Edge localized modes as new bifurcation in Tokamaks

Sanae I. Itoh, Kimitaka Itoh, Atsushi Fukuyama, Masatoshi Yagi

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


A model of giant edge localized modes in tokamaks is developed. The theory of self-sustained turbulence of a current-diffusive ballooning mode is extended. A bifurcation from the H mode to a third state with magnetic braiding, the M mode, is found to occur if the pressure gradient reaches a critical value. Nonlinear excitation of magnetic perturbation takes place, followed by catastrophic increase of transport. With backtransition to the HL mode, a new hysteresis is found in the gradient-flux relation. The process then repeats itself. Avalanche of transport catastrophe across the plasma radius is analyzed.

Original languageEnglish
Pages (from-to)920-923
Number of pages4
JournalPhysical review letters
Issue number6
Publication statusPublished - 1996

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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