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Estimation of Beam and Plasma Parameters for Electron Beam Transport in Ion-Focused Regime

机译:离子聚焦条件下电子束传输的束和等离子体参数的估计

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摘要

This paper presents the analysis of cylindrical electron beam and beam-impact-generated plasma using particle-in-cell simulation code VSim 6.2 at different operating conditions. The transient plasma parameters, such as, beam density, charge neutralization factor, space charge potential, ionization time, beam compression, and plasma electron temperature, have been estimated and analyzed for a 40-keV, 10-100-A electron beam propagating in argon gas-filled drift space at different operating pressures. These parameters are difficult to be measured experimentally. The evaluated charge-neutralizing factor has been found dynamic in space and time, which is maximum at the beam envelope. The voltage profile of space charge potential required for effective electron beam propagation approaches zero due to formation of the plasma in the order of ionization time. The estimated average plasma electron temperature has been found to be less than ~1 eV, which is less damaging for interaction structure of the plasma-assisted microwave sources. It has been observed that an optimum pressure limit needs to be maintained inside the drift space to prevent the loss of electron beam due to instabilities resulting in excessive collisions with the drift space walls.
机译:本文介绍了在不同工作条件下使用单元格内模拟代码VSim 6.2分析圆柱电子束和电子束产生的等离子体。对于40keV,10-100A电子束在电子束中传播,已估算并分析了瞬态等离子体参数,例如束密度,电荷中和因子,空间电荷电势,电离时间,束压缩和等离子体电子温度。在不同工作压力下充满氩气的漂移空间。这些参数很难通过实验测量。已发现评估的电荷中和因子在空间和时间上是动态的,这在光束包络处最大。由于等离子体以电离时间的顺序形成,有效电子束传播所需的空间电荷电势的电压曲线接近零。已发现估计的平均等离子体电子温度低于〜1 eV,这对等离子体辅助微波源的相互作用结构的破坏较小。已经观察到,需要在漂移空间内维持最佳压力极限,以防止由于不稳定性导致的电子束损失,从而导致与漂移空间壁的过度碰撞。

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