Study of impurity transport in negative and positive triangularity plasmas H/F

il y a 3 heures

SaintPaullèsDurance, Provence-Alpes-Côte d'Azur, France CEA Temps plein

Nuclear fusion in a tokamak is a promising source of energy. However, a question arises: which plasma configuration is most likely to produce net energy? To contribute to answering this question, during this internship (and possible subsequent PhD), we will study the impact of magnetic geometry, comparison between positive and negative triangularity, on the collisional and turbulent transport of tungsten (W). The performance of a tokamak strongly depends on the energy confinement it can achieve. The latter degrades significantly due to turbulent transport and radiation, primarily from W. On ITER, the tolerated amount of W in the core of the plasma is just 0.3 micrograms in 800 cubic meters of plasma volume. Experiments have shown that the negative triangularity (NT) plasma geometry is beneficial for confinement as it significantly reduces turbulent transport. With this geometry, it is possible to reach confinement levels similar to those of the ITER high confinement configuration (H-mode in positive triangularity), without the need for a minimum power threshold and without the associated plasma edge relaxations. However, questions remain: what level of W transport is found in NT compared to a positive geometry? What level of radiation can be predicted in future NT reactors? To address these questions, the objective of this internship is to develop an algorithm that determines the impurity transport coefficients from experimental measurements and by solving the impurity transport equation.

The internship duration is 6 months.

Moyens / Méthodes / Logiciels
Algorithm development based on open-source impurity transport and radiation code AURORA.

*Profil du candidat*
Physics or engineering backgroud

*Localisation du poste
Site*
Cadarache

*Localisation du poste*
France, Provence-Côte d'Azur, Bouches du Rhône (13)

Ville
Saint paul lez Durance

*Critères candidat
Langues*
Anglais (Courant)

Possibilité de poursuite en thèse
Oui

*Demandeur
Disponibilité du poste*
16/03/2026

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