Formation and collapse of an internal transport barrier

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

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Abstract

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
Volume40
Issue numberSPEC. ISS. 3
DOIs
Publication statusPublished - Jan 1 2000

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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. https://doi.org/10.1088/0029-5515/40/3Y/332