Qu Huoxiang, Hu Liqun, Cordella F, Claps G, Pacella D, Xu Liqin, Li Erzhong
Institute of Plasma Physics, Chinese Academy of Science, Hefei 230031, People's Republic of China.
ENEA, Fusion and Nuclear Safety Department, C. R. Frascati, Via E. Fermi 45, 004 Frascati (Rome), Italy.
Rev Sci Instrum. 2019 Sep;90(9):093507. doi: 10.1063/1.5111481.
A novel GEM (Gas Electron Multiplier) system has been installed on experimental advanced superconducting tokamak (EAST) which is used for collecting the line integral of the soft X-ray radiation (SXR) through a pinhole-collimated Beryllium window. The sightline of the 2-D GEM system is tangential to the toroidal field. To obtain the local SXR emission, the Tikhonov algorithm is applied for the imaging of the poloidal cross section emission in the vacuum vessel. In the meanwhile, the L-curve method is used to find an optimized solution of the regularization parameters. The tomography reliability has been tested with a known emission function where the error is also discussed. The tomography method has been coded as a graphic user interface for the fast analysis of GEM experimental data. The typical tomography results have been shown for the EAST shot (#79282) in this paper.
一个新型气体电子倍增器（GEM）系统已安装在先进超导托卡马克实验装置（EAST）上，该系统用于通过针孔准直的铍窗口收集软X射线辐射（SXR）的线积分。二维GEM系统的视线与环向场相切。为了获得局部SXR发射，采用蒂洪诺夫算法对真空容器中极向截面发射进行成像。同时，使用L曲线法来找到正则化参数的优化解。利用已知发射函数对层析成像的可靠性进行了测试，并对误差进行了讨论。层析成像方法已被编码为图形用户界面，用于快速分析GEM实验数据。本文展示了EAST放电（#79282）的典型层析成像结果。
