Feasibility study of direct spectra measurements for Thomson scattered signals for KSTAR fusion-grade plasmas

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Feasibility study of direct spectra measurements of Thomson scattered photons for fusion-grade plasmas is performed based on a forward model of the KSTAR Thomson scattering system. Expected spectra in the forward model are calculated based on Selden function including the relativistic polarization correction. Noise in the signal is modeled with photon noise and Gaussian electrical noise. Electron temperature and density are inferred using Bayesian probability theory. Based on bias error, full width at half maximum and entropy of posterior distributions, spectral measurements are found to be feasible. Comparisons between spectrometer-based and polychromator-based Thomson scattering systems are performed with varying quantum efficiency and electrical noise levels.
Publisher
IOP PUBLISHING LTD
Issue Date
2017-11
Language
English
Article Type
Article; Proceedings Paper
Citation

JOURNAL OF INSTRUMENTATION, v.12

ISSN
1748-0221
DOI
10.1088/1748-0221/12/11/C11022
URI
http://hdl.handle.net/10203/228510
Appears in Collection
NE-Journal Papers(저널논문)
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