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首页> 外文期刊>Physics of plasmas >The effect of energetic electrons on the collisionless fusion plasma sheath in ion cyclotron range of frequencies heating
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The effect of energetic electrons on the collisionless fusion plasma sheath in ion cyclotron range of frequencies heating

机译：能量电子对离子回流频率加热离子回旋源等离子体鞘的影响

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摘要

A one-dimensional model, consisting of a hydrodynamic radio-frequency (RF) sheath model for the ion cyclotron range of frequencies heating and an equivalent circuit model, is used to study the structure of the collisionless RF sheath of a fusion plasma containing a beam of energetic electrons. For various energetic electron concentrations and velocities at the plasma-sheath edge, a set of equations describing the model are solved numerically to obtain the potential drop across the RF sheath and the sheath thickness, as well as the spatiotemporal variations of the potential, the ion density, and the background electron and energetic electron densities inside the sheath. Under the current EAST ion cyclotron range of heating conditions, it is observed that even at small beam fluxes, the potential drop across the sheath is enhanced at any time in an RF cycle for different bulk plasma densities, ion temperatures, and frequencies and amplitudes of the disturbance current. When the energetic electron component is included, the physical sputtering yields of the RF sheath wall materials such as titanium and iron become significant as a result of the enhancement of the drop in the sheath potential.
机译：一维模型，其中包括一个流体动力的射频（RF）鞘用于加热频率和等效电路模型的离子回旋范围模型，用于研究含有光束聚变等离子体的碰撞RF护套的结构的高能电子。为了在等离子体鞘边缘各种高能电子浓度和速度，一组描述的模型方程进行数值求解，得到跨越RF护套和鞘层厚度的电势降，以及潜在的时空变型中，离子密度，并且背景电子和护套内高能电子密度。加热条件下的当前EAST离子回旋范围，可以观察到，即使在小的光束通量，穿过护套的电势降是在一个RF周期对于不同批量的等离子体密度，离子温度，和频率和幅度的任何时间增强干扰电流。当包括高能电子部件，所述RF护套壁材料的物理溅射产额，如钛和铁成为如在鞘层电势下降的增强的结果显著。

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