| NUCLEAR PHYSICS |
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Stabilization of Short Wavelength Resistive Ballooning Modes by Ion-to-Electron Temperature and Gradient Ratios in Tokamak Edge Plasmas |
| Jian-Qiang Xu**, Xiao-Dong Peng , Hong-Peng Qu , Guang-Zhou Hao |
| Southwestern Institute of Physics, Chengdu 610041, China |
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| Cite this article: |
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Jian-Qiang Xu, Xiao-Dong Peng , Hong-Peng Qu et al 2020 Chin. Phys. Lett. 37 062801 |
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Abstract We numerically investigate the effects of ion-to-electron temperature ratio $T_{\rm i}/T_{\rm e}$ and temperature gradient ratio $\eta_{\rm i}/\eta_{\rm e}$ on resistive ballooning modes (RBMs) under tokamak edge plasma conditions. The results show that the growth rates of the RBMs exhibit the characteristic of a quite broad poloidal wavenumber spectrum in the cold ion limit. The growth rate spectrum becomes narrower and the peak of the spectrum shifts from the short to long wavelength side with increasing $T_{\rm i}/T_{\rm e}$ and $\eta_{\rm i}/\eta_{\rm e}$. The electron temperature gradient has a very weak effect on the stability of RBMs. However, the ion-to-electron temperature ratio and the temperature gradient ratio have strong stabilizing effects on short-wavelength RBMs, while they have relatively weak effects on long-wavelength RBMs.
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Received: 11 December 2019
Published: 26 May 2020
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| PACS: |
28.52.Av
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(Theory, design, and computerized simulation)
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52.30.Cv
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(Magnetohydrodynamics (including electron magnetohydrodynamics))
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52.30.Ex
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(Two-fluid and multi-fluid plasmas)
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| Fund: *Supported by the National Key R&D Program of China (Grant Nos. 2017YFE0300405 and 2017YFE0301200) and the National Natural Science Foundation of China (Grant Nos. 11775067, 11775069, 11875019, and 11805058). |
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