2D Kinetic Simulation of Current-Carrying Plasma Expansion

被引:7
|
作者
Shmelev, Dmitry L. [1 ,2 ]
Uimanov, Igor, V [1 ]
Barengolts, Sergei A. [3 ]
Tsvetoukh, Mikhail M. [4 ]
机构
[1] Inst Electrophys UB RAS, Ekaterinburg, Russia
[2] Ural Fed Univ, Ekaterinburg, Russia
[3] Prokhorov Gen Phys Inst RAS, Moscow, Russia
[4] Lebedev Phys Inst RAS, Moscow, Russia
关键词
vacuum arc; plasma expansion; plasma instability; computer simulation; particle-in-cell; VACUUM-ARC; GENERATION; MECHANISM;
D O I
10.1109/ISDEIV46977.2021.9586863
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A two-dimensional kinetic simulation of the expansion of the current-carrying plasma of the cathode spot of a vacuum arc is carried out. The modeling was performed by Particle-in-Cell and Direct Simulation Monte Carlo methods. The processes of ionization and recombination and Coulomb scattering are considered. Two fundamentally different solutions are demonstrated for an expanding plasma in an external electric field. The first solution is a "quiet" expansion of the plasma at a relatively low current. In which only ion-acoustic current instabilities arise, which do not lead to catastrophic consequences. In this mode, the plasma expands at a speed of similar to 10(6) cm/s, the electron temperature of the plasma reaches 3 eV, and the average charge state of ions (Cu) is similar to 2. In the second case, the current is large enough to excite the Buneman instability, after which the plasma plume decays and ions with relatively high energies scatter towards the anode and cathode.
引用
收藏
页码:268 / 271
页数:4
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