Linear simulation of magnetohydrodynamic plasma response to three-dimensional magnetic perturbations in high-βP plasmas
Abstract
In this work, we report the numerical analyses of linear magnetohydrodynamics (MHD) plasma response to applied three-dimensional magnetic perturbations (MPs) in a joint DIII-D/EAST collaboration on high-βP (poloidal beta) plasmas, utilizing the extended-MHD code M3D-C1, with the purpose of realizing a better understanding of the existing experiment in which the n=3 MPs were applied to such high-βP plasmas attempting to control large amplitude type-I ELMs. Such high-βP plasmas obtained at the DIII-D tokamak feature an upper-biased double null configuration, a high edge safety factor q95~6.4, and a stable internal transport barrier (ITB) leading to relatively high core pressures. Single-fluid simulations show that the plasma response to n=3 MPs, including both non-resonant/kinking and resonant components, is significantly weaker than that to n=1 or 2 MPs. To survey the impact of q95 on plasma response to applied MPs, the SEGWAY (Self-consistent Equilibrium Generating Workflow for AnalYsis) module, developed in the OMFIT integrated modelling framework, is employed to generate a series of equilibria with a wide range of q95 while other key parameters including the normalized beta, electron density at pedestal top, and plasma shape are kept fixed. Compared to the vacuum response, single-fluid M3D-C1 simulations predict a much more significant decrease ofmore »
- Authors:
-
[2];
[2];
[3];
[2];
[1]
- Chinese Academy of Sciences (CAS), Hefei (China)
- General Atomics, San Diego, CA (United States)
- Chinese Academy of Sciences (CAS), Hefei (China); Oak Ridge Associated Univ., Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1836558
- Grant/Contract Number:
- FC02-04ER54698; FG02-95ER54309; 2017YFE0300400; 11675220; 11775264
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 62; Journal Issue: 3; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Resonant magnetic perturbation; M3D-C1; Edge-localized modes; Internal transport barrier
Citation Formats
Chen, Ran, Lyons, Brendan C., Weisberg, David B., Lao, L. L., Ding, Siye, Sun, Y., Garofalo, Andrea M., Gong, Xianzu, and Xu, Guo Sheng. Linear simulation of magnetohydrodynamic plasma response to three-dimensional magnetic perturbations in high-βP plasmas. United States: N. p., 2022.
Web. doi:10.1088/1741-4326/ac39f4.
Chen, Ran, Lyons, Brendan C., Weisberg, David B., Lao, L. L., Ding, Siye, Sun, Y., Garofalo, Andrea M., Gong, Xianzu, & Xu, Guo Sheng. Linear simulation of magnetohydrodynamic plasma response to three-dimensional magnetic perturbations in high-βP plasmas. United States. https://doi.org/10.1088/1741-4326/ac39f4
Chen, Ran, Lyons, Brendan C., Weisberg, David B., Lao, L. L., Ding, Siye, Sun, Y., Garofalo, Andrea M., Gong, Xianzu, and Xu, Guo Sheng. Fri .
"Linear simulation of magnetohydrodynamic plasma response to three-dimensional magnetic perturbations in high-βP plasmas". United States. https://doi.org/10.1088/1741-4326/ac39f4. https://www.osti.gov/servlets/purl/1836558.
@article{osti_1836558,
title = {Linear simulation of magnetohydrodynamic plasma response to three-dimensional magnetic perturbations in high-βP plasmas},
author = {Chen, Ran and Lyons, Brendan C. and Weisberg, David B. and Lao, L. L. and Ding, Siye and Sun, Y. and Garofalo, Andrea M. and Gong, Xianzu and Xu, Guo Sheng},
abstractNote = {In this work, we report the numerical analyses of linear magnetohydrodynamics (MHD) plasma response to applied three-dimensional magnetic perturbations (MPs) in a joint DIII-D/EAST collaboration on high-βP (poloidal beta) plasmas, utilizing the extended-MHD code M3D-C1, with the purpose of realizing a better understanding of the existing experiment in which the n=3 MPs were applied to such high-βP plasmas attempting to control large amplitude type-I ELMs. Such high-βP plasmas obtained at the DIII-D tokamak feature an upper-biased double null configuration, a high edge safety factor q95~6.4, and a stable internal transport barrier (ITB) leading to relatively high core pressures. Single-fluid simulations show that the plasma response to n=3 MPs, including both non-resonant/kinking and resonant components, is significantly weaker than that to n=1 or 2 MPs. To survey the impact of q95 on plasma response to applied MPs, the SEGWAY (Self-consistent Equilibrium Generating Workflow for AnalYsis) module, developed in the OMFIT integrated modelling framework, is employed to generate a series of equilibria with a wide range of q95 while other key parameters including the normalized beta, electron density at pedestal top, and plasma shape are kept fixed. Compared to the vacuum response, single-fluid M3D-C1 simulations predict a much more significant decrease of resonant plasma response to the applied n=3 MPs at the maximum penetration radii as q95 increases. In contrast to single-fluid simulation results showing resonant penetration occurs only near the pedestal top where the E×B toroidal rotation frequency is zero, two-fluid simulations show two comparable resonant penetrations locating near the pedestal top and the ITB foot, where the perpendicular electron rotation frequency is zero. Such resonant field penetration near the ITB foot may be responsible for the observed formation of a staircase structure in both electron density and temperature profiles and thereby a considerable deterioration of global plasma performance when MPs are applied in high-βP plasmas. Motivated by this numerical work, we provide some ideas for the future research, with the purpose of realizing effective ELM control in such high-βP plasmas on the DIII-D and EAST devices.},
doi = {10.1088/1741-4326/ac39f4},
journal = {Nuclear Fusion},
number = 3,
volume = 62,
place = {United States},
year = {Fri Mar 25 00:00:00 EDT 2022},
month = {Fri Mar 25 00:00:00 EDT 2022}
}
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