Criteria for the importance of multi-scale interactions in turbulent transport simulations
Turbulent transport simulations have been used to develop criteria that indicate when multi-scale turbulent phenomena are important in tokamak plasmas. Twelve experimental plasma discharges from the Alcator C-Mod and ASDEX Upgrade tokamaks are compared to ion- and multi-scale simulations with the Tr...
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| Veröffentlicht in: | Plasma physics and controlled fusion 2019-08, Vol.61 (8), p.85022 |
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| creator | Creely, A J Rodriguez-Fernandez, P Conway, G D Freethy, S J Howard, N T White, A E |
| description | Turbulent transport simulations have been used to develop criteria that indicate when multi-scale turbulent phenomena are important in tokamak plasmas. Twelve experimental plasma discharges from the Alcator C-Mod and ASDEX Upgrade tokamaks are compared to ion- and multi-scale simulations with the Trapped Gyro-Landau Fluid (TGLF) turbulence code. Multi-scale TGLF agrees with all available validation constraints (ion heat flux, electron heat flux, electron temperature fluctuations, and electron perturbative thermal diffusivity) within uncertainty for all cases analyzed. Ion-scale TGLF agrees in only some cases. Two criteria based on the ratios of normalized linear growth rates are able to distinguish cases in which ion-scale simulations are sufficient from cases for which multi-scale simulations are necessary. The form of these criteria reveal the key role of zonal flow mixing in moderating multi-scale effects. |
| doi_str_mv | 10.1088/1361-6587/ab24ae |
| format | Article |
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| ispartof | Plasma physics and controlled fusion, 2019-08, Vol.61 (8), p.85022 |
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| language | eng |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | multi-scale perturbative diffusivity Physics temperature fluctuations turbulence validation |
| title | Criteria for the importance of multi-scale interactions in turbulent transport simulations |
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