Tungsten transport in tokamaks: towards real-time kinetic-theory-based plasma performance optimisation - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Conference Papers Year : 2021

Tungsten transport in tokamaks: towards real-time kinetic-theory-based plasma performance optimisation

Abstract

Mechanisms by which tungsten dynamically accumulates in the core of tokamaks are identified in integrated modelling of an ASDEX-Upgrade discharge. Then the same modelling tools are applied to a WEST long pulse L-mode plasma. This modelling work on two disctinct tokamaks also stresses the validaty domain of reduced transport models, in this case QuaLiKiz. At AUG, a ramp-down of the Electron Cyclotron Resonance heating is analysed with a constant background Neutral Beam Injection heating until W accumulation is observed. It is found that the central ratio of the electron to the ion temperature, together with the central source of particles deposited by the beams play a key role. Indeed, while the central particle source yields more centrally peaked density profiles, leading to inward neoclassical convection of tungsten, large Te/Ti can compensate this unfavorable scenario by increasing turbulent particle diffusion. Such competition between Te/Ti and the central particle source is also investigated with fast transport models, in particular within the integrated modelling framework RAPTOR where the turbulent transport is computed from QuaLiKiz 10D neural network. This paves the way towards real-time-kinetic-theory-based plasma performance optimisation. Finally, modelled WEST plasmas with dominant electron heating showed the limits of the implemented collision operator in QuaLiKiz yielding an overstabilisation of Trapped Electron Mode, resulting in mispredictions of the kinetic profiles (electron density and temperature).
Fichier principal
Vignette du fichier
Manuscript_Manas_v2.pdf (697.4 Ko) Télécharger le fichier
Poster_IAEA2020_Manas_v1.pdf (1.32 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

cea-03286833 , version 1 (15-07-2021)

Identifiers

  • HAL Id : cea-03286833 , version 1

Cite

P. Manas, C. Angioni, E. Fable, C. Stephens, J.-F. Artaud, et al.. Tungsten transport in tokamaks: towards real-time kinetic-theory-based plasma performance optimisation. FEC 2020 - IAEA Fusion Energy Conference, May 2021, E-Conference, France. ⟨cea-03286833⟩
100 View
140 Download

Share

Gmail Facebook X LinkedIn More