In-situ Absolute Intensity Calibration of Fast-Response Extreme Ultraviolet Spectrometer on Experimental Advanced Superconducting Tokamak

HFCAS OpenIR

	In-situ Absolute Intensity Calibration of Fast-Response Extreme Ultraviolet Spectrometer on Experimental Advanced Superconducting Tokamak
其他题名	In-situ Absolute Intensity Calibration of Fast-Response Extreme Ultraviolet Spectrometer on Experimental Advanced Superconducting Tokamak
	2018
发表期刊	SPECTROSCOPY AND SPECTRAL ANALYSIS
ISSN	1000-0593
摘要	In the magnetic confinement device, the existence of impurity, especially the high-Z impurity, will cause the large enhancement of the radiation power loss and serious degradation of plasma performance. Quantitative study of impurity behavior requires the absolute intensity calibration of spectroscopy diagnostic system for impurity firstly. In this work, a precise in-situ absolute intensity calibration of a fast-response flat-field extreme ultraviolet (EUV) spectrometer is carried out by using different methods in different wavelength range. In the range of 20 similar to 150 angstrom, the sensitivity curve is obtained by comparing EUV brems-strahlung between the measurement and calculation, in which the latter one is calculated by combining the profile of electron density, temperature and the effective charge Z(eff) deduced from the absolutely measured visible bremsstrahlung intensity in the range of (523 +/- 1) nm. The measured EUV bremsstrahlung intensity is the continuous counts subtracting the background noise at different wavelengths from the detector. In the longer wavelength range, i.e. 130 similar to 280 angstrom, the relative intensity calibration is addressed by comparing the measured and simulated line intensity ratio of resonance transition doubles from Li-like ions, e.g. Fe23+, Cr21+ Ar15+, and Na-like ions, e.g. Mo31+, Fe15+, with the transition of 1s(2) 2s(2) S-1/2-1s(2) 2p(2) P-1/2,P- (3/2) and 2p(6) 3s(2) S-1/2-2p(6) 3p(2) P-1/2.3/2, respectively. For the simulated line intensity ratio, it is modeled using the collisional-radiative model, in which the energy level populations are determined by electron collisional excitation, de-excitation and radiative decay. By combining those two methods, the absolute calibration of EUV spectrometer is achieved in the wavelength range of 20 similar to 280 angstrom. In addition, the uncertainty of the calibration is estimated to be about 30%, considering the measurement uncertainties of electron temperature, electron density and bremsstrahlung. Based on the obtained absolute sensitivity curve, the quantitative study of impurity concentration is being carried out by comparing the absolute measurement of emission line intensity with that simulated by combining the one-dimensional impurity transport simulation and ADAS (Atomic Data and Analysis Structure) database.
关键词	EAST EAST Extreme Ultraviolet (EUV) spectrometer Bremsstrahlung The absolute calibration The relative calibration The branching ratio
收录类别	CSCD
语种	英语
CSCD记录号	CSCD:6220729
引用统计	被引频次：4[CSCD] [CSCD记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/54956
专题	中国科学院合肥物质科学研究院
推荐引用方式 GB/T 7714	. In-situ Absolute Intensity Calibration of Fast-Response Extreme Ultraviolet Spectrometer on Experimental Advanced Superconducting Tokamak[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2018,38.
APA	(2018).In-situ Absolute Intensity Calibration of Fast-Response Extreme Ultraviolet Spectrometer on Experimental Advanced Superconducting Tokamak.SPECTROSCOPY AND SPECTRAL ANALYSIS,38.
MLA	"In-situ Absolute Intensity Calibration of Fast-Response Extreme Ultraviolet Spectrometer on Experimental Advanced Superconducting Tokamak".SPECTROSCOPY AND SPECTRAL ANALYSIS 38(2018).