electron efficiency is generally small. Investigation in this paper reveals that a short lossy section loaded in the cavity will effectively stabilize the oscillation of HOAMs, and the magnetic field profile with a down-tapered tail can provide an efficient forward-wave enhancement owing to traveling-wave amplification.…”

Section: Introductionmentioning

confidence: 99%

Forward-wave enhanced radiation in the terahertz electron cyclotron maser

Gao

Du²,

Li³

et al. 2022

Chinese Phys. B

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Based on the principle of electron cyclotron maser (ECM), gyrotrons are among the most promising devices to generate powerful coherent terahertz (THz) radiation and play a vital role in numerous advanced THz applications. Unfortunately, THz ECM systems using a conventional high-Q cavity were theoretically and experimentally demonstrated to suffer from strong ohmic losses, and, accordingly, the wave output efficiency was significantly reduced. A scheme to alleviate such a challenging problem is systematically investigated in this paper. The traveling-wave operation concept is employed in a 1-THz third harmonic gyrotron oscillator, which strengthens electron-wave interaction efficiency and reduces the ohmic dissipation, simultaneously. A lossy belt is added in the interaction circuit to stably constitute the traveling-wave interaction, and a down-tapered magnetic field is employed to further amplify the forward-wave (FW) component. The results demonstrate that the proportion of ohmic losses is nearly halved, and output efficiency is nearly doubled, which is promising for further advancement of high-power continuous-wave operation of the ECM-based devices.

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Section: Introductionmentioning

confidence: 99%