On current filament formation in arc cathode plasmas
作者： P Serapinas , A V Kupliauskiene
DOI: 10.1088/0022-3727/27/2/022
关键词: Plasma 、 Filamentation 、 Electron temperature 、 Electric current 、 Cathode 、 Atomic physics 、 Electron 、 Atmospheric temperature range 、 Ionization 、 Chemistry
摘要: Electron current stability in relation to filament formation aluminum plasma at densities from 1 1000 atm (105-108 pa) has been studied. momentum relaxation times obtained, including Coulomb and inelastic collisions, were the picosecond smaller time scale, increase temperature interval 104-2*104 K. This results similar electron conductivity dependence. energy losses due ionization excitation of atomic particles range mentioned above are almost constant. At such conditions fluctuations must increase, leading filamentation. The line radiation can work as a stabilizing factor, but it becomes effective only nanosecond scale or low densities. process seems be importance fragmentation arc cathode spot.
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