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Jonathan Graves

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Publications associées (326)

Mechanism for blob generation in the TORPEX toroidal plasma

Stephan Brunner, Ambrogio Fasoli, Ivo Furno, Jonathan Graves, Mario Ludovico Podesta, Francesca Maria Poli, Benoît Labit, Paolo Ricci, Christian Gabriel Theiler

The mechanism for blob generation is detailed in the toroidal magnetized plasma of the TORPEX device [ Fasoli et al., Phys. Plasmas 13, 055902 (2006) ] using an experimental configuration, which features a plasma region dominated by a coherent wave and a r ...

2008

Impact of pressure anisotropy on tokamak equilibria and the toroidal magnetic precession

Wilfred Anthony Cooper, Martin Jucker, Jonathan Graves

Using a generalized anisotropic tokamak equilibrium and an exact guiding centre drift formulation, the effect of parallel and perpendicular anisotropy on the toroidal precession drift is investigated. Signiﬁcant differences between parallel and perpendicul ...

2008

Sawtooth control using off-axis NBI

Jonathan Graves

2008

Global plasma oscillations in electron internal transport barriers in TCV

Timothy Goodman, Olivier Sauter, Andrea Scarabosio, Jonathan Graves, Emiliano Fable, Costanza Zucca

2008

Dissipative processes in interchange driven scrape-off layer turbulence

Richard Pitts, Jan Horacek, Jonathan Graves

First principles expressions are given for the parameters governing collisional diffusion and parallel losses of mass, momentum and energy in tokamak scrape-off layer (SOL) plasmas. These dissipative, or damping, coefficients are based on neoclassical perp ...

IOP Publishing Ltd2007

Stability analysis of internal ideal modes in low-shear tokamaks

Jonathan Graves

The stability of internal, ideal modes in tokamaks with low magnetic shear in the plasma core is analyzed. For equilibria with large aspect ratio, a parabolic pressure profile and a flat q profile in the core, an exact solution of the ideal magnetohydrodyn ...

American Institute of Physics (AIP)2007

Turbulent transport in the TCV SOL

Richard Pitts, Jan Horacek, Jonathan Graves

From probe measurements in the far SOL of TCV it is demonstrated that while the particle density profile becomes increasingly broader with increasing line averaged density, the radial variation of the fluctuation statistics remains the same. Excellent agre ...

2007

Fluid magnetohydrodynamic stabilit in a heliotron with anisotropic fast particle species

Wilfred Anthony Cooper, Martin Jucker, Jonathan Graves

The local and global fluid magnetohydrodynamic stability properties of anisotropic pressure plasmas are investigated with the Kruskal-Oberman and rigid hot particle Johnson et al energy principles. A Heliotron configuration that models the Large Helical De ...

2007

Modeling sawtooth stabilization by energetic ions from neutral beam injection

Jonathan Graves

Recent advances in modeling the effects of anisotropic energetic ion distributions have enabled the development of a complete coherent physics explanation of sawtooth stabilization in both conventional and spherical tokamaks. As an example, a complete mode ...

2007

Safety factor corrections to the magnetohydrodynamic internal kink mode in a tokamak

Jonathan Graves

It has long been acknowledged that the well known and frequently used stability criterion beta(p)< 0.3 for the toroidal ideal magnetohydrodynamic internal kink mode in a tokamak is inaccurate for an empirically relevant safety factor. The present paper out ...

2007

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Jonathan Graves

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Mechanism for blob generation in the TORPEX toroidal plasma

Impact of pressure anisotropy on tokamak equilibria and the toroidal magnetic precession

Sawtooth control using off-axis NBI

Global plasma oscillations in electron internal transport barriers in TCV

Dissipative processes in interchange driven scrape-off layer turbulence

Stability analysis of internal ideal modes in low-shear tokamaks

Turbulent transport in the TCV SOL

Fluid magnetohydrodynamic stabilit in a heliotron with anisotropic fast particle species

Modeling sawtooth stabilization by energetic ions from neutral beam injection

Safety factor corrections to the magnetohydrodynamic internal kink mode in a tokamak

NTM prevention by ICCD control of fast-ion-stabilised sawteeth

Fluid Plasma Stability in Stellarators with Anisotropic Energetic Species

Modification of sawtooth oscillations with ICRF waves in the JET tokamak

The impact of triangularity on plasma confinement: TCV experiments vs non-linear gyrokinetic modelling

The impact of triangularity on plasma confinement: TCV experiments vs non-linear gyrokinetic modelling

The Physics of Sawtooth Stabilisation (invited paper)

Computational fusion plasma physics

Computational fusion plasma physics

Asymmetric Distributions of Energetic Circulating Ions and Sawtooth Control using ICCD and Unbalanced NBI

Single particle orbits in anisotropic fully shaped plasmas