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首页> 外文会议>The 41st IEEE International Conference on Plasma Science, and the 20th International Conference on High-Power Particle Beams >Features of wave processes in pre-modulated electron beam and its interaction with electromagnetic field
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Features of wave processes in pre-modulated electron beam and its interaction with electromagnetic field

机译：预调制电子束中波过程的特征及其与电磁场的相互作用

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Summary form only given. Wave processes in pre-modulated electron stream interacted with electromagnetic field has been considered in the framework of 2-dim linear theory. Influences of space charge (thin beam model [1]) and finite focusing magnetic field have been taken into account. For describing the interaction the system included excitation equation of rf electric field and equations of rf electron displacements has been used. Analysis [2] predicted the excitation of space charge waves and cyclotron waves and the resonance occurrence at synchronism of one of them with wave in transmission line. In some cases space charge leads to instability appearance. Two types of instability in strip and tubular electron streams have been defined: spatial static and rf instability. Special attention is given to the rf instability, occurring in the interaction with e/m fields. Its condition has been derived taking into account the effects of both the space charge and magnetic fields, and it is pointed at possibility of some improvement of interaction efficiency. Electron flow pre-modulation is possible especially due to using of photo-cathodes and cold cathodes that could be applied in THz devices because of their peculiarities. By setting initial conditions in different ways the effect of magnetic field on interaction has been investigated in photo-TWT, carcinotrode (BWO with emission automodulation [3]), BWO in pre-generation regime, also its influence on behavior of noise factor in TWT has been considered. Successive approximation and dispersion equation methods have been applied for solving. The resonances allow to investigate two-waves approaching, in which start-up conditions of carcinotrode (synchronic regime, earlier unexplored cyclotron resonance regime) have been derived. The conformity of results in general case and in two-waves approaching is shown.
机译：仅提供摘要表格。在2-dim线性理论的框架内考虑了预调制电子流中与电磁场相互作用的波过程。已经考虑了空间电荷（薄光束模型[1]）和有限聚焦磁场的影响。为了描述相互作用，使用了包括射频电场的激发方程和射频电子位移方程的系统。分析[2]预测了空间电荷波和回旋波的激发以及其中之一与传输线中的波同步发生共振。在某些情况下，空间电荷会导致不稳定。条形和管状电子流中的两种不稳定性已定义为：空间静态不稳定性和rf不稳定性。特别注意与e / m场相互作用时发生的rf不稳定性。考虑到空间电荷和磁场的影响，得出了它的条件，指出了相互作用效率有一定提高的可能性。电子流的预调制是可能的，特别是由于使用了光电阴极和冷阴极，由于它们的特殊性，它们可以应用于THz器件。通过以不同方式设置初始条件，研究了光TWT，共鸣电极（具有发射自动调节功能的BWO [3]），前代状态下的BWO对磁场的相互作用的影响，以及其对TWT中噪声因子行为的影响已经考虑过了。逐次逼近和弥散方程方法已用于求解。共振允许研究接近两波的情况，其中推导了共鸣电极的启动条件（同步状态，早期未探索的回旋共振状态）。显示了在一般情况下和两波逼近中结果的一致性。

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