Non-ideal MHD growth of current interchange tearing modes at plasma edge and response to externally-imposed flow
| Autor: | Hideaki Miura, Linjin Zheng, Wendell Horton |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Hideaki Miura, Linjin Zheng, Wendell Horton; Non-ideal MHD growth of current interchange tearing modes at plasma edge and response to externally-imposed flow. Physics of Plasmas 1 May 2023; 30 (5): 052503. https://doi.org/10.1063/5.0106785 |
| ISSN: | 1089-7674 1070-664X |
| Popis: | Current interchange tearing modes (CITMs) have been proposed to explain an intermittent eruption of electric current toward a divertor at an edge region of a tokamak device. Extended magnetohydrodynamic (MHD) simulations combined with the Scrape-Off-Layer diffusion model, which has been developed by the authors [Miura et al., Phys. Plasmas 24, 092111 (2017)], are carried out in order to study the growth of a CITM under influences of two-fluid and gyro-viscous effects, or non-ideal MHD effects. Numerical simulations both with and without an externally imposed azimuthal flow show that the growth of a CITM is observed for a relatively small flow velocity, and that a CITM can be a candidate mechanism for the intermittent eruption of the current in a tokamak, whether the growth is under influences of non-ideal MHD effects or not. The growth can be suppressed when an externally imposed azimuthal flow is sufficiently large to cause a finite radial displacement because such a displacement prevents a transition from an interchange to a tearing mode that is the key process of a CITM. Furthermore, it is also found that a stripe pattern similar to so-called streamers is formed in the course of the CITM growth. The basic nature of this streamer-like structure is also presented. |
| Databáze: | OpenAIRE |
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