Gyrokinetic study of the electron temperature gradient instability in plasmas with slightly hollow density profiles
Jiaqi Dong,H. Sanuki,K. Itoh +2 more
TLDR
The electron temperature gradient driven instabilities in plasmas with slightly hollow density profiles are studied in this article, where the gyrokinetic integral eigenvalue equation valid for a sheared slab configuration is employed.Abstract:
The electron temperature gradient driven instabilities in plasmas with slightly hollow density profiles are studied. The gyrokinetic integral eigenvalue equation valid for a sheared slab configuration is employed. The Debye shielding effect on the modes is investigated. The effects of a sheared E×B flow on the modes are considered. Six modes with even or odd parities are found to be simultaneously unstable. The mixing length estimate for the transport is calculated. The flow shear suppression on the modes, as well as on the transport, is demonstrated. The correlations of the results with helical system Heliotron/Torsotron and tokamak experiments are discussed.read more
Citations
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Electron-temperature-gradient-driven turbulence
TL;DR: In this article, collisionless electron-temperature-gradient-driven (ETG) turbulence in toroidal geometry is studied via nonlinear numerical simulations and two massively parallel, fully gyrokinetic Vlasov codes are used, both including electromagnetic effects.
Journal Article
Solitary Radial Electric Field Structure in Tokamak Plasmas
TL;DR: In this paper, the solitary structure solution of the radial electric field Er in the tokamak plasmas is obtained, and it is shown to be stable under an external power supply, like a biased electrode at the edge.
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Electron temperature gradient instability in toroidal plasmas
TL;DR: In this paper, the scaling of the critical gradient with respect to toroidicity and to the ratio of electron temperature over ion temperature is obtained for low β(=plasma pressure/magnetic pressure) circular flux surface equilibria.
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Temperature gradient driven short wavelength modes in sheared slab plasmas
TL;DR: In this paper, an analytical analysis is performed to clarify the physics mechanisms for the modes in a shearless slab and the correlation between the growth rate and the real frequency of the modes is discussed in detail.
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Study of kinetic shear Alfvén instability in tokamak plasmas
TL;DR: In this article, it is shown that, in the presence of ion temperature gradient (ITG), the threshold value of plasma pressure gradient is well below that for ideal magnetohydrodynamic ballooning instability.
References
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Journal Article
Plasma Physics and Controlled Nuclear Fusion Research
TL;DR: In this paper, the first experiments in JET have been described, which show that this large tokamak behaves in a similar manner to smaller tokak, but with correspondingly improved plasma parameters.
Journal ArticleDOI
Electron temperature gradient driven turbulence
TL;DR: In this article, collisionless electron-temperature-gradient-driven (ETG) turbulence in toroidal geometry is studied via nonlinear numerical simulations via two massively parallel, fully gyrokinetic Vlasov codes.
Journal ArticleDOI
Turbulent transport reduction by zonal flows : Massively parallel simulations
TL;DR: Three-dimensional gyrokinetic simulations of microturbulence in magnetically confined toroidal plasmas with massively parallel computers showed that, with linear flow damping, an asymptotic residual flow develops in agreement with analytic calculations.
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Model of L- to H-mode transition in tokamak.
Sanae Inoue Itoh,Kimitaka Itoh +1 more
TL;DR: A "cusp-type catastrophe" among the radial electric field, particle flux, and edge gradients is found at the transition of tokamak plasmas, indicating a critical edge condition for the transition.
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Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes
TL;DR: In this article, a Fourier transform of a field line following basis with periodicity in toroidal and poloidal angles is applied to the simulation of ion temperature gradient (ITG) mode turbulence using a novel 3D nonlinear ballooning mode representation.