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首页> 外文期刊>Physics of plasmas >Self-oscillations in an over-injected electron diode - Experiment and analysis
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Self-oscillations in an over-injected electron diode - Experiment and analysis

机译：过度注入的电子二极管中的自振荡 - 实验和分析

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摘要

An experimental setup to demonstrate a recent scheme [Leopold et al., Phys. Plasmas 24, 073116 (2017)] to persistently over-inject a vacuum electron diode so that it self-oscillates in the GHz-frequency range and releases a periodic train of electron hunches is described. We present simulations in which we account for the finite rise time of the voltage accelerating electrons from a finite radius cylindrical thermionic cathode and finite grid electrode transparency, which make the experiment different from the original theoretical scheme. It was found that these experimental conditions do affect the expected results but a self-oscillating behavior is still possible. Our experimental results so far indicate the presence of the self-oscillatory behavior, but because the cathode used emits from a few hot-spots rather than uniformly, the beam current modulations are different from those obtained in the simulations.
机译：实验设置展示最近的方案[Leopold等人。，phy。 等离子体24,073116（2017）]持续注入真空电子二极管，使得其在GHz频率范围内自振荡并释放捕获电子猎犬的周期性列车。 我们存在仿真，其中我们考虑了从有限的半径圆柱形热阴极和有限栅极透明度的电压加速电子的有限上升时间，这使得实验与原始理论方案不同。 结果发现，这些实验条件确实影响了预期的结果，但仍然是自振荡行为。 我们的实验结果到目前为止表明存在自振荡行为，而是因为所用的阴极从几个热点而不是均匀地发射，所以光束电流调制与模拟中获得的阴束电流调制不同。

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