Publications by Wilfred Anthony Cooper

Three-Dimensional Corrugation of the Plasma Edge when Magnetic Perturbations are Applied for Edge-Localized Mode Control in MAST

The distortion of the plasma boundary when three-dimensional resonant magnetic perturbations (RMPs) are applied has been measured in MAST H-mode plasmas. When the n = 3 RMPs are applied to control edge-localized modes (ELMs), the plasma experiences a stron ...

Institute of Physics2012

Bifurcated Helical Core Equilibrium States in Tokamaks

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, David Pfefferlé, Federico David Halpern, Daniele Brunetti, Jonathan Rossel, Mattia Albergante

Tokamaks with weak to moderate reversed central shear in which the minimum rotational transform

q_{min}

is in the neighbourhood of unity can trigger bifurcated MagnetoHydrodynamic (MHD) equilibrium states, one of which is similar to a saturated ideal ...

2012

Exploitation of a general-coordinate guiding centre code for the redistribution of fast ions in deformed hybrid tokamak equilibria

Jonathan Graves, Wilfred Anthony Cooper, David Pfefferlé

Self-consistent fast ion distributions are usually obtained using a code that solves the guiding-centre equations, with an appropriate fast ion source (e.g. NBI pinis) and sink (e.g. collision operators). Straight field-line coordinate systems, such as Boo ...

Iop Publishing Ltd2012

Diamagnetic drift stabilized ballooning modes in a 3D heliotron

Wilfred Anthony Cooper, Ben McMillan

An analysis of kinetic ballooning modes is presented, ray trajectories for the inward shifted Large Helical Device configuration at modest and with an anisotropic pressure profile due to the hot particles are evaluated and an estimate of the margin ...

2012

Diamagnetic drift stabilized ballooning modes in a 3D heliotron

Wilfred Anthony Cooper, Ben McMillan

An analysis of kinetic ballooning modes is presented, ray trajectories for the inward shifted Large Helical Device configuration at modest $$ and with an anisotropic pressure profile due to the hot particles are evaluated and an estimate of the margi ...

IOP Publishing2012

Equilibrium and stability in a heliotron with anisotropic hot particle slowing-down distribution

Jonathan Graves, Wilfred Anthony Cooper

The equilibrium and linear fluid Magnetohydrodynamic (MHD) stability in an inward-shifted large helical device heliotron configuration are investigated with the 3D ANIMEC and TERPSICHORE codes, respectively. A modified slowing-down distribution function is ...

American Institute of Physics2012

MHD properties in the core of ITER-like hybrid scenarios

Jonathan Graves, Wilfred Anthony Cooper, Federico David Halpern, Daniele Brunetti

MHD stability is studied in the frame of ITER like hybrid scenarios, characterized by weak reversed shear, with particular attention on ideal internal kink modes and infernal mode stability. Numerical simulations for ITER like equilibria, with hollow q pro ...

Iop Publishing Ltd2012

MHD equilibrium and stability of tokamaks and RFP systems with 3D helical cores

Olivier Sauter, Jonathan Graves, Wilfred Anthony Cooper

Bifurcated magnetohydrodynamic (MHD) equilibrium states are computed for ITER hybrid scenario and RFX-mod SHAx configurations with very flat or reversed core magnetic shear conditions. In the ITER studies, the minimum inverse rotational transform qmin is n ...

IOP Publishing2011

JET Snake Magnetohydrodynamic Equilibria

Olivier Sauter, Jonathan Graves, Wilfred Anthony Cooper

Magnetohydrodynamic (MHD) equilibrium states with a three-dimensional helical core that display the characteristics of a saturated ideal internal kink mode are computed to model snake structures that have been observed in the JET tokamak [A.~Weller et al. ...

IOP Publishing2011

Helical core tokamak MHD equilibrium states

Olivier Sauter, Basil Duval, Stefano Coda, Jonathan Graves, Wilfred Anthony Cooper, Holger Reimerdes, Benoît Labit, Antoine Pochelon, Jonathan Rossel, Mattia Albergante

Bifurcated magnetohydrodynamic tokamak equilibrium states with axisymmetric or helical core structure are computed. When a peaked pressure profile is chosen, the helical core structures appear like the {em snakes} that are observed in the JET tokamak. They ...

Caroline Wilkinson2011

Wilfred Anthony Cooper

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Three-Dimensional Corrugation of the Plasma Edge when Magnetic Perturbations are Applied for Edge-Localized Mode Control in MAST

Bifurcated Helical Core Equilibrium States in Tokamaks

Exploitation of a general-coordinate guiding centre code for the redistribution of fast ions in deformed hybrid tokamak equilibria

Diamagnetic drift stabilized ballooning modes in a 3D heliotron

Diamagnetic drift stabilized ballooning modes in a 3D heliotron

Equilibrium and stability in a heliotron with anisotropic hot particle slowing-down distribution

MHD properties in the core of ITER-like hybrid scenarios

MHD equilibrium and stability of tokamaks and RFP systems with 3D helical cores

JET Snake Magnetohydrodynamic Equilibria

Helical core tokamak MHD equilibrium states

MHD equilibrium and stability of tokamaks and RFP systems with 3D helical cores

Three-Dimensional Corrugation of the Plasma Edge when Magnetic Perturbations are Applied for Edge-Localized Mode Control in MAST

Equilibrium and stability in a heliotron with anisotropic hot particle slowing-down distribution

Helical core tokamak MHD equilibrium states

Diamagnetic drift stabilized ballooning modes in a 3D heliotron

Exploitation of a general-coordinate guiding centre code for the redistribution of fast ions in deformed hybrid tokamak equilibria

JET Snake Magnetohydrodynamic Equilibria

Bifurcated Helical Core Equilibrium States in Tokamaks

Diamagnetic drift stabilized ballooning modes in a 3D heliotron

MHD properties in the core of ITER-like hybrid scenarios