Effects of Classical and Neo-classical Cross-field Transport of Tungsten Impurity in Realistic Tokamak Geometry

S. Yamoto, Y. Homma, H. Inoue, Y. Sawada, K. Hoshino, A. Hatayama, X. Bonnin, D. Coster, R. Schneider

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The initial simulation study of the neoclassical perpendicular self-diffusion transport in the SOL/Divertor regions for a realistic tokamak geometry with the IMPGYRO code has been performed in this paper. One of the most unique features of the IMPGYRO code is calculating exact Larmor orbit of the test particle instead of assuming guiding center approximation. Therefore, effects of the magnetic drifts in realistic tokamaks are naturally taken into account in the IMPGYRO code. This feature makes it possible to calculate neoclassical transport processes, which possibly become large in the SOL/divertor plasma. Indeed, neoclassical self-diffusion process, the resultant effect of the combination of magnetic drift and Coulomb collisions with background ions, has already been included in the IMPGYRO model. In the present paper, prior to implementing the detailed model of neoclassical transport process into IMPGYRO, we have investigated the effect of neoclassical selfdiffusion in a realistic tokamak geometry with lower single null X-point. We also use a model with guiding center approximation in order to compare with the IMPGYRO full orbit model. The preliminary calculation results of each model have shown differences in the perpendicular average velocity of impurity ions at the top region of the SOL. The mechanism which leads to the difference has been discussed. (

Original languageEnglish
Pages (from-to)646-650
Number of pages5
JournalContributions to Plasma Physics
Volume56
Issue number6-8
DOIs
Publication statusPublished - 2016 Aug 1

Keywords

  • SOL
  • impurity
  • simulation
  • tungsten

ASJC Scopus subject areas

  • Condensed Matter Physics

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    Yamoto, S., Homma, Y., Inoue, H., Sawada, Y., Hoshino, K., Hatayama, A., Bonnin, X., Coster, D., & Schneider, R. (2016). Effects of Classical and Neo-classical Cross-field Transport of Tungsten Impurity in Realistic Tokamak Geometry. Contributions to Plasma Physics, 56(6-8), 646-650. https://doi.org/10.1002/ctpp.201610068