摘要
本文介绍三温与多温电子等离子体自由膨胀的理论模型。自相似解成功地再现了在激光等离子体自由膨胀中离子速度分布呈现的三峰和多峰结构,这些结构已在激光打靶的实验中频繁地观察到。计算结果表明:快离子谱峰值的数目与构成等离子体的电子分量的数目密切相关;相邻两峰之间坑的深度对相应电子温度的比值非常敏感;坑的位置依赖于相应电子数密度的比值,它们也受其它电子分量耦合的影响。最后还讨论了自相似解的适用范围。
A theoretical model for the free expansion of a plasma with three and multiple electron temperatures is developed. The three and multiple peak structures exhibited in ion velocity distributions, which have often been observed experimentally, have been reproduced by the self similar solutions successfully. It is shown that the number of the peaks for ion spectra are closely connected with mumber of electron components including in plasma. The depth of the dip between two adjacent peaks is particularly sensitive to the adjacent electron temperature ratio, the position of the dip depends on corresponding electron number density ratio, they are also affected by coupling of the other electron components. The regions in the parameter space where the self similar solutions are available are discussed.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第7期1098-1105,共8页
Acta Physica Sinica
