High current regimes in RFX-mod

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

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Optimization of machine operation, including plasma position control, density control and especially feedback control on multiple magnetohydrodynamic modes, has led RFX-mod to operate reliably at 1.5 MA, the highest current ever achieved on a reversed field pinch (RFP). At high current and low density the magnetic topology spontaneously self-organizes in an Ohmical helical symmetry, with the new magnetic axis helically twisting around the geometrical axis of the torus. The separatrix of the island disappears leaving a wide and symmetric thermal structure with large gradients in the electron temperature profile. The new topology still displays an intermittent nature but its overall presence has reached 85% of the current flat-top period. The large gradients in the electron temperature profile appear to be marginal for the destabilization of ion temperature gradient modes on the assumption that ions and electrons have the same gradients. There are indications that higher currents could provide the conditions under which to prove the existence of a true helical equilibrium as the standard RFP configuration. © 2008 IOP Publishing Ltd.
Original languageEnglish
Article number124031
Pages (from-to)-
JournalPlasma Physics and Controlled Fusion
Volume50
Issue number12
DOIs
Publication statusPublished - 2008
Externally publishedYes

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Valisa, M., Bolzonella, T., Buratti, P., Carraro, L., Cavazzana, R., Dal Bello, S., ... Zuin, M. (2008). High current regimes in RFX-mod. Plasma Physics and Controlled Fusion, 50(12), -. [124031]. https://doi.org/10.1088/0741-3335/50/12/124031