The decay instability of Langmuir waves in the non-neutral electron plasma column
The decay instability of Langmuir waves in the non-neutral electron plasma column
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非中性电子等离子体柱中朗缪尔波的衰变不稳定性
DOI：
10.1088/0741-3335/39/11/003
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发表时间：
1997
影响因子：
2.2
通讯作者：
H. Higaki
中科院分区：
文献类型：
--
作者：
H. Higaki
在具有圆柱边界的非中性电子等离子体柱中，实验观察到了大振幅朗缪尔波的行为。结果表明，振幅高于阈值的朗缪尔波衰减为较低频率的朗缪尔波。由于色散关系不同于理论上考虑的无界中性等离子体的色散关系，因此朗缪尔波的三波衰减过程成为可能。在这些过程中，由于朗缪尔波的大振幅而产生的边带满足能量和动量守恒关系。这种衰变不稳定性的阈值依赖于等离子体温度，并且随着温度的升高而降低。
The behaviour of large amplitude Langmuir waves is experimentally observed in a non-neutral electron plasma column with a cylindrical boundary. It is found that a Langmuir wave whose amplitude is above a threshold decays into lower frequency Langmuir waves. Since the dispersion relation is different from that of the unbounded neutral plasma, which is theoretically considered, the three-wave decay process of Langmuir waves becomes possible. In these processes, sidebands due to a large amplitude Langmuir wave satisfy the energy and momentum conservation relation. The threshold of this decay instability depends on the plasma temperature and becomes lower as the temperature becomes higher.