Influence of MHD effects and edge conditions on ITER helium ash accumulation and sustained ignition

M. H. Redi, S. A. Cohen

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Dilution of reacting species by build-up of helium ash and its effect on ignition in the ITER tokamak have been studied in a series of simulations with the one-dimensional BALDUR transport code. Thermal diffusivities, obtained from ITER scaling laws and with radial variations observed in JET, gave τe ≈ 2-4 s. Refuelling of deuterium and tritium maintained constant electron density, while carbon recycling was 100% and the helium ash recycling was varied from 1.0 to 0.5. Including MHD effects, specifically sawteeth and beta limits, we find that ignition can be sustained for 200 s with Rhelium = 0.95. These simulations, the only non-zero-dimensional, time-dependent simulations thus far made for ITER plasmas, emphasize that edge plasma conditions, MHD behavior, and helium particle transport are critical synergistic issues for sustained ignition.

Original languageEnglish (US)
Pages (from-to)262-267
Number of pages6
JournalJournal of Nuclear Materials
Volume176-177
Issue numberC
DOIs
StatePublished - Dec 3 1990

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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