Large-area high-density helicon plasma sources
Large-area high-density helicon plasma sources
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DOI：
10.1088/0963-0252/19/3/034018
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发表时间：
2010-05
影响因子：
3.8
通讯作者：
S. Shinohara;T. Motomura;K. Tanaka;T. Tanikawa;K. P. Shamrai
中科院分区：
文献类型：
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作者：
S. Shinohara;T. Motomura;K. Tanaka;T. Tanikawa;K. P. Shamrai
高密度（1012-1013 cm-3）的螺旋等离子体产生使用两个不同的，但类似的设备，其直径非常大，分别为40厘米和74厘米，已被表征。已经详细研究了颗粒生产效率的缩放到低纵横比（直径与轴向长度的比率）区域，低至0.075。已经发现，减小该比率表明了所激发的射频（rf）场的驻波状图案。的电子密度和射频波场的空间分布的测量，这些配置文件的控制通过改变激励天线附近的磁场配置的有效性。最后，高β等离子体的β高达0.8，表现出抗磁特性，其中β是等离子体压力与磁压力的比值，已经在低磁场下产生。
High-density (1012–1013 cm−3) helicon plasmas produced using two different but similar devices whose diameters are very large, 40 cm and 74 cm, respectively, have been characterized. A scaling of the particle production efficiency has been investigated in detail into a low aspect ratio (the ratio of the diameter to the axial length) region down to 0.075. It has been found that reducing this ratio manifests the standing wave-like patterns of the excited radio frequency (rf) fields. Spatial profiles of the electron density and the rf wave fields are measured, showing the effectiveness of the control of these profiles by changing the magnetic field configurations near the excitation antenna. Finally, high-beta plasmas with up to β ∼ 0.8, that exhibit diamagnetic character, where β is the ratio of the plasma pressure to the magnetic pressure, have been produced with low magnetic fields.