M. Koubiti
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View article: Machine learning-based tungsten spectroscopy analysis in the WEST tokamak
Machine learning-based tungsten spectroscopy analysis in the WEST tokamak Open
This article presents a machine learning approach to tungsten spectroscopy analysis using measurements performed in WEST tokamak plasmas. We developed a Random Forest algorithm to predict the maximum electron temperature (Temax) based on 4…
View article: Study of line spectra emitted by hydrogen isotopes in tokamaks through Deep-Learning algorithms
Study of line spectra emitted by hydrogen isotopes in tokamaks through Deep-Learning algorithms Open
International audience
View article: Introducing Machine-Learning in Spectroscopy for Plasma Diagnostics and Predictions
Introducing Machine-Learning in Spectroscopy for Plasma Diagnostics and Predictions Open
Artificial Intelligence (AI) and data science techniques are increasingly introduced in physics including plasma physics where Machine Learning (ML) is applied to emission spectroscopy for plasma parameter determination. Recently, the open…
View article: Application of Deep Learning to Spectroscopic Features of the Balmer-Alpha Line for Hydrogen Isotopic Ratio Determination in Tokamaks
Application of Deep Learning to Spectroscopic Features of the Balmer-Alpha Line for Hydrogen Isotopic Ratio Determination in Tokamaks Open
We propose in this paper the use of artificial intelligence, especially deep learning algorithms, for the isotopic ratio determination for hydrogen–deuterium mixtures. Our approach is based on the Balmer-α line emitted by hydrogen and deut…
View article: Modeling of photon trapping effects in high-density divertor plasmas
Modeling of photon trapping effects in high-density divertor plasmas Open
View article: A new analysis of spectral line shapes in white dwarf atmospheres
A new analysis of spectral line shapes in white dwarf atmospheres Open
We present an analysis of hydrogen Balmer line shapes observed in two white dwarf spectra. One spectrum presents singlet lines while the second one presents lines with a triplet structure. The latter is a feature of the presence of a stron…
View article: Modeling of line and continuum spectral emission of hydrogen for recombining plasma conditions
Modeling of line and continuum spectral emission of hydrogen for recombining plasma conditions Open
Balmer line and continuum spectral emission of hydrogen are modeled for detached divertor plasmas (electron density, n e ~10 20 -10 21 m −3 and electron temperature, T e ~1 eV) of Tokamaks. The Stark broadened high-n lines are calculated c…
View article: Modeling of Synthetic Spectra in Tokamak Edge Plasmas
Modeling of Synthetic Spectra in Tokamak Edge Plasmas Open
Atomic processes and plasma surface interactions play a key role in the physics of the edge, divertor and X-point plasmas. Passive spectroscopy is one of the best methods to characterize tokamak edge plasmas. In this work, we report on syn…
View article: Spectral Modeling of Hydrogen Radiation Emission in Magnetic Fusion Plasmas
Spectral Modeling of Hydrogen Radiation Emission in Magnetic Fusion Plasmas Open
Modeling of the spectral line and continuum radiation emitted by hydrogen isotopes in peripheral regions of magnetic fusion is presented through profiles of the Zeeman-Doppler broadened Hα/Dα line and those of the Stark broadened high-n Ba…
View article: H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison
H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison Open
Many spectroscopic diagnostics are routinely used as techniques to infer the plasma parameters from line emission spectra, but their accuracy depends on the numerical model or code used for the fitting process. However, the validation of a…
View article: Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting
Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting Open
Passive plasma spectroscopy is a well-established non-intrusive diagnostic technique. Depending on the emitter and its environment which determine the dominant interactions and effects governing emission line shapes, passive spectroscopy a…
View article: The Fourth Workshop on Lineshape Code Comparison: Line Merging
The Fourth Workshop on Lineshape Code Comparison: Line Merging Open
For a given set of plasma parameters, along a single series (Lyman, Balmer, etc.) the lines with higher principal quantum number (n) lines get progressively wider, closer to each other, and start merging for a certain critical n. In the pr…
View article: Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting
Broadening of the Neutral Helium 492 nm Line in a Corona Discharge: Code Comparisons and Data Fitting Open
Passive plasma spectroscopy is a well-established non-intrusive diagnostic technique. Depending on the emitter and its environment which determine the dominant interactions and effects governing emission line shapes, passive spectroscopy a…
View article: H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison
H-β Line in a Corona Helium Plasma: A Multi-Code Line Shape Comparison Open
Many spectroscopic diagnostics are routinely used as a technique to infer the plasma parameters from line emission spectra but their accuracy depends on the numerical model or code used for the fitting process. However, the validation of a…
View article: The Fourth Workshop on Lineshape Code Comparison: Line Merging
The Fourth Workshop on Lineshape Code Comparison: Line Merging Open
For a given set of plasma parameters, along a single series (Lyman, Balmer etc) the lines with higher
principal quantum number(n) lines get progressively wider, closer to each other,
and start merging for a certain critical n.
In the…
View article: Stark broadening of Balmer lines with low and moderate quantum number in dense divertor plasmas
Stark broadening of Balmer lines with low and moderate quantum number in dense divertor plasmas Open
A computer simulation technique is applied to the modelling of Balmer line shapes in dense divertor conditions. The spectral profile of lines with a high principal quantum number n is sensitive to Stark broadening and can be used as a dens…
View article: Stark-Zeeman Line Shape Modeling for Magnetic White Dwarf and Tokamak Edge Plasmas: Common Challenges
Stark-Zeeman Line Shape Modeling for Magnetic White Dwarf and Tokamak Edge Plasmas: Common Challenges Open
The shape of atomic spectral lines in plasmas contains information on the plasma parameters, and can be used as a diagnostic tool. Under specific conditions, the plasma located at the edge of tokamaks has parameters similar to those in mag…
View article: Stark Broadening from Impact Theory to Simulations
Stark Broadening from Impact Theory to Simulations Open
Impact approximation is widely used for calculating Stark broadening in a plasma. We review its main features and different types of models that make use of it. We discuss recent developments, in particular a quantum approach used for both…
View article: Overview of the TCV tokamak program: scientific progress and facility upgrades
Overview of the TCV tokamak program: scientific progress and facility upgrades Open
The TCV tokamak is augmenting its unique historical capabilities (strong shaping, strong electron heating) with ion heating, additional electron heating compatible with high densities, and variable divertor geometry, in a multifaceted upgr…
View article: A table of Balmer γ line shapes for the diagnostic of magnetic fusion plasmas
A table of Balmer γ line shapes for the diagnostic of magnetic fusion plasmas Open