Quasi-symmetry and the nature of radial turbulent transport in quasi-poloidal stellarators
Quasi-symmetric configurations have a better neoclassical confinement compared to that of standard stellarators. The reduction of the neoclassical viscosity along the direction of quasi-symmetry should facilitate the self-generation of zonal flows and, consequently, the mitigation of turbulent fluct...
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| Veröffentlicht in: | Physics of plasmas 2016-10, Vol.23 (10) |
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| container_title | Physics of plasmas |
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| creator | Alcuson, J. A. Reynolds-Barredo, J. M. Bustos, A. Sanchez, R. Tribaldos, V. Xanthopoulos, P. Goerler, T. Newman, D. E. |
| description | Quasi-symmetric configurations have a better neoclassical confinement compared to that of standard stellarators. The reduction of the neoclassical viscosity along the direction of quasi-symmetry should facilitate the self-generation of zonal flows and, consequently, the mitigation of turbulent fluctuations and the ensuing radial transport. Therefore, it is expected that quasi-symmetries should also result in better confinement properties regarding radial turbulent transport. In this paper we show that, at least for quasi-poloidal configurations, the influence of quasi-symmetry on radial transport exceeds the expected reduction of fluctuation levels and associated effective transport coefficients, and that the intimate nature of transport itself is affected. In particular, radial turbulent transport becomes increasingly subdiffusive as the degree of quasi-symmetry becomes larger. This behavior is somewhat reminiscent of what has been previously reported in tokamaks with strong radially sheared zonal flows. |
| doi_str_mv | 10.1063/1.4965231 |
| format | Article |
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A. ; Reynolds-Barredo, J. M. ; Bustos, A. ; Sanchez, R. ; Tribaldos, V. ; Xanthopoulos, P. ; Goerler, T. ; Newman, D. E.</creator><creatorcontrib>Alcuson, J. A. ; Reynolds-Barredo, J. M. ; Bustos, A. ; Sanchez, R. ; Tribaldos, V. ; Xanthopoulos, P. ; Goerler, T. ; Newman, D. E.</creatorcontrib><description>Quasi-symmetric configurations have a better neoclassical confinement compared to that of standard stellarators. The reduction of the neoclassical viscosity along the direction of quasi-symmetry should facilitate the self-generation of zonal flows and, consequently, the mitigation of turbulent fluctuations and the ensuing radial transport. Therefore, it is expected that quasi-symmetries should also result in better confinement properties regarding radial turbulent transport. In this paper we show that, at least for quasi-poloidal configurations, the influence of quasi-symmetry on radial transport exceeds the expected reduction of fluctuation levels and associated effective transport coefficients, and that the intimate nature of transport itself is affected. In particular, radial turbulent transport becomes increasingly subdiffusive as the degree of quasi-symmetry becomes larger. 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| issn | 1070-664X 1089-7674 |
| language | eng |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Configurations Confinement Fluid dynamics Plasma physics Reduction Simulation Stellarators Symmetry Tokamak devices Transport properties Variation |
| title | Quasi-symmetry and the nature of radial turbulent transport in quasi-poloidal stellarators |
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