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X射线弯晶谱仪作为托卡马克装置等离子体温度和旋转速度等参数诊断测量的重要手段之一,通常利用单晶体衍射分光来测量某种特定杂质的特征谱,这也限制了弯晶谱仪所能测量的等离子体温度范围。为解决更高温度等离子体测量问题,有效提高目前弯晶谱仪诊断系统温度测量范围,用双晶体代替原有单晶体,通过选择合适的晶体和Bragg衍射角组合,利用同一个探测器同时测量类氢和类氦的氩离子光谱,实现更高更宽温度范围测量。本文就东方超环(Experimental Advanced Superconducting Tokamak,EAST)弯晶谱仪双晶体应用方面的设计和技术实现进行了阐述,并首次在EAST装置上成功实现了氩离子类氦和类氢谱线的测量,利用类氦线和类氢线拟合得到的氩离子温度非常接近,验证了双晶体结构的可行性。
X-ray crystal-bending spectrometer is one of the most important methods to diagnose and measure parameters such as plasma temperature and rotation speed of tokamak apparatus. Single-crystal diffraction spectroscopy is usually used to measure the characteristic spectrum of a specific impurity, Measurable plasma temperature range. In order to solve the problem of higher temperature plasma measurement and effectively improve the temperature measurement range of the current bending crystal spectrometer diagnostic system, double crystal instead of the original single crystal, by selecting the appropriate combination of crystal and Bragg diffraction angle, the same detector simultaneously measuring class Argon ion spectra of hydrogen and helium-like species enable higher and broader temperature range measurements. In this paper, the design and technical realization of twin crystals in the EDC (Evolution Superconducting Tokamak, EAST) are discussed. For the first time, argon ion-based helium and hydrogen-like spectra are successfully measured on the EAST , The temperature of the argon ions obtained by fitting the helium-like lines and the hydrogen-like lines is very close, which verifies the feasibility of the double crystal structure.