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Magnetic order and confinement improvement in high-current regimes of RFX-mod with MHD feedback control (Articolo in rivista)

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Magnetic order and confinement improvement in high-current regimes of RFX-mod with MHD feedback control (Articolo in rivista) (literal)

Anno

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Alternative label

Piovesan P.; Zuin M.; Alfier A.; Bonfiglio D.; Bonomo F.; Canton A.; Cappello S.; Carraro L.; Cavazzana R.; Escande D.F.; Fassina A.; Gobbin M.; Lorenzini R.; Marrelli L.; Martin P.; Martines E.; Pasqualotto R.; Puiatti M.E.; Spolaore M.; Valisa M.; Vianello, N.; Zanza P. and the RFX-mod Team (2009)
Magnetic order and confinement improvement in high-current regimes of RFX-mod with MHD feedback control
in Nuclear fusion
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Piovesan P.; Zuin M.; Alfier A.; Bonfiglio D.; Bonomo F.; Canton A.; Cappello S.; Carraro L.; Cavazzana R.; Escande D.F.; Fassina A.; Gobbin M.; Lorenzini R.; Marrelli L.; Martin P.; Martines E.; Pasqualotto R.; Puiatti M.E.; Spolaore M.; Valisa M.; Vianello, N.; Zanza P. and the RFX-mod Team (literal)

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Note

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1-9; 11-22: Consorzio RFX, EURATOM-ENEA Association, Corso Stati Uniti 4, 35127 Padova, Italy / 10: Physique des Interactions Ioniques et Moléculaires, UMR 6633 - CNRS/Aix - Marseille Université, France / (literal)

Titolo

Magnetic order and confinement improvement in high-current regimes of RFX-mod with MHD feedback control (literal)

Abstract

The RFX-mod machine (Sonato et al 2003 Fusion Eng. Des. 66 161) recently achieved, for the first time in a reversed-field pinch, high plasma current up to 1.6MA with good confinement. Magnetic feedback control of magnetohydrodynamic instabilitieswas essential to reach the goal. As the current is raised, the plasma spontaneously accesses a new helical state, starting from turbulent multi-helical conditions. Together with this raise, the ratio between the dominant and the secondary mode amplitudes increases in a continuous way. This brings a significant improvement in the magnetic field topology, with the formation of helical flux surfaces in the core. As a consequence, strong helical transport barriers with maximum electron temperature around 1 keV develop in this region. The energy confinement time increases by a factor of 4 with respect to the lower-current, multi-helical conditions. The properties of the new helical state scale favourably with the current, thus opening promising perspectives for the higher current experiments planned for the near future. (literal)

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