Study of slow n = 1, m = 1 reconnection in JET discharges with low central magnetic shear

P. Buratti, B. Alper, S.V. Annibaldi, A. Becoulet, P. Belo, J. Bucalossi, M. De Baar, P. De Vries, D. Frigione, C. Gormezano, E. Joffrin, P. Smeulders

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Abstract

Experiments designed for the attainment of the hybrid advanced mode of operation in JET revealed the existence of a new form of reconnecting modes with toroidal number n = 1 and poloidal number m = 1, which have the same radial structure as sawtooth precursors but are characterized by small growth rate and low saturation amplitude. These modes develop in repetitive cycles with typical growth times of 100 ms. Temperature perturbations are not in the form of sawteeth; in fact, there is slow and mild erosion of the central temperature without any crash. Comparison with theory of m = 1 modes indicates that the slow growth observed in the hybrid regime is caused by low magnetic shear (a measure of the radial variation of field line inclination) and possibly by diamagnetic effects in the plasma core. © 2006 IOP Publishing Ltd.
Original languageEnglish
Article number009
Pages (from-to)1005 - 1018
Number of pages14
JournalPlasma Physics and Controlled Fusion
Volume48
Issue number7
DOIs
Publication statusPublished - 1 Jul 2006
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Buratti, P., Alper, B., Annibaldi, S. V., Becoulet, A., Belo, P., Bucalossi, J., ... Smeulders, P. (2006). Study of slow n = 1, m = 1 reconnection in JET discharges with low central magnetic shear. Plasma Physics and Controlled Fusion, 48(7), 1005 - 1018. [009]. https://doi.org/10.1088/0741-3335/48/7/009