Enhancement of ECCD by the current condensation effect for stabilizing large magnetic islands caused by neoclassical tearing modes in tokamak plasmas
Abstract
The radio frequency current condensation effect reported in Reiman and Fisch (2018 Phys. Rev. Lett.121 225001) is modeled in the nonlinear resistive magnetohydrodynamic code. A series of numerical investigations have been performed to investigate the enhancement of electron cyclotron current drive (ECCD) by the current condensation effect during the control of neoclassical tearing mode (NTM) in tokamak plasmas. In the numerical model, both the parallel transport and the perpendicular transport of electron temperature are considered. The EC driven current and driven perturbed electron temperature can nonlinearly evolve within the given magnetic configuration and eventually reach saturation states. The input power threshold of ECCD and the fold bifurcation phenomenon are numerically verified via nonlinear simulations. The numerical results show good agreements with the analytical results. Moreover, spatial distributions of EC current for the two solutions at different condensed level are displayed. The control effectiveness of ECCD for large NTM islands has been evaluated while considering the current condensation effect. While taking into account current condensation effect, for a sufficiently large input power, a larger island can be more effectively stabilized than a smaller one, which suggests a reassessment of the previous idea that the ECCD should always be turned on asmore »
- Authors:
-
[1];
[1];
[2];
[3]
- Dalian Univ. of Technology (China)
- National Inst. of Natural Sciences (NINS), Toki (Japan)
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE; National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 2310912
- Grant/Contract Number:
- AC02-09CH11466; 11925501; 12105034
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 64; 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; current condensation effect; neoclassical tearing mode; electron cyclotron current drive
Citation Formats
Liu, Tong, Wang, Zheng-Xiong, Wei, Lai, Wang, Jialei, and Reiman, Allan. Enhancement of ECCD by the current condensation effect for stabilizing large magnetic islands caused by neoclassical tearing modes in tokamak plasmas. United States: N. p., 2024.
Web. doi:10.1088/1741-4326/ad1c94.
Liu, Tong, Wang, Zheng-Xiong, Wei, Lai, Wang, Jialei, & Reiman, Allan. Enhancement of ECCD by the current condensation effect for stabilizing large magnetic islands caused by neoclassical tearing modes in tokamak plasmas. United States. https://doi.org/10.1088/1741-4326/ad1c94
Liu, Tong, Wang, Zheng-Xiong, Wei, Lai, Wang, Jialei, and Reiman, Allan. Fri .
"Enhancement of ECCD by the current condensation effect for stabilizing large magnetic islands caused by neoclassical tearing modes in tokamak plasmas". United States. https://doi.org/10.1088/1741-4326/ad1c94. https://www.osti.gov/servlets/purl/2310912.
@article{osti_2310912,
title = {Enhancement of ECCD by the current condensation effect for stabilizing large magnetic islands caused by neoclassical tearing modes in tokamak plasmas},
author = {Liu, Tong and Wang, Zheng-Xiong and Wei, Lai and Wang, Jialei and Reiman, Allan},
abstractNote = {The radio frequency current condensation effect reported in Reiman and Fisch (2018 Phys. Rev. Lett.121 225001) is modeled in the nonlinear resistive magnetohydrodynamic code. A series of numerical investigations have been performed to investigate the enhancement of electron cyclotron current drive (ECCD) by the current condensation effect during the control of neoclassical tearing mode (NTM) in tokamak plasmas. In the numerical model, both the parallel transport and the perpendicular transport of electron temperature are considered. The EC driven current and driven perturbed electron temperature can nonlinearly evolve within the given magnetic configuration and eventually reach saturation states. The input power threshold of ECCD and the fold bifurcation phenomenon are numerically verified via nonlinear simulations. The numerical results show good agreements with the analytical results. Moreover, spatial distributions of EC current for the two solutions at different condensed level are displayed. The control effectiveness of ECCD for large NTM islands has been evaluated while considering the current condensation effect. While taking into account current condensation effect, for a sufficiently large input power, a larger island can be more effectively stabilized than a smaller one, which suggests a reassessment of the previous idea that the ECCD should always be turned on as early as possible. The potential physics mechanism behind the ECCD control have all been discussed in detail. Furthermore, the condensation effect is found to have favorable effects on the radial misalignment of ECCD. In the consideration of the situation for extremely localized control needs, a highly peaked heating profile is adopted to verify that the fold bifurcation phenomenon still exists and the current condensation effect can still take effect in this extreme condition.},
doi = {10.1088/1741-4326/ad1c94},
journal = {Nuclear Fusion},
number = 3,
volume = 64,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2024},
month = {Fri Jan 19 00:00:00 EST 2024}
}
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