Three-dimensional particle-in-cell simulation of discharge characteristics in cylindrical anode layer hall plasma accelerator
Three-dimensional particle-in-cell simulation of discharge characteristics in cylindrical anode layer hall plasma accelerator
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DOI：
10.1063/1.3703321
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发表时间：
2012-04
影响因子：
2.2
通讯作者：
S. Geng;X. Qiu;Chin-min Cheng;P. Chu;D. Tang
中科院分区：
文献类型：
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作者：
S. Geng;X. Qiu;Chin-min Cheng;P. Chu;D. Tang
在圆柱形阳极层霍尔等离子体加速器中，当放电电压增加时，会出现电流下降现象，并利用三维粒子模拟研究了这一现象。模拟结果与实验结果一致，表明放电区域的离子密度并不总是随着放电电压的增加而增加，在适当的电压下，离子密度达到最大值。这一现象被认为是电子能量变化时电离截面变化的宏观分支。对于Ar+离子，当电子能量为45-110 eV时，电离截面最大。在霍尔等离子体加速器中，电子漂移速度由E/B决定，并控制电子能量。最后用E/B确定了产生Ar+的截面。分析表明，对于氩离子，电离区的E/B值为2.81 × 10 ~ 6 ~ 4.40 × 106 m/s。
A current drop is found when the discharge voltage is increased in the cylindrical anode layer hall plasma accelerator and three-dimensional particle-in-cell simulation is performed to investigate the phenomenon. The simulation results which agree with experiments show that the ion density in the discharge region does not always rise when the discharge voltage is increased and the ion density reaches a maximum value at the appropriate voltage. This phenomenon is considered to be the macroscopic ramification of the change in the ionization cross section as the electron energy varies. With regard to Ar+, the largest ionization cross section appears when the electron energy is 45–110 eV. In the hall plasma accelerator, the electron drift speed is governed by E/B and controls the electron energy. Finally, the cross section of producing Ar+ is determined by E/B. Our analysis reveals that the proper E/B value in the ionization region is 2.81 × 106 m/s to 4.40 × 106 m/s for argon.