Role of the edge electric field in the resonant mode-particle interactions and the formation of transport barriers in toroidal plasmas

The impact of an edge radial electric field on the particle orbits and the orbital spectrum in an axisymmetric toroidal magnetic equilibrium is investigated using a guiding centre canonical formalism. Poloidal and bounce/transit-averaged toroidal precession frequencies are calculated, highlighting t...

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Bibliographic Details
Published in:Journal of plasma physics 2024-02, Vol.90 (1), Article 905900110
Main Authors: Anastassiou, Giorgos, Zestanakis, Panagiotis, Antonenas, Yiannis, Viezzer, Eleonora, Kominis, Yannis
Format: Article
Language:English
Subjects:
Electric fields
Energy
Equilibrium
Magnetic fields
Mathematical analysis
Orbits
Particle interactions
Plasma
Spectrum analysis
Toroidal plasmas
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Summary:The impact of an edge radial electric field on the particle orbits and the orbital spectrum in an axisymmetric toroidal magnetic equilibrium is investigated using a guiding centre canonical formalism. Poloidal and bounce/transit-averaged toroidal precession frequencies are calculated, highlighting the role of the radial electric field. The radial electric field is shown to drastically modify the resonance conditions between particles with certain kinetic characteristics and specific perturbative non-axisymmetric modes, and to enable the formation of transport barriers. The locations of the resonances and the transport barriers that determine the particle, energy and momentum transport are shown to be accurately pinpointed in the phase space by employing the calculated orbital frequencies.
ISSN:0022-3778
1469-7807
DOI:10.1017/S0022377824000047