Radial electric field and plasma confinement

温德尔斯坦VIIAS是德国马克斯-普朗克物理研究所研制的螺旋装置。该装置的中性束能量为50 keV，是电荷交换光谱的理想选择，电荷交换谱线的发射预计将足够大，用于测量。在1999财政年度，我们购买了80 × 80像素的冷却CCD相机作为电荷交换光谱的高时间分辨率探测器。在2000年度，我们购买了法布里-珀罗干涉仪并进行了测试。法布里-珀罗干涉仪是一种通过保持两个反射镜彼此平行，利用光的干涉以非常高的精度传输给定波长的光的系统。因此，系统的光轴应精确对准。设计了与温德尔斯坦VII AS组的光纤束相匹配的光学工作台，并于2001年将CCD相机、法布里-珀罗干涉仪、光纤束组装到光学工作台上，将法布里-珀罗光谱系统运往德国马克斯-普朗克研究所，安装到温德尔斯坦VII AS上。测量所需的对准和校准在实验之前已经完成。2002年度，利用该法布里-珀罗光谱系统，在温德尔斯坦VIFAS中进行了离子温度和径向电场的高时间分辨率测量。2003年度，由于温德尔斯坦VIIAS停止工作，该系统被转移到马克斯-普朗克研究所的ASDEX升级装置中，完成了系统的校准。在2004财政年度，测量了L模式到H模式转变时径向电场的变化。

Wendelstein VIIAS is a helical device in Max-Planck Physics Institute in Germany. This device has neutral beam with a beam energy of 50keV, which is ideal for the charge exchange spectroscopy and emission of charge exchange line is expected to be large enough for the measurements.In the fiscal year 1999, we purchased 80x80 pixel cooled CCD camera as a detector with high time resolution for the charge exchange spectroscopy. In the fiscal year 2000, we purchased Fabry-Perot Interferometer and tested it. The Fabry-Perot Interferometer is a system to transmit the light with a given wavelength using interference of light by keeping the two mirrors parallel to each other with very high accuracy. Therefore the optical axis of the system should be accurately aligned. The optical stage to match the optical fiber bundle from Wendelstein VII AS group was designed.In the fiscal year 2001, The CCD camera, Fabry-Perot interferometer, optical fiber bundle are assembled to the optical stage and the Fabry-Perot spectroscopy system was shipped to Max-Planck Institute in Germany and installed to the Wendelstein VII AS. The alignment and calibration required for the measurements have been done before the experiments. In the fiscal year 2002, ion temperature and radial electric filed were measured with high time resolution in Wendelstein VIFAS using this Fabry-Perot spectroscopy system.In the fiscal year 2003, because the Wendelstein VIIAS was shutdown, the system was transferred and installed to the ASDEX upgrade device in the Max-Planck Institute and the alignment of the system was completed. hi the fiscal year 2004, the change of radial electric filed was at the transition L-mode to H-mode transition was measured.