| PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES |
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Comparison of ITG and TEM Microturbulence in DIII–D Tokamak |
| Wei Hu1,2,3, Hong-Ying Feng4,2,1,3, Wen-Lu Zhang2,5,3,1** |
1Department of Modern Physics, University of Science and Technology of China, Hefei 230026
2Beijing National Laboratory for Condensed Matter Physics and CAS Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190
3University of Chinese Academy of Sciences, Beijing 100049
4College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002
5Songshan Lake Materials Laboratory, Dongguan 523808
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| Cite this article: |
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Wei Hu, Hong-Ying Feng, Wen-Lu Zhang 2019 Chin. Phys. Lett. 36 085201 |
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Abstract Microturbulence excited by ion temperature gradient (ITG)-dominant and trapped electron mode (TEM)-dominant instabilities is compared in the fusion plasmas using gyrokinetic simulations based on the realistic equilibrium data from DIII–D discharges. Collisions make a difference between two plasmas and give rise to similar results to those found in previous research experiments [Chin. Phys. Lett. 35 (2018) 105201]. The mode structures and frequency spectrum of the most unstable modes characterized by the ITG-dominant and TEM-dominant instabilities are excited in the lower and higher $T_{\rm e}$ plasmas in the linear simulations. In the nonlinear simulations, contour plots of the perturbed potential are shown in the saturated stage, with the radial correlation lengths being microscopic on the order of the ion thermal gyroradius $\rho_{\rm i}$ in both the ITG and the TEM microturbulences. The dominant mode wavelengths of the perturbed potential increase when evolving from linear to nonlinear stages in both simulations, with the fluctuation energy spreading from the linearly dominant modes to the nonlinearly dominant modes. The radial correlation lengths are about 4$\rho_{\rm i}$ and the electron density fluctuation intensities are about 0.85% in the nonlinear saturated stage, which are in agreement with the experimental results.
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Received: 05 April 2019
Published: 22 July 2019
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| Fund: Supported by the National MCF Energy R&D Program under Grant Nos 2018YFE0304100, 2017YFE0301300 and 2018YFE0311300, the National Natural Science Foundation of China under Grant Nos 11675257, 11675256, 11875067, 11835016 and 11705275, the Strategic Priority Research Program of the Chinese Academy of Sciences under Grant No XDB16010300, the Key Research Program of Frontier Science of the Chinese Academy of Sciences under Grant No QYZDJ-SSW-SYS016, and the External Cooperation Program of the Chinese Academy of Sciences under Grant No 112111KYSB20160039. |
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