Magnetic self organization, MHD active control and confinement in RFX-mod

L. Marrelli, P. Zanca, M. Valisa, G. Marchiori, A. Alfier, F. Bonomo, M. Gobbin, P. Piovesan, D. Terranova, M. Agostini, C. Alessi, V. Antoni, L. Apolloni, F. Auriemma, O. Barana, P. Bettini, T. Bolzonella, D. Bonfiglio, M. Brombin, A. BuffaA. Canton, S. Cappello, L. Carraro, R. Cavazzana, M. Cavinato, G. Chitarin, S. Dal Bello, A. De Lorenzi, D.F. Escande, A. Fassina, P. Franz, G. Gadani, E. Gaio, E. Gazza, L. Giudicotti, F. Gnesotto, L. Grando, S.C. Guo, P. Innocente, R. Lorenzini, A. Luchetta, G. Malesani, G. Manduchi, D. Marcuzzi, P. Martin, S. Martini, E. Martines, A. Masiello, F. Milani, M. Moresco, A. Murari, L. Novello, S. Ortolani, R. Paccagnella, R. Pasqualotto, S. Peruzzo, R. Piovan, A. Pizzimenti, N. Pomaro, I. Predebon, M.E. Puiatti, G. Rostagni, F. Sattin, P. Scarin, G. Serianni, P. Sonato, E. Spada, A. Soppelsa, G. Spizzo, M. Spolaore, C. Taccon, C. Taliercio, V. Toigo, N. Vianello, P. Zaccaria, B. Zaniol, L. Zanotto, E. Zilli, G. Zollino, M. Zuin

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Abstract

RFX-mod is a reversed field pinch (RFP) experiment equipped with a system that actively controls the magnetic boundary. In this paper we describe the results of a new control algorithm, the clean mode control (CMC), in which the aliasing of the sideband harmonics generated by the discrete saddle coils is corrected in real time. CMC operation leads to a smoother (i.e. more axisymmetric) boundary. Tearing modes rotate (up to 100 Hz) and partially unlock. Plasma-wall interaction diminishes due to a decrease of the non-axisymmetric shift of the plasma column. With the ameliorated boundary control, plasma current has been successfully increased to 1.5 MA, the highest for an RFP. In such regimes, the magnetic dynamics is dominated by the innermost resonant mode, the internal magnetic field gets close to a pure helix and confinement improves. © 2007 IOP Publishing Ltd.
Original languageEnglish
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume49
Issue number12 B
DOIs
Publication statusPublished - 1 Dec 2007
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Marrelli, L., Zanca, P., Valisa, M., Marchiori, G., Alfier, A., Bonomo, F., ... Zuin, M. (2007). Magnetic self organization, MHD active control and confinement in RFX-mod. Plasma Physics and Controlled Fusion, 49(12 B), -. https://doi.org/10.1088/0741-3335/49/12B/S33