Experimental and Numerical Investigation of X-point

il y a 2 semaines

Marseille, France CEA - Commissariat à l'Energie Atomique Temps plein

**Domaine**:
Physique du noyau, atome, molécule

**Contrat**:
Stage

**Intitulé de l'offre**:
Experimental and numerical investigation of X-Point Radiator Scenarios in WEST and extrapolation to futu

**Sujet de stage**:
Investigation of the X-point Radiator scenarios in WEST and extrapolation to future DTT device.

**Durée du contrat (en mois)**:
6 mois

**Description de l'offre**:
The understanding and the control of plasma-wall interaction and divertor regimes is crucial for the success of ITER and next step fusion devices. Recently many experimental studies have been performed to investigate the so called X-point Radiator regime consisting in a detached plasma with the majority of the power radiation localized around the X-point, thus decreasing the heat load on the divertor plates. Recently, in WEST such plasma scenario has been developed with noteworthy results: while detached divertor regime with clearly the majority of the radiation concentrated around the X-point is measured at the periphery of the plasma, similarly to the results in other tokamaks, an improved thermal confinement in the plasma core, for both electrons and ions, is observed.
In this internship, we propose to investigate this issue analyzing experimental data with the help of numerical modelling, in particular using the code SOLEDGE3X-EIRENE in transport mode. The impact of drift velocities on the distribution of heat and particle fluxes on the divertor plates will be evaluated, as will that of ballooned radial transport as measured in experiments. Pure deuterium plasma simulations and simulations with nitrogen injection will be carried out. Comparison with Langmuir probe data and visible spectroscopy will be important to assess the relevance of these simulations. The simulations will enable us to study the transition between the attached plasma and the ""X-point radiator"" regime, its stability and robustness, also from a numerical point of view. Finally, the evolution of W sources during this transition will be studied in experimental and simulation data. An extrapolation of these results to future tokamaks such as DTT will be discussed at the end of the internship.
"

**Moyens / Méthodes / Logiciels**:
SOLEDGE3X-EIRENE code, reduced analytical model for plasma transport, data analysis

Ingénieur/master en physique (des plasmas ou fluides, théorique, etc..)

**Localisation du poste**:
**Site**:
Cadarache

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

**Ville**:
Saint Paul Lez Durance

**Langues**:
Anglais (Courant)

**Diplôme préparé**:
Bac+5 - Master 2

**Formation recommandée**:
Physique

**Possibilité de poursuite en thèse**:
Oui

**Demandeur**:
**Disponibilité du poste**:
01/02/2024

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