Selective Excitation of Low Frequency Drift Waves by Density Modulation and Parametric Excitation of Higher Frequency Mode

Subir Biswas; Debjyoti Basu; Rabindranath Pal; Nikhil Chakrabarti

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Selective Excitation of Low Frequency Drift Waves by Density Modulation and Parametric Excitation of Higher Frequency Mode

机译：通过密度调制和高频模式的参数激励对低频漂移波进行选择性激励

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Excitation of low frequency drift waves in a radial region of a weak density gradient is demonstrated experimentally by strong temporal modulation of the plasma density. Though a parallel electron current can destabilize drift waves throughout the region, we observe mode selection at the resonant location matching the frequency of modulation. Parametric mode-mode interaction among two excited drift modes to destabilize a higher frequency one is reported under the specific condition of the growth rate. Theoretically estimated growth rates fit well with the experiment.

机译：通过对等离子体密度的强时间调制，通过实验证明了在弱密度梯度的径向区域中低频漂移波的激励。尽管平行的电子电流可以使整个区域的漂移波不稳定，但我们在与调制频率匹配的谐振位置观察到模式选择。据报道，在特定的生长速率条件下，两个激发的漂移模式之间的参数模式-模式相互作用使更高的频率不稳定。从理论上估计的增长率非常适合该实验。

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来源
《Physical review letters》 |2013年第11期|115004.1-115004.5|共5页
作者
Subir Biswas; Debjyoti Basu; Rabindranath Pal; Nikhil Chakrabarti;
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作者单位

Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;

Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India,Instituto de Ciencias Nucleares-UNAM, Mexico D.F., 04510, Mexico;

Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;

Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700064, India;

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正文语种 eng
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drift waves; plasma turbulence;

机译：漂波等离子体湍流;

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Selective Excitation of Low Frequency Drift Waves by Density Modulation and Parametric Excitation of Higher Frequency Mode

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