Simulation of cathode plasma expansion in magnetically insulated transmission lines
ICOPS) held with 2014 IEEE International Conference High-Power Particle Beams（2014）
摘要
We describe a novel algorithm for the simulation of cathode plasmas in particle-in-cell (PIC) codes, and have applied the algorithm to investigate cathode plasma expansion in magnetically-insulated transmission lines (MITLs) using the PIC code LSP. The MITL electron current is modeled by a fully-kinetic electron species. Electron and ion macroparticles, both modeled as fluid species, form a plasma which is initially localized at the cathode surface. Energetic plasma electron particles can be converted to kinetic electrons to resupply the electron flux at the plasma edge (the “effective” cathode). Using this model, we compare results for the time evolution of the cathode plasma and MITL electron flow with a simplified (isothermal) diffusion model. Simulations in 1D show a slow diffusive expansion of the plasma from the cathode surface. But in multiple dimensions the plasma can expand much more rapidly due to anomalous diffusion caused by a flute instability. We also present some preliminary results of diode simulations with both cathode and anode plasmas modeled self-consistently.
更多查看译文
关键词
cathodes,flute instability,plasma boundary layers,plasma flow,plasma simulation,plasma transport processes,anode plasma,anomalous diffusion,cathode plasma expansion simulation,cathode surface,diode simulations,electron flow,electron flux,electron macroparticles,energetic plasma electron particles,fluid species,flute instability,fully-kinetic electron species,ion macroparticles,kinetic electrons,magnetically insulated transmission line electron current,multiple dimensions,particle-in-cell code LSP,plasma edge,simplified diffusion model,slow diffusive expansion,time evolution
AI 理解论文
溯源树
样例
生成溯源树，研究论文发展脉络
Chat Paper
正在生成论文摘要