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Manuscript Title: ATHENE 1A: a one-dimensional fusion code.
Authors: J.P. Christiansen, K.V. Roberts, V.A. Piotrowicz, J.W. Long, J.W. Johnston, A.A. Newton
Program title: ATHENE 1A
Catalogue identifier: ABUT_v2_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 23(1981)63
Programming language: Fortran.
Computer: ICL 2976.
Operating system: ICL VME/B.
Word size: 32
Keywords: Plasma physics, Thermonuclear fusion, Pinch devices, Reversed field pinches, 1-dimensional Equilibrium, Diffusion, Implicit, Impurities, Ionisation, Impurity transport.
Classification: 19.6.

Subprograms used:
Cat Id Title Reference
ABUF_v1_0 OLYMPUS CPC 7(1974)245
ABUF_v2_0 OLYMPUS FOR IBM 370/165 CPC 9(1975)51
ABUF_v3_0 OLYMPUS FOR CDC 6500 CPC 10(1975)167

Nature of problem:
The purpose of ATHENE 1A is to calculate the evolution of a high-beta toroidal CTR plasma in the cylindrical approximation, taking into account diffusion and other entropy-generating processes in a plasma which evolves through a sequence of magnetohydrodynamic pressure equilibria. The ATHENE 1A model is an extension of the previously published code ATHENE 1.

Solution method:
The plasma and the magnetic field are described by five main varibles and up to 5 impurity concentration levels which are functions of the time t and a single radial space variable r. The solution of the MHD equations in these ten variables is split into two stages. In stage 1, which uses a fixed Eulerian mesh, diffusion and other processes change the entropy of the mesh, diffusion and other processes change the entropy of the plasma-field configuration. Stage II is a Lagrangian calculation.

Version 1 of ATHENE 1A provides a simple model for the behaviour of plasma-pinch configurations. A number of physical effects such as ionization, recombination and diffusion of plasma impurities have been added and additional physics can easily be included in the code, e.g., by use of the EXPERT facility. In ATHENE 1A the initial radial profiles of the main variables can be altered as required.