Landau damping of electrons with bouncing motion in a radio-frequency plasma
Landau damping of electrons with bouncing motion in a radio-frequency plasma
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射频等离子体中电子弹跳运动的朗道阻尼
DOI：
10.1088/1674-1056/ac16cd
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发表时间：
2021
影响因子：
1.7
通讯作者：
黄跃恒
中科院分区：
文献类型：
--
作者：
陶军;项农;胡业民;黄跃恒
利用一维粒子模拟方法研究了射频静电波与电子的相互作用。结果表明，在反射频率的前几个谐波（nω B，n = 1，2，3，.）处可发生反射共振加热。在其中反弹共振与朗道共振重叠的参数区域中，高次谐波反弹共振可以以远低于波相速度的速度将电子加速到朗道共振区域，从而增强波的朗道阻尼。同时，朗道共振可以增加低次谐波反弹共振区的电子数。因此，可以有效地加热电子。这一结果可能适用于低温等离子体放电中的无碰撞电子加热。
One-dimensional particle simulations have been conducted to study the interaction between a radio-frequency electrostatic wave and electrons with bouncing motion. It is shown that bounce resonance heating can occur at the first few harmonics of the bounce frequency (nω b,n = 1,2,3,…). In the parameter regimes in which bounce resonance overlaps with Landau resonance, the higher harmonic bounce resonance may accelerate electrons at the velocity much lower than the wave phase velocity to Landau resonance region, enhancing Landau damping of the wave. Meanwhile, Landau resonance can increase the number of electrons in the lower harmonic bounce resonance region. Thus electrons can be efficiently heated. The result might be applicable for collisionless electron heating in low-temperature plasma discharges.