TY - JOUR
T1 - Application of multiple regression for sensitivity analysis of helium line emissions to the electron density and temperature in Magnum-PSI
AU - Kajita, Shin
AU - Nishijima, Daisuke
AU - Fujii, Keisuke
AU - Akkermans, Gijs
AU - Van Der Meiden, Hennie
N1 - Publisher Copyright:
© 2021 Institute of Physics Publishing. All rights reserved.
PY - 2021/5
Y1 - 2021/5
N2 - Helium line intensities have been utilized to measure the electron density, ne, and temperature, Te, by comparing measured line intensities to a collisional-radiative model (CRM). In this study, we use multiple regression analysis to train a model of the helium line intensities and ne/Te obtained from a Thomson scattering system in the linear plasma device Magnum-PSI; based on the trained model, we predict ne and Te from line intensities. We show that this method can also obtain radial profiles of ne and Te. We discuss appropriate selections of line pairs for the prediction based on the multiple regression analysis. A big advantage of this method against the standard technique using CRM is that modeling of atomic population distributions is not required, which sometimes needs to take into account various effects such as radiation trapping, transport of helium atoms in metastable states, etc.
AB - Helium line intensities have been utilized to measure the electron density, ne, and temperature, Te, by comparing measured line intensities to a collisional-radiative model (CRM). In this study, we use multiple regression analysis to train a model of the helium line intensities and ne/Te obtained from a Thomson scattering system in the linear plasma device Magnum-PSI; based on the trained model, we predict ne and Te from line intensities. We show that this method can also obtain radial profiles of ne and Te. We discuss appropriate selections of line pairs for the prediction based on the multiple regression analysis. A big advantage of this method against the standard technique using CRM is that modeling of atomic population distributions is not required, which sometimes needs to take into account various effects such as radiation trapping, transport of helium atoms in metastable states, etc.
KW - Helium
KW - Multiple regression
KW - Optical emission spectroscopy
KW - Spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85105105202&partnerID=8YFLogxK
U2 - 10.1088/1361-6587/abf36e
DO - 10.1088/1361-6587/abf36e
M3 - Article
AN - SCOPUS:85105105202
SN - 0741-3335
VL - 63
JO - Plasma Physics and Controlled Fusion
JF - Plasma Physics and Controlled Fusion
IS - 5
M1 - 055018
ER -