Multi-physics modeling of the long-term evolution of helium plasma exposed surfaces

A. Lasa, J. M. Canik, S. Blondel, T. R. Younkin, D. Curreli, J. Drobny, P. Roth, M. Cianciosa, W. Elwasif, D. L. Green, B. D. Wirth

Research output: Contribution to journalConference articlepeer-review

Abstract

In this manuscript we introduce a simulation tool-suite for predicting plasma-surface interactions (PSI), which aims to predict the evolution of the plasma-facing surfaces that continually change due to exposure to fusion plasmas. A comprehensive description of PSI involves a wide range of physical phenomena, of which we include components for (a) the gas implantation and its dynamic evolution below the divertor surface; (b) erosion of wall material; (c) transport and re-deposition of the eroded impurities; and (d) the scrape-off layer plasma including fuel ions and extrinsic impurities. These components are integrated to predict changes in surface morphology and fuel recycling, and the effect of material erosion and re-deposition in fuel retention. Integrated simulations for ITER-like parameters in a helium plasma environment are presented, focused on the response of the tungsten divertor. The model is also applied to predicting the response of the tungsten surface pre-damaged by He plasma, to burning plasma operations. This case further demonstrates the capability to model the effect of sub-surface helium dynamics, which include helium nucleation, clustering and the bursting of over-pressurized bubbles, its impact on fuel recycling as well as the effect of sputtering on the surface evolution.

Original languageEnglish (US)
Article number014041
JournalPhysica Scripta
Volume2020
Issue numberT171
DOIs
StatePublished - Jan 1 2020
Event17th International Conference on Plasma-Facing Materials and Components for Fusion Applications, PFMC 2019 - Eindhoven, Netherlands
Duration: May 20 2019May 24 2019

Keywords

  • Helium
  • Impurity transport
  • Plasma sheath
  • Plasma surface interactions
  • Tungsten

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Mathematical Physics
  • Condensed Matter Physics

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