Non-linear MHD modelling of ELM triggering by pellet injection in DIII-D and implications for ITER

S. Futatani, G. Huijsmans, A. Loarte, L.R. Baylor, N. Commaux, T.C. Jernigan, M.E. Fenstermacher, C. Lasnier, T.H. Osborne, B. Pegourié

Research output: Contribution to journalArticleAcademicpeer-review

37 Citations (Scopus)

Abstract

Edge localized mode (ELM) triggering by pellet injection in the DIII-D tokamak has been simulated with the non-linear MHD code JOREK with a view to validating its physics models. JOREK has been subsequently applied to evaluate the requirements for ELM control by pellet injection in ITER. JOREK modelling results for DIII-D show that the key parameter for the triggering of ELMs by pellets is the value of the localized pressure perturbation caused by pellet injection which leads to a threshold minimum pellet size for a given injection velocity, injection geometry and H-mode plasma characteristics. The minimum pellet size for ELM triggering is found to depend on injection geometry with the largest value being required for injection at the outer midplane, intermediate for injection near the X-point and the smallest one for injection at the high-field side. The first results of studies for ELM triggering by pellet injection in ITER 15 MA Q = 10 plasmas with the foreseen injection geometry in ITER are presented.
Original languageEnglish
Pages (from-to)073008
Number of pages21
JournalNuclear Fusion
Volume54
Issue number7
DOIs
Publication statusPublished - 2014
Externally publishedYes

Keywords

  • elm
  • elm control
  • elm triggering
  • in colour only in
  • iter
  • non-linear mhd
  • pellet pacing
  • some figures may appear
  • the online journal

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