We define the safety factor q for the helical plasmas of the experiment RFX-mod by accounting for the actual three-dimensional nature of the magnetic flux surfaces. Such a profile is not monotonic but goes through a maximum located in the vicinity of the electron transport barriers measured by a high resolution Thomson scattering diagnostic. Helical states with a single axis obtained in viscoresistive magnetohydrodynamic numerical simulations exhibit similar nonmonotonic q profiles provided that the final states are preceded by a magnetic island phase, like in the experiment. © 2011 The American Physical Society.
Gobbin, M., Bonfiglio, D., Escande, D., Fassina, A., Marrelli, L., Alfier, A., et al. (2011). Vanishing Magnetic Shear And Electron Transport Barriers In The RFX-Mod Reversed Field Pinch. PHYSICAL REVIEW LETTERS, 106(2) [10.1103/PhysRevLett.106.025001].
Vanishing Magnetic Shear And Electron Transport Barriers In The RFX-Mod Reversed Field Pinch
Martines E;
2011
Abstract
We define the safety factor q for the helical plasmas of the experiment RFX-mod by accounting for the actual three-dimensional nature of the magnetic flux surfaces. Such a profile is not monotonic but goes through a maximum located in the vicinity of the electron transport barriers measured by a high resolution Thomson scattering diagnostic. Helical states with a single axis obtained in viscoresistive magnetohydrodynamic numerical simulations exhibit similar nonmonotonic q profiles provided that the final states are preceded by a magnetic island phase, like in the experiment. © 2011 The American Physical Society.
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