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在Tokamak装置极向场分布的测量中,远红外(FIR)激光偏振干涉是一种可行的办法,它通过探测束偏振面的法拉第旋转测量极向场B_p的变化。原则上沿着等离子体截面不同弦同时进行偏振面旋转测量,结合电子密度分布数据就可推演出极向磁场的分布,并进一步获得等离子体电流密度分布的信息。国际上很多大中型托马克装置例如JET、TFTR、TEXTOR均建立了多道FIR激光干涉/偏振仪系统,对极向场进而对电流密度分布实现了测量。早期法国TFR 600装置曾使用HCN激光干涉仪的修改道完成了法拉第旋转测量,德国TEX-
Far-infrared (FIR) laser polarization interference is a feasible method for measuring the polar field distribution of the Tokamak device. It measures the change of the polar field B_p by detecting the Faraday rotation of the polarization plane of the beam. In principle, the rotation of the polarization plane along different sections of the plasma cross-section can be measured at the same time, and the distribution of the polar magnetic field can be derived by combining the electron density distribution data, and the information of the plasma current density distribution can be further obtained. Many large and medium-sized international Torch devices such as JET, TFTR, TEXTOR have established a number of FIR laser interferometer / polarimeter system, the polar field and thus the current density distribution was measured. The earlier French TFR 600 installation used the modified HCN laser interferometer to complete Faraday rotation measurements. The German TEX-