Projects per year
Abstract
A new global twofluid electromagnetic turbulence code, CENTORI, has been developed for the purpose of studying magneticallyconfined fusion plasmas on energy confinement timescales. This code is used to evolve the combined system of electron and ion fluid equations and Maxwell equations in toroidal configurations with axisymmetric equilibria. Uniquely, the equilibrium is coevolved with the turbulence, and is thus modified by it. CENTORI is applicable to tokamaks of arbitrary aspect ratio and high plasma beta. A predictor–corrector, semiimplicit finite difference scheme is used to compute the time evolution of fluid quantities and fields. Vector operations and the evaluation of flux surface averages are speeded up by choosing the Jacobian of the transformation from laboratory to plasma coordinates to be a function of the equilibrium poloidal magnetic flux. A subroutine, GRASS, is used to coevolve the plasma equilibrium by computing the steadystate solutions of a diffusion equation with a pseudotime derivative. The code is written in Fortran 95 and is efficiently parallelised using Message Passing Interface (MPI). Illustrative examples of output from simulations of a tearing mode in a large aspect ratio tokamak plasma and of turbulence in an elongated conventional aspect ratio tokamak plasma are provided.
Original language  English 

Pages (fromto)  23462363 
Number of pages  18 
Journal  Computer Physics Communications 
Volume  183 
DOIs  
Publication status  Published  2012 
Keywords
 Twofluid and multifluid plasmas; Drift waves; Tokamaks; Spherical tokamaks; Plasma turbulence; Magnetohydrodynamic and fluid equations
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Projects
 2 Finished


CASE Studentship: Tom Edwards
Hein, J.
UK industry, commerce and public corporations
1/09/06 → 31/08/09
Project: Research