The self-consistent nonlinear theory of two-cavity high-harmonic gyroklystron amplifier has been developed. The efficiency and gain of a second-harmonic gyroklystron were calculated numerically. The results obtained were used to choose the optimal parameters of the experimental second-harmonic tube. The experimental study was carried out to test high-harmonic amplifier concept. Two-cavity 35 GHz second harmonic gyroklystron with the TE/sub 021/ cavity mode has been designed and tested in pulse operation. Output power of about 260 kW with efficiency 18% and 17 dB gain have been produced at 72 kV beam voltage and 20 A beam current. Bandwidth of about 0.1% has been observed. The restriction of the output power, efficiency, and gain was caused by spurious oscillations excited in the second cavity in the TE/sub 011/ mode at the fundamental cyclotron frequency.
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机译：提出了两腔高谐波回旋速调管放大器的自洽非线性理论。数值计算了二次谐波回旋速调管的效率和增益。获得的结果用于选择实验二次谐波管的最佳参数。进行了实验研究以测试高谐波放大器的概念。具有TE / sub 021 /腔模式的两腔35 GHz二次谐波回旋速调管已在脉冲操作中进行了设计和测试。在72 kV束电压和20 A束电流下，已经产生了约260 kW的输出功率，效率为18％，增益为17 dB。已经观察到约0.1％的带宽。输出功率，效率和增益的限制是由回旋加速器基本频率在TE / sub 011 /模式下在第二腔中激发的杂散振荡引起的。
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