Model of the h-mode in tokamaks

S. I. Itoh, K. Itoh

Research output: Contribution to journalArticle

111 Citations (Scopus)

Abstract

The paper presents a theoretical model of the H-mode in tokamaks which is based on the bifurcation of the radial electric field at the plasma edge. The electric field is determined by the balance of the non-ambipolar fluxes of ions and electrons at the edge. It is found that bifurcations of the radial electric field, the particle flux and the convective energy loss occur when the edge gradient reaches a critical value. This is attributed to L-H or H-L transition. The critical conditions are examined and the role of neutral particles as well as the effect of impurities are incorporated in the model. Combining the confinement scaling laws for both the core plasma and the scrape-off layer plasma, the threshold power for the transition is derived. The temporal evolution associated with the transition is studied.

Original languageEnglish
Pages (from-to)1031-1045
Number of pages15
JournalNuclear Fusion
Volume29
Issue number6
DOIs
Publication statusPublished - Jun 1989

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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