A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1

S. Ku; C. S. Chang; R. Hager; R. M. Churchill; G. R. Tynan; I. Cziegler; M. Greenwald; J. Hughes; S. E. Parker; M. F. Adams; E. D'Azevedo; P. Worley

doi:10.1063/1.5020792

A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1

S. Ku, C. S. Chang, R. Hager, R. M. Churchill, G. R. Tynan, I. Cziegler, M. Greenwald, J. Hughes, S. E. Parker, M. F. Adams, E. D'Azevedo, P. Worley

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100 Scopus citations

Abstract

A fast edge turbulence suppression event has been simulated in the electrostatic version of the gyrokinetic particle-in-cell code XGC1 in a realistic diverted tokamak edge geometry under neutral particle recycling. The results show that the sequence of turbulent Reynolds stress followed by neoclassical ion orbit-loss driven together conspire to form the sustaining radial electric field shear and to quench turbulent transport just inside the last closed magnetic flux surface. The main suppression action is located in a thin radial layer around ψ0.96-0.98, where ψ_N is the normalized poloidal flux, with the time scale ∼0.1 ms.

Original language	English (US)
Article number	056107
Journal	Physics of Plasmas
Volume	25
Issue number	5
DOIs	https://doi.org/10.1063/1.5020792
State	Published - May 1 2018

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.5020792

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title = "A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1",

abstract = "A fast edge turbulence suppression event has been simulated in the electrostatic version of the gyrokinetic particle-in-cell code XGC1 in a realistic diverted tokamak edge geometry under neutral particle recycling. The results show that the sequence of turbulent Reynolds stress followed by neoclassical ion orbit-loss driven together conspire to form the sustaining radial electric field shear and to quench turbulent transport just inside the last closed magnetic flux surface. The main suppression action is located in a thin radial layer around ψ0.96-0.98, where ψN is the normalized poloidal flux, with the time scale ∼0.1 ms.",

author = "S. Ku and Chang, \{C. S.\} and R. Hager and Churchill, \{R. M.\} and Tynan, \{G. R.\} and I. Cziegler and M. Greenwald and J. Hughes and Parker, \{S. E.\} and Adams, \{M. F.\} and E. D'Azevedo and P. Worley",

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month = may,

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doi = "10.1063/1.5020792",

language = "English (US)",

volume = "25",

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TY - JOUR

T1 - A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1

AU - Ku, S.

AU - Chang, C. S.

AU - Hager, R.

AU - Churchill, R. M.

AU - Tynan, G. R.

AU - Cziegler, I.

AU - Greenwald, M.

AU - Hughes, J.

AU - Parker, S. E.

AU - Adams, M. F.

AU - D'Azevedo, E.

AU - Worley, P.

PY - 2018/5/1

Y1 - 2018/5/1

N2 - A fast edge turbulence suppression event has been simulated in the electrostatic version of the gyrokinetic particle-in-cell code XGC1 in a realistic diverted tokamak edge geometry under neutral particle recycling. The results show that the sequence of turbulent Reynolds stress followed by neoclassical ion orbit-loss driven together conspire to form the sustaining radial electric field shear and to quench turbulent transport just inside the last closed magnetic flux surface. The main suppression action is located in a thin radial layer around ψ0.96-0.98, where ψN is the normalized poloidal flux, with the time scale ∼0.1 ms.

AB - A fast edge turbulence suppression event has been simulated in the electrostatic version of the gyrokinetic particle-in-cell code XGC1 in a realistic diverted tokamak edge geometry under neutral particle recycling. The results show that the sequence of turbulent Reynolds stress followed by neoclassical ion orbit-loss driven together conspire to form the sustaining radial electric field shear and to quench turbulent transport just inside the last closed magnetic flux surface. The main suppression action is located in a thin radial layer around ψ0.96-0.98, where ψN is the normalized poloidal flux, with the time scale ∼0.1 ms.

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U2 - 10.1063/1.5020792

DO - 10.1063/1.5020792

M3 - Article

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SN - 1070-664X

VL - 25

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 5

M1 - 056107

ER -

A fast low-to-high confinement mode bifurcation dynamics in the boundary-plasma gyrokinetic code XGC1

Abstract

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