Quasi-single helicity states in the reversed field pinch: Beyond the standard paradigm

P. Martin, A. Buffa, S. Cappello, F. D'Angelo, D.F. Escande, P. Franz, L. Marrelli, E. Martines, S. Ortolani, G. Spizzo, R. Bilato, T. Bolzonella, S. Costa, A. Murari, R. Paccagnella, R. Pasqualotto, D. Terranova, P. Zanca

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This paper reports experimental results showing that coherent helical structures are formed in the reversed field pinch (RFP) self-organizing plasma core as a result of transitions to states where the n-spectrum of the m=1 modes is dominated by a single (1,nmax) geometrical helicity. These states are dubbed quasi-single helicity (QSH) states. Their magnetic and thermal properties measured in the reverse field experiment (RFX) [G. Rostagni, Fusion Eng. Des. 25, 301 (1995)] device are described. The present theoretical understanding of QSH states is discussed and some recent theoretical results are presented. The role of aspect ratio is discussed. These results represent a significant step to open a path beyond the standard paradigm that a bath of magnetohydrodynamic (MHD) modes is intrinsic to the RFP.
Original languageEnglish
Pages (from-to)1984 - 1992
Number of pages9
JournalPhysics of Plasmas
Issue number5
Publication statusPublished - 1 May 2000
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Martin, P., Buffa, A., Cappello, S., D'Angelo, F., Escande, D. F., Franz, P., ... Zanca, P. (2000). Quasi-single helicity states in the reversed field pinch: Beyond the standard paradigm. Physics of Plasmas, 7(5), 1984 - 1992. https://doi.org/10.1063/1.874054