Quantifying the role of higher order neoclassical corrections to gyrokinetics in tokamak plasmas

A. V. Dudkovskaia; J. W. Connor; D. Dickinson; H. R. Wilson

doi:10.1088/1361-6587/acc688

Quantifying the role of higher order neoclassical corrections to gyrokinetics in tokamak plasmas

A. V. Dudkovskaia, J. W. Connor, D. Dickinson, H. R. Wilson

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We implement the higher order gyrokinetic theory developed in Dudkovskaia et al (2023 Plasma Phys. Control. Fusion 65 045010), reduced to the limit of B _ϑ / B ₀ ≪ 1 , where B ₀ is the tokamak equilibrium magnetic field, and B _ϑ is its poloidal component, in the local gyrokinetic turbulence code, GS2. The principal motivation for this extension is to quantify the importance of neoclassical flows in electromagnetic gyrokinetics, with a particular interest in sharp pressure gradient regions where the bootstrap current becomes dominant. To incorporate neoclassical equilibrium physics, GS2 is coupled to NEO, a multi-species drift kinetic solver. It is found that the regions where microinstabilities are most likely to be influenced by neoclassical equilibrium effects are in a pedestal plasma and a spherical tokamak core plasma.

Original language	English
Article number	054006
Journal	Plasma Physics and Controlled Fusion
Volume	65
Issue number	5
DOIs	https://doi.org/10.1088/1361-6587/acc688
State	Published - May 2023
Externally published	Yes

Funding

This work has been carried out within the framework of the EUROfusion Consortium, funded by the European Union via the Euratom Research and Training Programme (Grant Agreement No. 101052200—EUROfusion). Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Commission. Neither the European Union nor the European Commission can be held responsible for them. We would like to thank the reviewers for their helpful comments and suggestions. We are grateful to Jeff Candy for making the NEO drift kinetic code available and for helpful discussions. We would also like to thank Felix Parra for helpful discussions. This work was supported by the UK Engineering and Physical Sciences Research Council (EPSRC) Programme Grant ‘Multiscale Turbulent Dynamics of Tokamak Plasmas’, Grant No. EP/R034737/1.

Funders	Funder number
Engineering and Physical Sciences Research Council	EP/R034737/1
European Commission	101052200—EUROfusion

Keywords

bootstrap current
higher-order gyrokinetic theory
neoclassical flows
tokamak pedestal
tokamak plasma

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/1361-6587/acc688

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title = "Quantifying the role of higher order neoclassical corrections to gyrokinetics in tokamak plasmas",

abstract = "We implement the higher order gyrokinetic theory developed in Dudkovskaia et al (2023 Plasma Phys. Control. Fusion 65 045010), reduced to the limit of B ϑ / B 0 ≪ 1 , where B 0 is the tokamak equilibrium magnetic field, and B ϑ is its poloidal component, in the local gyrokinetic turbulence code, GS2. The principal motivation for this extension is to quantify the importance of neoclassical flows in electromagnetic gyrokinetics, with a particular interest in sharp pressure gradient regions where the bootstrap current becomes dominant. To incorporate neoclassical equilibrium physics, GS2 is coupled to NEO, a multi-species drift kinetic solver. It is found that the regions where microinstabilities are most likely to be influenced by neoclassical equilibrium effects are in a pedestal plasma and a spherical tokamak core plasma.",

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AU - Dickinson, D.

AU - Wilson, H. R.

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N2 - We implement the higher order gyrokinetic theory developed in Dudkovskaia et al (2023 Plasma Phys. Control. Fusion 65 045010), reduced to the limit of B ϑ / B 0 ≪ 1 , where B 0 is the tokamak equilibrium magnetic field, and B ϑ is its poloidal component, in the local gyrokinetic turbulence code, GS2. The principal motivation for this extension is to quantify the importance of neoclassical flows in electromagnetic gyrokinetics, with a particular interest in sharp pressure gradient regions where the bootstrap current becomes dominant. To incorporate neoclassical equilibrium physics, GS2 is coupled to NEO, a multi-species drift kinetic solver. It is found that the regions where microinstabilities are most likely to be influenced by neoclassical equilibrium effects are in a pedestal plasma and a spherical tokamak core plasma.

AB - We implement the higher order gyrokinetic theory developed in Dudkovskaia et al (2023 Plasma Phys. Control. Fusion 65 045010), reduced to the limit of B ϑ / B 0 ≪ 1 , where B 0 is the tokamak equilibrium magnetic field, and B ϑ is its poloidal component, in the local gyrokinetic turbulence code, GS2. The principal motivation for this extension is to quantify the importance of neoclassical flows in electromagnetic gyrokinetics, with a particular interest in sharp pressure gradient regions where the bootstrap current becomes dominant. To incorporate neoclassical equilibrium physics, GS2 is coupled to NEO, a multi-species drift kinetic solver. It is found that the regions where microinstabilities are most likely to be influenced by neoclassical equilibrium effects are in a pedestal plasma and a spherical tokamak core plasma.

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Quantifying the role of higher order neoclassical corrections to gyrokinetics in tokamak plasmas

Abstract

Funding

Keywords

UN SDGs

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