TY - JOUR

T1 - The HAGIS self-consistent nonlinear wave-particle interaction model

AU - Pinches, S.D.

AU - Appel, L.C.

AU - Candy, J.

AU - Sharapov, S.E.

AU - Berk, H.L.

AU - Borba, D.

AU - Breizman, B.N.

AU - Hender, T.C.

AU - Hopcraft, K.I.

AU - Huysmans, G.T.A.

AU - Kerner, W.

PY - 1998/6/1

Y1 - 1998/6/1

N2 - The problem of modelling the self-consistent interaction of an energetic
particle ensemble with a wave spectrum specific to magnetically confined
plasmas in a torus is discussed. Particle motion in a magnetic field
coordinate system, whose surfaces are perturbed by a spectrum of finite
amplitude magnetohydrodynamical (MHD) waves, is described using a
Hamiltonian formulation. Employing the δƒ method enables the
simulation particles to only represent the change in the total particle
distribution function and consequently possesses significant
computational advantages over standard techniques. Changes to the
particle distribution function subsequently affect the wave spectrum
through wave-particle interactions. The model is validated using large
aspect-ratio asymptotic limits as well as through a comparison with
other numerical work. A consideration of the Kinetic Toroidal
Alfvén Eigenmode instability driven by fusion born
α-particles in a D-T JET plasma illustrates a use of the code and
demonstrates nonlinear saturation of the instability, together with the
resultant redistribution of particles both in energy and across the
plasma cross section.

AB - The problem of modelling the self-consistent interaction of an energetic
particle ensemble with a wave spectrum specific to magnetically confined
plasmas in a torus is discussed. Particle motion in a magnetic field
coordinate system, whose surfaces are perturbed by a spectrum of finite
amplitude magnetohydrodynamical (MHD) waves, is described using a
Hamiltonian formulation. Employing the δƒ method enables the
simulation particles to only represent the change in the total particle
distribution function and consequently possesses significant
computational advantages over standard techniques. Changes to the
particle distribution function subsequently affect the wave spectrum
through wave-particle interactions. The model is validated using large
aspect-ratio asymptotic limits as well as through a comparison with
other numerical work. A consideration of the Kinetic Toroidal
Alfvén Eigenmode instability driven by fusion born
α-particles in a D-T JET plasma illustrates a use of the code and
demonstrates nonlinear saturation of the instability, together with the
resultant redistribution of particles both in energy and across the
plasma cross section.

U2 - 10.1016/S0010-4655(98)00034-4

DO - 10.1016/S0010-4655(98)00034-4

M3 - Article

SN - 0010-4655

VL - 111

SP - 133

EP - 149

JO - Computer Physics Communications

JF - Computer Physics Communications

IS - 1

ER -