EAST软X射线光谱仪绝对强度标定  

Absolute intensity calibration of soft X-ray spectrometer on EAST

作　　者：张洪明[1] 沈永才[1] 符佳[1] 李颖颖[1] 熊言威[1] 王福地[1] 吕波[1] 吴振伟[1] 石跃江[2,3] 万宝年[1] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031 [2]中国科技大学,合肥230026 [3]WCI Center for Fusion Theory, National Fusion Research Institute Daejeon, Korea

出　　处：《核聚变与等离子体物理》2013年第4期312-319,共8页Nuclear Fusion and Plasma Physics

基　　金：科技部磁约束核聚变发展研究专项资助项目(2011GB101004,2011GB107003,2012GB101001,2013GB112-004);国家自然科学基金资助项目(10990212,11175208)

摘　　要：采用基于等离子体轫致辐射的方法,完成了EAST软X射线光谱仪的绝对强度标定。首先利用软X射线光谱仪测量了EAST等离子体的轫致辐射的强度,然后基于等离子体电子温度、电子密度、有效电荷数的剖面,计算了等离子体轫致辐射的功率密度剖面。并将其沿软X射线光谱仪的观测弦进行积分,得到了弦积分的轫致辐射强度。最后通过将轫致辐射强度的测量值和计算值进行对比,得到了软X射线光谱仪在10~50范围内的绝对强度标定系数。通过比较不同放电条件下的绝对强度标定系数,发现实验中标定系数变化不大,相对稳定。然后利用标定过的软X射线光谱仪测量CⅥ33.73谱线的辐射强度,并通过非圆截面反演,初步获得了CⅥ33.73绝对辐射强度的径向分布剖面。研究表明,利用轫致辐射对软X射线光谱仪的标定是可行可靠的。获得的杂质辐射绝对强度可结合杂质输运程序进行杂质输运研究。With the calibration method based on the bremsstrahlung of plasma, the absolute intensity calibration has been performed for the soft X-ray spectrometer on EAST. First, the bremsstrahlung intensity of EAST plasma has been measured with soft X-ray spectrometer. After that, the profile of the power density of bremsstrahlung has been calculated, based on the measured profiles of electron temperature, electron density and effective charge number, which are provided by other diagnostics. Then, the power density integrated along the sightline of soft X-ray spectrometer to calculate integrated intensity has been obtained. At last, by comparing the measurement and the calculated results of the intensity of bremsstrahlung, the absolute intensity calibration factor in the range of 10~50 has been obtained. After completing the absolute intensity calibration, the emission intensity of CⅥ at 33.73 has been measured with soft X-ray spectrometer. Combined with the calibration factor, the vertical profile of the emission intensity has been inferred from the measurement. Then, the radial profile has been obtained with the Abel inversion taking into count of the asymmetry of high filed side and low field side of the plasma cross section. This study shows the absolute intensity calibration method based on the bremsstrahlung is viable for the spectrometer working in the soft X-ray range. The obtained emission intensity of impurity can be used to study the impurity transport by combining some simulation codes.

关 键 词：软X射线光谱仪 绝对强度标定 轫致辐射 杂质辐射强度 

分 类 号：TL816.1[核科学技术—核技术及应用]