A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma
We extend the bounce-averaged kinetic (BK) electron model to be applicable in general tokamak magnetic geometries and implement it on the global δf particle-in-cell gyrokinetic code gKPSP. We perform a benchmark study of the updated BK model against the gyrokinetic electron model in flux-tube codes,...
| Main Authors: | , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Online Access: | https://hdl.handle.net/10356/178510 |
| _version_ | 1826115686228819968 |
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| author | Yi, Sumin Sung, C. Yoon, Eisung Kwon, Jae-Min Hahm, T. S. Kim, Daewoong Kang, Jisung Seo, Janghoon Cho, Y. W. Qi, Lei |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Yi, Sumin Sung, C. Yoon, Eisung Kwon, Jae-Min Hahm, T. S. Kim, Daewoong Kang, Jisung Seo, Janghoon Cho, Y. W. Qi, Lei |
| author_sort | Yi, Sumin |
| collection | NTU |
| description | We extend the bounce-averaged kinetic (BK) electron model to be applicable in general tokamak magnetic geometries and implement it on the global δf particle-in-cell gyrokinetic code gKPSP. We perform a benchmark study of the updated BK model against the gyrokinetic electron model in flux-tube codes, CGYRO and GENE. From the comparisons among the simulations based on the local parameters of a KSTAR L-mode plasma, we confirm a reasonable agreement among the linear results from the different codes. In the nonlinear gKPSP simulation with a narrow plasma gradient region whose width comparable to the mode correlation length, ion and electron heat fluxes are compatible with those calculated by CGYRO. However, with an unstable region sufficiently wider than the mode correlation length, gKPSP predicts 2-3 times larger turbulent heat fluxes. Taking into account the differences between the flux-tube and global simulations, the overall agreement is encouraging for further validation and development of the BK electron model. In global simulations using a wide range of the experimental plasma profiles, we find an intricate coupling of turbulence spreading and a zonal flow in determining the radial profiles of turbulent heat fluxes, which has not been reported to date. |
| first_indexed | 2024-10-01T03:59:12Z |
| format | Journal Article |
| id | ntu-10356/178510 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:59:12Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1785102024-07-01T15:34:37Z A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma Yi, Sumin Sung, C. Yoon, Eisung Kwon, Jae-Min Hahm, T. S. Kim, Daewoong Kang, Jisung Seo, Janghoon Cho, Y. W. Qi, Lei School of Physical and Mathematical Sciences Physics Kinetic electrons Electron models We extend the bounce-averaged kinetic (BK) electron model to be applicable in general tokamak magnetic geometries and implement it on the global δf particle-in-cell gyrokinetic code gKPSP. We perform a benchmark study of the updated BK model against the gyrokinetic electron model in flux-tube codes, CGYRO and GENE. From the comparisons among the simulations based on the local parameters of a KSTAR L-mode plasma, we confirm a reasonable agreement among the linear results from the different codes. In the nonlinear gKPSP simulation with a narrow plasma gradient region whose width comparable to the mode correlation length, ion and electron heat fluxes are compatible with those calculated by CGYRO. However, with an unstable region sufficiently wider than the mode correlation length, gKPSP predicts 2-3 times larger turbulent heat fluxes. Taking into account the differences between the flux-tube and global simulations, the overall agreement is encouraging for further validation and development of the BK electron model. In global simulations using a wide range of the experimental plasma profiles, we find an intricate coupling of turbulence spreading and a zonal flow in determining the radial profiles of turbulent heat fluxes, which has not been reported to date. Published version This work is supported by the R&D Program through the Korea Institute of Fusion Energy (KFE) funded by the Ministry of Science and ICT of the Republic of Korea (Nos. KFE-EN2401 and KFE-EN2441) and by the R&D Program of the Development of Key Technology and Management of ITER Project (No. 2023-IN2304-9). E. S. Yoon’s work is benefited from the support of the Korea Institute of Energy Technology Evaluation and Planning and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (Grant No. 20214000000410). 2024-06-25T01:28:41Z 2024-06-25T01:28:41Z 2024 Journal Article Yi, S., Sung, C., Yoon, E., Kwon, J., Hahm, T. S., Kim, D., Kang, J., Seo, J., Cho, Y. W. & Qi, L. (2024). A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma. Physics of Plasmas, 31(2), 022307-. https://dx.doi.org/10.1063/5.0178350 1070-664X https://hdl.handle.net/10356/178510 10.1063/5.0178350 2-s2.0-85186668760 2 31 022307 en Physics of Plasmas © 2024 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International (CC BY-NC-ND) license (http://creativecommons.org/licenses/by-nc-nd/4.0/). application/pdf |
| spellingShingle | Physics Kinetic electrons Electron models Yi, Sumin Sung, C. Yoon, Eisung Kwon, Jae-Min Hahm, T. S. Kim, Daewoong Kang, Jisung Seo, Janghoon Cho, Y. W. Qi, Lei A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma |
| title | A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma |
| title_full | A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma |
| title_fullStr | A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma |
| title_full_unstemmed | A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma |
| title_short | A validation study of a bounce-averaged kinetic electron model in a KSTAR L-mode plasma |
| title_sort | validation study of a bounce averaged kinetic electron model in a kstar l mode plasma |
| topic | Physics Kinetic electrons Electron models |
| url | https://hdl.handle.net/10356/178510 |
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