EAST托卡马克电荷交换复合光谱诊断的绝对强度标定  

Absolute intensity calibration of the charge exchange recombination spectroscopy system on EAST

作　　者：张镱[1,2] 李颖颖[2] 符佳[2] 尹相辉[1,2] 吕波[2] 王秋平[3] 余羿[1] 石跃江[1,4] 叶民友[1] 

机构地区：[1]中国科学技术大学核科学技术学院,合肥230026 [2]中国科学院等离子体物理研究所,合肥230031 [3]中国科学技术大学国家同步辐射实验室,合肥230026 [4]Department of Nuclear Engineering, Seoul National University

出　　处：《核技术》2015年第7期69-74,共6页Nuclear Techniques

基　　金：国家磁约束核聚变发展研究专项(No.2012GB101001;No.2013GB112003;No.2013GB112004);国家自然科学基金(No.11405212;No.11175208;No.11275233);中日韩A3前瞻计划项目(No.11261140328);合肥物质科学技术中心方向项目培育基金(No.2014FXCX003)资助

摘　　要：电荷交换复合光谱(Charge e Xchange Recombination Spectroscopy,CXRS)诊断系统主要用于等离子体旋转速度和离子温度的测量。CXRS诊断的另外一个重要应用是通过测量光谱的绝对强度来确定杂质离子的密度,因此需要对系统进行绝对强度标定。在实验前通过精确校准过且各个波长强度已知的积分球光源对系统进行初步的标定;在实验过程中又利用托卡马克装置中等离子体自身产生的轫致辐射对系统的强度标定进行了进一步的检验。通过比较轫致辐射强度的实验测量值和理论计算值,可以发现两种方法得到的结果虽然存在一定的误差,但是它们的趋势是一致的。实验结果表明,利用轫致辐射进行绝对强度标定是可行的。Background： The toroidal charge exchange recombination spectroscopy （CXRS） diagnostic was recently deployed on Experimental Advanced Superconducting Tokamak （EAST）. The main purpose of this diagnostic system is the profiles of plasma temperature and velocity profiles. The system was calibrated preliminarily by using an integrating sphere lamp whose wavelength and intensity was checked precisely by the manufacturer. As the integrating sphere lamp can only be used before or after the experiment, the real time calibration for the CXRS diagnostic system becomes very important. Purpose： This study aims to use CXRS to measure impurity density, which requires the absolute intensity of the spectrum, so the system must be absolutely calibrated. Methods： The intensity of bremsstrahlung emitted from the plasma during the CXRS experiments was measured. Theoretical computations were performed using relevant parameters of EAST plasma. Results： Compared the measurement results of bremsstrahlung intensity to the theoretical calculation whose parameters were provided by other diagnostic systems, it is shown that errors were in the same order of magnitude and very common in the plasma diagnostic. Conclusion： The experimental results showed that absolute intensity calibration based on the bremsstrahlung is feasible and it gives a possible way for the real time calibration. In the future experiment, the CXRS diagnostic system will adopt this method.

关 键 词：离子体诊断 电荷交换复合光谱 轫致辐射 强度标定 

分 类 号：TL651[核科学技术—核技术及应用] TL626