Electrostatic degrees of freedom in non-Maxwellian plasma
Electrostatic degrees of freedom in non-Maxwellian plasma
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非麦克斯韦等离子体中的静电自由度
DOI：
10.1063/1.1462031
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发表时间：
2001
影响因子：
2.2
通讯作者：
W. A. Noonan
中科院分区：
文献类型：
--
作者：
F. Skiff;H. Gunell;Ashis Bhattacharjee;C. Ng;W. A. Noonan
离子速度分布函数的详细测量用于测试稍微非麦克斯韦等离子体的静电自由度的表示。发现流体理论不能很好地描述数据，因为存在多个紧密间隔的动静电模式。理论上，新的波分支似乎应该以弱阻尼模式存在，即使有Te ~ Ti。离散色散关系求和和Case-Van Kampen谱表示都可以用来提供数据的工作描述，但后者有一定的优势。
Detailed measurements of the ion velocity distribution function are used to test representations of the electrostatic degrees of freedom of slightly non-Maxwellian plasmas. It is found that fluid theory does not describe the data very well because there exist multiple closely spaced kinetic electrostatic modes. New wave branches appear that theoretically should persist as weakly damped modes even with Te∼Ti. Both a sum over discrete dispersion relations and the Case–Van Kampen spectral representation can be used to provide working descriptions of the data, but the latter has certain advantages.