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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Modelling the effects of an electron beam on the potential distribution in a low pressure parallel electrode discharge
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Modelling the effects of an electron beam on the potential distribution in a low pressure parallel electrode discharge

机译:模拟低压平行电极放电中电子束对电势分布的影响

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The effect of an electron beam on the potential distribution in a one-dimensional model of a steady parallel electrode discharge is investigated theoretically. Taking the electrodes to be well separated, it is shown that the potential across the sheath of the emitting electrode is decreased by the electron beam. At the absorbing electrode the potential across the sheath is increased. For the latter electrode the potential must be less than a certain maximum value if the beam electrons are to traverse the discharge. Coupling the electrodes by an external current I-ext, a characteristic is derived relating I-ext and the applied voltage V-a. Assuming the beam current at the absorber is some fraction alpha of the beam current at the emitter, then the maximum slope of the characteristic can be used to determine the electron temperature, or alpha. Finally, the properties of the special case of coupled electrodes with I-ext = 0, one electrode being earthed, is discussed. [References: 7]
机译:理论上研究了电子束对稳定平行电极放电的一维模型中电势分布的影响。采取使电极充分分离的方式,可以看出电子束降低了跨发射电极鞘的电势。在吸收电极处,穿过护套的电势增加。对于后一个电极,如果束电子要穿过放电,则电势必须小于某个最大值。通过外部电流I-ext耦合电极,得出与I-ext和施加电压V-a相关的特性。假设吸收器处的电子束电流是发射器处电子束电流的几分之一α,则该特性的最大斜率可用于确定电子温度或α。最后,讨论了I-ext = 0且电极接地的耦合电极的特殊情况的特性。 [参考:7]

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