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Charge-exchange spectroseopy at the W7-AS stellarator employing a high-energy Li beam

机译:使用高能锂离子束的W7-AS恒星仪的电荷交换光谱

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Combined measurements of ion density, temperature and poloidal rotation of impurity ions have been carried out in the gradient region of the Wendelstein 7-AS plasma, employing charge-exchange spectroscopy with the high-energy neutral Li beam and C6+/C5+ ions. The present state of the experimental technique is described. Results are obtained in discharges with high central ion temperatures of 13 keV, central electron densities of 7 x 10(19) m(-3). Under these conditions the diagnostic covers a region of about 7 cm radial extent, corresponding to ion temperatures between 50 and 800 eV. Poloidal rotation velocities up to (35 +/- 2.5) km s(-1) were measured in a narrow shear layer at the plasma edge. The contribution of ion diamagnetic and E x B drift is discussed. The radial electric field is derived from a simplified radial force balance equation. [References: 21]
机译:在Wendelstein 7-AS等离子体的梯度区域中,采用电荷交换光谱法对高能中性Li离子束和C6 + / C5 +离子进行了离子密度,温度和杂质离子的倍数旋转的组合测量。描述了实验技术的当前状态。在具有13 keV的高中心离子温度,7 x 10(19)m(-3)的中心电子密度的放电中获得结果。在这些条件下,诊断程序会覆盖大约7厘米径向范围的区域,对应于50至800 eV之间的离子温度。在等离子边缘的狭窄剪切层中测得的极向旋转速度高达(35 +/- 2.5)km s(-1)。讨论了离子抗磁性和E x B漂移的贡献。径向电场是从简化的径向力平衡方程得出的。 [参考:21]

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