Bell Ronald E, Feder Russell
Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
Rev Sci Instrum. 2010 Oct;81(10):10D724. doi: 10.1063/1.3485027.
A diagnostic suite has been developed to measure the impurity poloidal flow using charge exchange recombination spectroscopy on the National Spherical Torus Experiment. Toroidal and poloidal viewing systems measure all the quantities required to determine the radial electric field. Two sets of up/down symmetric poloidal views are used to measure both the active emission in the plane of the neutral heating beams and the background emission in a radial plane away from the neutral beams. Differential velocity measurements isolate the line-integrated poloidal velocity from apparent flows due to the energy-dependent charge exchange cross section. Six f/1.8 spectrometers measure 276 spectra to obtain 75 active and 63 background channels every 10 ms. The local measurements from a similar midplane toroidal viewing system are mapped into two dimensions to allow the inversion of poloidal line-integrated measurements to obtain local poloidal velocity profiles. The radial resolution after inversion is 0.6-1.8 cm from the plasma edge to the center.
已开发出一套诊断装置，用于在国家球形托卡马克实验中利用电荷交换复合光谱法测量杂质极向流。环向和极向观测系统可测量确定径向电场所需的所有量。两组上下对称的极向视图用于测量中性加热束平面内的有源发射以及远离中性束的径向平面内的背景发射。差分速度测量可将线积分极向速度与由于能量相关的电荷交换截面导致的表观流区分开来。六个f/1.8光谱仪每10毫秒测量276个光谱，以获得75个有源通道和63个背景通道。来自类似中平面环向观测系统的局部测量结果被映射到二维，以便对极向线积分测量进行反演，从而获得局部极向速度剖面。反演后的径向分辨率从等离子体边缘到中心为0.6 - 1.8厘米。
