关于NSTX-U上快离子D-α信号的散射校正

On the scattering correction of fast-ion D-alpha signals on NSTX-U.

作者信息

Hao G Z, Heidbrink W W, Liu D, Stagner L, Podestà M, Bortolon A

机构信息

University of California, Irvine, California 92697, USA.

Princeton Plasma Physics Laboratory, Princeton, New Jersey 08540, USA.

出版信息

Rev Sci Instrum. 2018 Jun;89(6):063507. doi: 10.1063/1.5031879.

DOI:10.1063/1.5031879

PMID:29960573

Abstract

Analysis of fast-ion D-alpha (FIDA) data on National Spherical Torus Experiment-Upgrade (NSTX-U) shows that the cold D line contaminates the FIDA baseline. The scattered light is comparable to the FIDA emission. A scattering correction is required to extract the FIDA signal. Two methods that relate the scattered light contamination to the intensity of the cold D line are employed. One method uses laboratory measurements with a calibration lamp; the other method uses data acquired during plasma operation and singular value decomposition analysis. After correction, both the FIDA spectra and spatial profile are in better agreement with theoretical predictions.

摘要

对国家球形托卡马克实验升级装置（NSTX-U）上的快离子D-α（FIDA）数据进行分析表明，冷D线会污染FIDA基线。散射光与FIDA发射相当。提取FIDA信号需要进行散射校正。采用了两种将散射光污染与冷D线强度相关联的方法。一种方法使用校准灯进行实验室测量；另一种方法使用等离子体运行期间采集的数据和奇异值分解分析。校正后，FIDA光谱和空间分布与理论预测的吻合度更高。