A 3D approach to equilibrium, stability and transport studies in RFX-mod improved regimes

D. Terranova, D. Bonfiglio, A.H. Boozer, A.W. Cooper, M. Gobbin, S.P. Hirshman, R. Lorenzini, L. Marrelli, E. Martines, B. Momo, N. Pomphrey, I. Predebon, R. Sanchez, G. Spizzo, M. Agostini, A. Alfier, L. Apolloni, F. Auriemma, M. Baruzzo, T. BolzonellaF. Bonomo, M. Brombin, A. Canton, S. Cappello, L. Carraro, R. Cavazzana, S. Dal Bello, R. Delogu, G. De Masi, M. Drevlak, A. Fassina, A. Ferro, P. Franz, E. Gaio, E. Gazza, L. Giudicotti, L. Grando, S.C. Guo, P. Innocente, D. Lòpez-Bruna, G. Manduchi, G. Marchiori, P. Martin, S. Martini, S. Menmuir, S. Munaretto, L. Novello, R. Paccagnella, R. Pasqualotto, G.V. Pereverzev, R. Piovan, P. Piovesan, L. Piron, M.E. Puiatti, M. Recchia, F. Sattin, P. Scarin, G. Serianni, A. Soppelsa, S. Spagnolo, M. Spolaore, C. Taliercio, M. Valisa, N. Vianello, Z. Wang, A. Zamengo, B. Zaniol, L. Zanotto, P. Zanca, M. Zuin

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Abstract

The full three-dimensional (3D) approach is now becoming an important issue for all magnetic confinement configurations. It is a necessary condition for the stellarator but also the tokamak and the reversed field pinch (RFP) now cannot be completely described in an axisymmetric framework. For the RFP the observation of self-sustained helical configurations with improved plasma performances require a better description in order to assess a new view on this configuration. In this new framework plasma configuration studies for RFX-mod have been considered both with tools developed for the RFP as well as considering codes originally developed for the stellarator and adapted to the RFP. These helical states are reached through a transition to a very low/reversed shear configuration leading to internal electron transport barriers. These states are interrupted by MHD reconnection events and the large Tegradients at the barriers indicate that both current and pressure driven modes are to be considered. Furthermore the typically flat Teprofiles in the helical core have raised the issue of the role of electrostatic and electromagnetic turbulence in these reduced chaos regions, so that a stability analysis in the correct 3D geometry is required to address an optimization of the plasma setup. In this viewtheVMECcode proved to be an effectiveway to obtain helical equilibria to be studied in terms of stability and transport with a suite of well tested codes. In this work, the equilibrium reconstruction technique as well as the experimental evidence of 3D effects and their first interpretation in terms of stability and transport are presented using both RFP and stellarator tools. © 2010 IOP Publishing Ltd.
Original languageEnglish
Article number124023
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume52
Issue number12
DOIs
Publication statusPublished - Dec 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Terranova, D., Bonfiglio, D., Boozer, A. H., Cooper, A. W., Gobbin, M., Hirshman, S. P., ... Zuin, M. (2010). A 3D approach to equilibrium, stability and transport studies in RFX-mod improved regimes. Plasma Physics and Controlled Fusion, 52(12), -. [124023]. https://doi.org/10.1088/0741-3335/52/12/124023