电子束与非均匀等离子体相互作用产生高能超热电子
Generation of anomalously energetic suprathermal electrons by an electron beam interacting with a nonuniform plasma
摘要：
在阴极电子发射的高压直流放电模拟中观察到了高能超热电子的产生。由发射产生的电子束通过双流不稳定性与放电中的非均匀等离子体相互作用。等离子体的不均匀性保证了从射束到等离子体电子的有效能量传递。电子束激发等离子体波，其波长和相速度向阳极逐渐减小。阳极附近的短波将等离子体体电子加速到超热能量。阳极附近的鞘层将一些加速的电子反射回等离子体。这些电子穿过等离子体，在阴极附近反射，再次进入加速区，但能量比以前更高。这样的粒子被加速到比第一次加速后高得多的能量。这种机制在解释早期实验观察到的高能超热电子在类似的放电中发挥了作用。
英文摘要：
Generation of anomalously energetic suprathermal electrons was observed in simulation of a high- voltage dc discharge with electron emission from the cathode. An electron beam produced by the emission interacts with the nonuniform plasma in the discharge via a two-stream instability. Efficient energy transfer from the beam to the plasma electrons is ensured by the plasma nonuniformity. The electron beam excites plasma waves whose wavelength and phase speed gradually decrease towards anode. The short waves near the anode accelerate plasma bulk electrons to suprathermal energies. The sheath near the anode reflects some of the accelerated electrons back into the plasma. These electrons travel through the plasma, reflect near the cathode, and enter the accelerating area again but with a higher energy than before. Such particles are accelerated to energies much higher than after the first acceleration. This mechanism plays a role in explaining earlier experimental observations of energetic suprathermal electrons in similar discharges.
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