Thermal transport dynamics in the quasi-single helicity state
| Autor: | I. J. McKinney, Paul Terry |
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| Rok vydání: | 2017 |
| Předmět: | |
| Zdroj: | Physics of Plasmas. 24:062303 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | A dynamical model describing oscillations between multiple and single helicity configurations in the quasi-single helicity (QSH) state of the reversed field pinch [P. W. Terry and G. G. Whelan, Plasma Phys. Controlled Fusion 56, 094003 (2014)] is extended to include electron temperature profile dynamics. It is shown that QSH dynamics is linked to the electron temperature profile because the suppression of mode coupling between tearing modes proposed to underlie QSH also suppresses magnetic-fluctuation-induced thermal transport. Above the threshold of dominant-mode shear that marks the transition to QSH, the model produces temperature-gradient steepening in the strong shear region. Oscillations of the dominant and secondary mode amplitudes give rise to oscillations of the temperature gradient. The phasing and amplitude of temperature gradient oscillations relative to those of the dominant mode are in agreement with experiment. This provides further evidence that the model, while heuristic, captures key phy... |
| Databáze: | OpenAIRE |
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