Formation and collapse of an internal transport barrier

A. Fukuyama, K. Itoh, S. I. Itoh, M. Yagi

Research output: Contribution to journalArticle

8 Citations (Scopus)


A theoretical model of an internal transport barrier (ITB) is developed. The transport model based on the self-sustained turbulence theory of the current diffusive ballooning mode is extended to include the effects of E×B rotation shear. Delayed formation of the ITB is observed in transport simulations. The influence of finite gyroradius is also discussed. Simulation of the current ramp-up experiment successfully described the radial profile of density, temperature and safety factor. A model of ITB collapse due to magnetic braiding is proposed. Sudden enhancement of transport triggered by overlapping of magnetic islands terminates the ITB. The possibility of destabilizing global low n modes is also discussed.

Original languageEnglish
Pages (from-to)685-692
Number of pages8
JournalNuclear Fusion
Issue numberSPEC. ISS. 3
Publication statusPublished - Jan 1 2000


All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Fukuyama, A., Itoh, K., Itoh, S. I., & Yagi, M. (2000). Formation and collapse of an internal transport barrier. Nuclear Fusion, 40(SPEC. ISS. 3), 685-692.