JET internal transport barriers: Experiment vs theory

B. Esposito, F. Crisanti, V. Parail, P. Maget, Y. Baranov, A. Becoulet, C. Castaldo, C.D. Challis, R. De Angelis, X. Garbet, C. Giroud, N. Hawkes, E. Joffrin, X. Litaudon, D. Mazon, M. Riva, K.D. Zastrow

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Abstract

A large variety of JET discharges with internal transport barriers (ITBs) has been analysed in order to determine the main features which characterize turbulence stabilization at the barrier. It is found that the location of barriers is well correlated with regions where the E × B flow shearing rate exceeds the linear growth rate of the ion temperature gradient mode instability (γηi). A key point is the dependence of γηion the magnetic shear: in the discharges of this database the reduction of γηiassociated to very low or null magnetic shear favours the formation of an ITB. After the ITB formation a positive feedback occurs in which the E × B flow shear mechanism has the leading role and the position of the barrier may be no longer linked to the low shear region.
Original languageEnglish
Pages (from-to)933 - 947
Number of pages15
JournalPlasma Physics and Controlled Fusion
Volume45
Issue number6
DOIs
Publication statusPublished - Jun 2003
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Esposito, B., Crisanti, F., Parail, V., Maget, P., Baranov, Y., Becoulet, A., ... Zastrow, K. D. (2003). JET internal transport barriers: Experiment vs theory. Plasma Physics and Controlled Fusion, 45(6), 933 - 947. https://doi.org/10.1088/0741-3335/45/6/307