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A Numerical Investigation on the Behavior of Electrons in the Bullet in the Atmospheric-Pressure Argon Plasma Jet
IEEE Transactions on Plasma Science ( IF 1.5 ) Pub Date : 2020-09-01 , DOI: 10.1109/tps.2020.3012973
Changqing Lu , Zhenyu Tan , Xinxian Chen , Wei Lin , Xiaolong Wang

Electrons are generated abundantly in the plasma jet and play an active role in the mass transfer of reactive species in the aqueous solution in plasma medicine. Such an importance requires knowledge of the behavior of electrons in the plasma jet. The objective of this work is to understand the electron behaviors in the bullet in the plasma jet, including the angle spectrum of electrons (ASEs) and the related energy spectrum, so as to have an insight into those electrons which most probably interact with the target. The numerical modeling based on a needle–plate discharge configuration in conjunction with a 1-D Particle-in-Cell Monte-Carlo Collision (PIC-MCC) simulation method was used to achieve this task. The scattering angle of electron in the bullet is described using the angle between the electron scattering direction and the bullet propagation direction. The ASE in the bullet is close to a sinusoidal distribution. As the bullet propagates, the temporal evolution of ASE indicates that relatively more electrons in the bullet are scattered into the angle range below 90°, but at any moment when the propagating bullet is close to the target, ASE in the bullet generally remains unchanged. In addition, relatively less electrons in the bullet are scattered into the angle range below 90° due to the increase of the applied voltage amplitude. For the considered voltage amplitudes below 7 kV, the number of electrons in the angle range below 90° is within 47% of electrons in the bullet and, in these electrons, the proportion of non-subionization electrons reaches about 12%. These results may be taken into consideration in investigating the mass transfer of reactive species in plasma medicine.

中文翻译:

大气压氩等离子射流子弹中电子行为的数值研究

电子在等离子体射流中大量产生,并在等离子体医学中水溶液中活性物质的传质中发挥积极作用。这种重要性需要了解等离子体射流中电子的行为。这项工作的目的是了解等离子射流中子弹中的电子行为,包括电子角谱(ASEs)和相关能谱,从而深入了解那些最有可能与目标相互作用的电子. 基于针板放电配置的数值建模结合一维细胞内粒子蒙特卡罗碰撞 (PIC-MCC) 模拟方法用于完成此任务。电子在子弹中的散射角用电子散射方向与子弹传播方向的夹角来描述。子弹中的 ASE 接近于正弦分布。随着子弹的传播,ASE的时间演化表明子弹中相对较多的电子被散射到90°以下的角度范围内,但在传播子弹接近目标的任何时刻,子弹中的ASE基本保持不变。此外,由于外加电压幅度的增加,子弹中相对较少的电子被散射到90°以下的角度范围内。对于所考虑的低于 7 kV 的电压幅度,低于 90° 的角度范围内的电子数量在子弹中电子的 47% 以内,并且在这些电子中,非亚电离电子的比例达到12%左右。在研究血浆药物中活性物质的传质时可以考虑这些结果。
更新日期:2020-09-01
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