ASCOT modelling of ripple effects on toroidal torque

Antti Salmi*, T. Johnson, V. Parail, Jukka A. Heikkinen, V. Hynönen, T. P. Kiviniemi, T. Kurki-Suonio, JET-EFDA contributors

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)

Abstract

Toroidal field ripple, δ =(Bmax ‐Bmin)/(Bmax +Bmin), in ITER will be relatively large, about 0.5% at the outer midplane. Due to the importance of toroidal rotation on plasma stability and confinement it is important to understand the consequences of a non-negligible ripple field on rotation. Guiding centre following Monte Carlo code ASCOT is used to evaluate the torque on plasma from co-current NBI in presence of toroidal magnetic field ripple. Simulations are made for a JET discharge from 2007 Ripple Campaign aimed to clarify the effect of ripple on fusion plasmas in preparation for ITER. ASCOT results show large reduction of torque from co-NBI and negative torque from thermal ions, which together could create a counter rotating edge plasma.
Original languageEnglish
Pages (from-to)77-81
JournalContributions to Plasma Physics
Volume48
Issue number1-3
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Keywords

  • MC
  • GC orbit following
  • ripple
  • torque

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