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High-harmonic gyrotrons are challenging to generate high interaction efficiency and simultaneously suppress the mode competition. Investigation in this paper reveals that a high-$Q$ cavity is potential to realize high efficiency in a 94-GHz third-harmonic TE02 mode gyrotron. Unfortunately, the high-$Q$ cavity exhibits severe mode competition from the lower harmonic modes. A start-up scenario of...
In this paper, the design and experiment of the conventional electron beam spreading system for W-band gyrotron oscillator collector is presented. The conventional spread system consists of a magnetic shade and two pairs of coils. The particle-in-cell (PIC) simulation of the collector under the conventional spreading system has been finished. The power density distribution of the electron beam on...
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