An extended kinetic model for the thermal force on impurity particles in weakly collisional plasmas

Joint Special Design Team for Fusion DEMO

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We have developed an extended kinetic model for the thermal force (Formula presented.) on test impurity particles in plasmas. This model makes use of a combination of the plasma ion heat flux qGM derived from the generalized moment equations (E. Zawaideh et al., Phys. Fluids 1988, 31) and the numerical algorithm presented earlier (Y. Homma, A. Hatayama, J. Comput. Phys. 2013, 250). The applicable condition extends from collisional to weakly collisional plasmas, and (Formula presented.) weakens when the plasma collisionality decreases. A test simulation is performed assuming a tentative weakly collisional plasma. The results show that it can have a non-negligible influence on transient impurity transport in a DEMO-scale tokamak to take into account the effect of plasma collisionality in thermal force modelling.

Original languageEnglish
Pages (from-to)629-637
Number of pages9
JournalContributions to Plasma Physics
Volume58
Issue number6-8
DOIs
Publication statusPublished - 2018 Jul 1

Keywords

  • collisionality
  • heat flux limiter
  • impurity
  • thermal force
  • transport simulation

ASJC Scopus subject areas

  • Condensed Matter Physics

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