含杂等离子体中的非线性朗谬尔波和密度坑的形成

采用Ｓａｇｄｅｅｖ势方法，研究含杂等离子体中的非线性朗谬尔波．在小振幅极限下，求出了朗谬尔波包络孤立子的解析解，并讨论了孤立子的特性．对于含有两种离子成份的等离子体，进行了数值研究．研究结果表明，随着杂质含量的增加，临界马赫数将降低，朗谬尔孤立子的宽度变窄，而密度坑加深

Nonlinear Langmuir Waves and Formation of Density Cavities in an Impurity Containing Plasma

Nonlinear Langmuir waves have been studied in an impurity containing plasma using the Sagdeev potential method. In the limit of small amplitude, the analytical solution of Langmuir envelope soliton is discovered, and their properties discussed. Also we have worked numerically on the nonlinear Langmuir waves in a plasma containing two kinds of ions. The results show that with the increase of the impurity ion density, the critical Mach number decreases, the width of the Langmuir envelope soliton becomes narrow, and density cavities deepen.