Multiple bifurcation of the radial electric field structure induced by electrodes in tokamaks

N. Kasuya, K. Itoh, Y. Takase

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)


An improved confinement state can be attained by imposing a radial electric field at the plasma edge. This is characterized by a change of the Er structure. A charge conservation equation with a diffusion term has been solved to explain this mechanism. Various types of Er structures with multiple peaks are allowed for the same boundary condition. The relationship between the voltage and the current is obtained by numerical calculation. Both stable and unstable regions exist in the stationary solutions and their boundary points are critical points for transition from one state to another. Multiple transitions and hysteresis are predicted. The magnitude of the collision frequency affects the existence of solutions with multiple peaks.

Original languageEnglish
Article number329
Pages (from-to)A287-A292
JournalPlasma Physics and Controlled Fusion
Issue number5 A
Publication statusPublished - May 2002
Externally publishedYes
Event8th IAEA Technical Committee Meeting on H-Mode Physics and Transport Barriers - Toki, Japan
Duration: Sept 5 2001Sept 7 2001

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics


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