A multitube configuration for a gyrotron traveling-wave amplifier (gyro-TWA) that is based on the use of one multibeam electron gun and several parallel helically corrugated interaction waveguides operating with axis-encircling-like electron beamlets at the second cyclotron harmonic is proposed. This new gyro-TWA concept, similar to that for multibeam or clustered linear-beam klystrons, can provide a multifold decrease in the thermal loading and increase in the RF breakdown strength for each tube at the same average or pulse output powers or a significant increase in the output power at a moderate level of the mentioned factors. It is shown that the multibeam electron flow appropriate for such a multitube gyro-TWA can be formed by a single magnetron-injection gun (MIG) using selectively emitting regions on the cathode. In some cases, such a gun can be less sensitive to the influence of space-charge forces and other disturbing factors and generate a beam of better quality than a single-beam cusp gun. In particular, a gun for the ten-tube W{W} -band gyro-TWA, which ensures generation of a beam with a total power of about 1.3 MW, a pitch factor from 1.2 to 1.5, and a root-mean-square (rms) transverse velocity spread of about 8%, was designed and numerically modeled.

中文翻译：

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多管螺旋波导回旋管行波放大器：器件概念和电子光学系统建模


提出了一种用于回旋管行波放大器 (gyro-TWA) 的多管配置，该配置基于使用一个多束电子枪和多个平行螺旋波纹相互作用波导，在回旋加速器二次谐波处与轴环绕式电子子束一起操作。这种新的陀螺仪-TWA 概念与多束或集束线性束速调管的概念类似，可以在相同的平均或脉冲输出功率或显着增加的情况下，使每个管的热负载减少数倍，并增加射频击穿强度。在上述因素的输出功率处于中等水平。结果表明，适合这种多管陀螺仪-TWA 的多束电子流可以通过使用阴极上的选择性发射区域的单个磁控管注入枪（MIG）形成。在某些情况下，这种枪对空间电荷力和其他干扰因素的影响不太敏感，并且产生比单束尖点枪质量更好的光束。特别是，用于十管W{W}波段陀螺仪TWA的枪，确保产生总功率约1.3MW、俯仰因数从1.2到1.5以及均方根的光束。 (rms) 横向速度分布约为 8%，经过设计和数值模拟。