当前位置: X-MOL 学术Plasma Sources Sci. Technol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Scaling of pulsed nanosecond capillary plasmas at different specific energy deposition
Plasma Sources Science and Technology ( IF 3.8 ) Pub Date : 2020-12-11 , DOI: 10.1088/1361-6595/abc413
Yifei Zhu 1, 2 , Svetlana M Starikovskaia 1 , Natalia Yu Babaeva 3 , Mark J Kushner 4
Affiliation  

Nano-second, capillary discharges (nCDs) are unique plasma sources in their ability to sustain high specific energy deposition ω dep approaching 10 eV/molecule in molecular gases. This high energy loading on short timescales produces both high plasma densities and high densities of molecular exited states. These high densities of electrons and excited states interact with each other during the early afterglow through electron collision quenching and associative ionization. In this paper we discuss results from a two-dimensional computational investigation of a nCD sustained in air at a pressure of 28.5mbar and with a voltage amplitude 20 kV. Discharges were investigated for two circuit configurations—a floating low voltage electrode and with the low voltage electrode connected to ground through a ballast resistor. The first configuration produced a single ionization wave from the high to low voltage electrode. The second produced converging ionization waves beginning at both electrodes. With a decrease of the tube radius, the velocity of the ionization fronts decreased while the shape of the ionization wave changed from the electron density being distributed smoothly in the radial direction, to being hollow shaped where there is a higher electron density near the tube wall. For sufficiently small tubes, the near-wall maxima merge to have the higher density on the axis of the capillary tube. In the early afterglow, the temporal and radial behavior of the N2(C3Πu) density is a sensitive function of ω dep due to electron collision quenching. These trends indicate that starting from ω dep ⩾ 0.3 eV/molecule, it is necessary to take into account interactions of electrons with electronically excited species during the discharge and early afterglow.



中文翻译:

不同比能沉积下脉冲纳秒毛细管等离子体的缩放

纳米第二,毛细管放电(非传染性疾病)是独特的等离子体源在它们维持高的比能量沉积能力ω DEP分子气体中的分子接近10 eV /分子。这种在短时间尺度上的高能量负载会产生高等离子体密度和高分子退出态密度。这些高密度的电子和激发态在余辉早期通过电子碰撞猝灭和缔合电离相互相互作用。在本文中,我们讨论了在28.5mbar的压力和20 kV的电压幅值下在空气中维持的nCD的二维计算研究结果。研究了两种电路配置的放电-浮动低压电极和低压电极通过镇流电阻器接地的情况。第一种配置从高压电极到低压电极产生单个电离波。第二个产生的会聚电离波始于两个电极。随着管半径的减小,电离前沿的速度降低,而电离波的形状从电子密度沿径向平滑分布变为空心形状,在管壁附近电子密度更高。 。对于足够小的管,近壁最大值合并以在毛细管的轴上具有更高的密度。在余辉的早期,N的时间和径向行为 对于足够小的管,近壁最大值合并以在毛细管的轴上具有更高的密度。在余辉的早期,N的时间和径向行为 对于足够小的管,近壁最大值合并以在毛细管的轴上具有更高的密度。在余辉的早期,N的时间和径向行为2(C 3 Π Ú)密度是的敏感函数ω DEP由于电子碰撞猝灭。这些趋势表明,从开始ω DEP ⩾为0.3eV /分子,有必要考虑与电子激发物种的电子的相互作用的帐户在放电和早期余辉。

更新日期:2020-12-11
down
wechat
bug