Wave phenomena, hot electrons, and enhanced plasma production in a helicon discharge in a converging magnetic field
Wave phenomena, hot electrons, and enhanced plasma production in a helicon discharge in a converging magnetic field
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会聚磁场中螺旋放电中的波动现象、热电子和增强的等离子体产生
DOI：
10.1063/1.1764830
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发表时间：
2004
影响因子：
2.2
通讯作者：
G. Kirichenko
中科院分区：
文献类型：
--
作者：
V. F. Virko;K. P. Shamrai;Y. Virko;G. Kirichenko
检查在不均匀磁场中运行的 m=0 螺旋放电的等离子体特性和波结构。随着天线区域磁场梯度的增加，等离子体的产生迅速增加，密度最大值向下游移动，朝向更强的磁场。探针和光学测量揭示了一层狭窄的热电子（温度高达 7 eV），沿着会聚的磁力线延伸到远离天线的地方。通过磁性和电容探针在热层内检测到具有几个皮肤长度量级的峰值的径向小尺度波结构。基于简单平面模型的计算表明，磁场线与天线下方等离子体表面的倾斜度是射频功率吸收分布和小尺度结构形成的关键因素。如果倾角超过谐振群速度角，近天线吸收就会下降，功率通量会深入......
Plasma characteristics and wave structures are examined for an m=0 helicon discharge operated in a nonuniform magnetic field. With the increase of the magnetic field gradient in the antenna region, plasma production rapidly grows and the density maximum moves downstream, towards the stronger field. Probe and optical measurements reveal a narrow layer of hot electrons (with temperature up to 7 eV) that extends far from the antenna along converging magnetic lines. A radially small-scale wave structure with peaks of the order of a few skin lengths is detected within the hot layer by magnetic and capacitive probes. Computations based on a simple plane model show that the inclination of the magnetic field lines to the plasma surface underneath the antenna is a critical factor for the distribution of the rf power absorption and for the formation of the small-scale structure. If the inclination angle exceeds the resonance group velocity angle, the near antenna absorption falls and the power flux penetrates deep ...