Drift-Alfvén wave turbulence induced particle and heat transport in I-mode pedestal plasmas
In this work, most of the weakly coherent mode (WCM) characteristics and the level of transport coefficients observed in I-mode pedestal plasmas of C-Mod are reproduced theoretically. The dispersion relation of drift-Alfvén wave (DAW) is analytically solved for both drift-wave (DW) and Alfvén wave b...
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IOP Publishing
2025-01-01
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| Series: | Nuclear Fusion |
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| Online Access: | https://doi.org/10.1088/1741-4326/ada811 |
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| author | Junang Zhang Lu Wang Weixin Guo |
| author_facet | Junang Zhang Lu Wang Weixin Guo |
| author_sort | Junang Zhang |
| collection | DOAJ |
| description | In this work, most of the weakly coherent mode (WCM) characteristics and the level of transport coefficients observed in I-mode pedestal plasmas of C-Mod are reproduced theoretically. The dispersion relation of drift-Alfvén wave (DAW) is analytically solved for both drift-wave (DW) and Alfvén wave branches, and the WCM is identified to be the DW branch. The frequency of DW branch in the laboratory frame is about 200 kHz, the poloidal phase velocity propagating in the direction of electron diamagnetic drift is around $7.0\,{\text{km}} \cdot {{\text{s}}^{ - 1}}$ , and the relative magnitude of normalized fluctuations of electron temperature, density and magnetic field are $| {\frac{{{{\tilde T}_e}}}{{{T_{e0}}}}} |/| {\frac{{{{\tilde n}_e}}}{{{n_0}}}} | \approx 0.1$ and $| {{\tilde{\mathbf b}}} |/| {\frac{{{{\tilde n}_e}}}{{{n_0}}}}| \approx 8.3 \times {10^{ - 4}}$ , respectively, which are all consistent with the characteristics of WCM observed in C-Mod experiment. Moreover, the modulation-induced transport coefficients in the presence of DAW turbulence are calculated. It is found that the electromagnetic part of transport coefficient is about 10% of the electrostatic part. The particle diffusivity is $0.21\,{{\text{m}}^2} \cdot {{\text{s}}^{ - 1}}$ , which is about twice of the experimental value. Meanwhile, the electron thermal conductivity is $0.27\,{{\text{m}}^2} \cdot {{\text{s}}^{ - 1}}$ , and is in very good agreement with the corresponding experimental and simulation values. These results may advance the understanding of the underlying physics of turbulence and transport in the I-mode pedestal plasmas. |
| format | Article |
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| institution | Kabale University |
| issn | 0029-5515 |
| language | English |
| publishDate | 2025-01-01 |
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| series | Nuclear Fusion |
| spelling | doaj-art-eb4d54bf389648ed932437353e78bd482025-01-31T10:46:57ZengIOP PublishingNuclear Fusion0029-55152025-01-0165202606810.1088/1741-4326/ada811Drift-Alfvén wave turbulence induced particle and heat transport in I-mode pedestal plasmasJunang Zhang0Lu Wang1https://orcid.org/0000-0002-5881-6139Weixin Guo2https://orcid.org/0000-0001-7677-799XState Key Laboratory of Advanced Electromagnetic Technology , International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Advanced Electromagnetic Technology , International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaState Key Laboratory of Advanced Electromagnetic Technology , International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, ChinaIn this work, most of the weakly coherent mode (WCM) characteristics and the level of transport coefficients observed in I-mode pedestal plasmas of C-Mod are reproduced theoretically. The dispersion relation of drift-Alfvén wave (DAW) is analytically solved for both drift-wave (DW) and Alfvén wave branches, and the WCM is identified to be the DW branch. The frequency of DW branch in the laboratory frame is about 200 kHz, the poloidal phase velocity propagating in the direction of electron diamagnetic drift is around $7.0\,{\text{km}} \cdot {{\text{s}}^{ - 1}}$ , and the relative magnitude of normalized fluctuations of electron temperature, density and magnetic field are $| {\frac{{{{\tilde T}_e}}}{{{T_{e0}}}}} |/| {\frac{{{{\tilde n}_e}}}{{{n_0}}}} | \approx 0.1$ and $| {{\tilde{\mathbf b}}} |/| {\frac{{{{\tilde n}_e}}}{{{n_0}}}}| \approx 8.3 \times {10^{ - 4}}$ , respectively, which are all consistent with the characteristics of WCM observed in C-Mod experiment. Moreover, the modulation-induced transport coefficients in the presence of DAW turbulence are calculated. It is found that the electromagnetic part of transport coefficient is about 10% of the electrostatic part. The particle diffusivity is $0.21\,{{\text{m}}^2} \cdot {{\text{s}}^{ - 1}}$ , which is about twice of the experimental value. Meanwhile, the electron thermal conductivity is $0.27\,{{\text{m}}^2} \cdot {{\text{s}}^{ - 1}}$ , and is in very good agreement with the corresponding experimental and simulation values. These results may advance the understanding of the underlying physics of turbulence and transport in the I-mode pedestal plasmas.https://doi.org/10.1088/1741-4326/ada811I-mode pedestal plasmasDAW turbulencemodulation-induced transportparticle and heat transport |
| spellingShingle | Junang Zhang Lu Wang Weixin Guo Drift-Alfvén wave turbulence induced particle and heat transport in I-mode pedestal plasmas Nuclear Fusion I-mode pedestal plasmas DAW turbulence modulation-induced transport particle and heat transport |
| title | Drift-Alfvén wave turbulence induced particle and heat transport in I-mode pedestal plasmas |
| title_full | Drift-Alfvén wave turbulence induced particle and heat transport in I-mode pedestal plasmas |
| title_fullStr | Drift-Alfvén wave turbulence induced particle and heat transport in I-mode pedestal plasmas |
| title_full_unstemmed | Drift-Alfvén wave turbulence induced particle and heat transport in I-mode pedestal plasmas |
| title_short | Drift-Alfvén wave turbulence induced particle and heat transport in I-mode pedestal plasmas |
| title_sort | drift alfven wave turbulence induced particle and heat transport in i mode pedestal plasmas |
| topic | I-mode pedestal plasmas DAW turbulence modulation-induced transport particle and heat transport |
| url | https://doi.org/10.1088/1741-4326/ada811 |
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