Charge exchange recombination spectroscopy on the stellarator W7-AS
Charge exchange recombination spectroscopy on the stellarator W7-AS
复制标题
仿星器 W7-AS 上的电荷交换复合光谱
DOI：
10.1063/1.1147921
复制
发表时间：
1997
影响因子：
1.6
通讯作者：
W. Ohlendorf
中科院分区：
文献类型：
--
作者：
J. Baldzuhn;W. Ohlendorf
在先进的W7-AS恒星加速器中，对本征等离子体杂质进行了主动电荷交换复合光谱研究。测量了He- Ⅱ、B- -V、C- -VI和N- -VII单电荷物种的双重线。脉冲诊断中性束注入器激发了可见或近紫外区的CX谱线。通过关闭和打开光束，可以从感兴趣的信号中减去来自冷等离子体边缘的电子碰撞激发的光谱光强度。传输后的谱线通过成像镜和玻璃纤维通过Czerny-Turner单色仪观察，每个光谱通道的高光谱分辨率可达0.3A。可旋转的反射镜装置允许在等离子体内明确定义的空间位置进行观察。作为探测器，使用光电倍增管阵列和电荷耦合器件摄像系统。通过对CX多普勒线强度、谱线漂移和谱线展宽的光谱测量，我们估算了杂质浓度、旋转速度分布和杂质离子温度。这些参数提供了输运相关的径向电场和离子温度分布。径向离子粒子和热输运以及双极电场对三维星体等离子体的优化起着决定性的作用。
In the advanced stellarator W7-AS, active charge exchange recombination spectroscopy CXRS is performed on intrinsic plasma impurities. Measurements are done on the doublet lines of the singly charged species of He II, B V, C VI, and N VII. A pulsed diagnostic neutral beam injector excites CX spectral lines in the visible or near UV region. By switching the beam off and on, the electron impact excited spectral light intensity from the cold plasma edge can be subtracted from the signal of interest. The spectral lines are observed after transmission by imaging mirrors and glass fibers by means of Czerny–Turner monochromators with high spectral resolution of down to 0.3 A per spectral channel. A turnable mirror device allows for the observation at well defined spatial locations within the plasma. As detectors, photomultiplier arrays, and charge coupled device camera systems are used. By spectral measurement of the CX Doppler line intensity, line shift, and line broadening, we evaluate the impurity density and rotation velocity profile and the impurity ion temperature. These parameters provide the transport relevant radial electric field and the ion temperature profile. The radial ion particle and heat transport together with the ambipolar electric field play a decisive role for the optimization of the three-dimensional stellarator plasma.