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Manuscript Title: Magnetic configurations for axisymmetric tandem mirror devices.
Authors: S. Cuperman, L. Ofman
Program title: TANDEM
Catalogue identifier: AALK_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 42(1986)217
Programming language: Fortran.
Computer: CDC 170-855/D0.
Operating system: NOS. 2.4.1 - 630/628.
RAM: 100K words
Word size: 64
Peripherals: graph plotter.
Keywords: Plasma physics, Controlled thermonuclear, Research (ctr), Tandem mirror devices, Axisymmetric magnetic, Configurations, Magnetic confinement.
Classification: 19.9.

Nature of problem:
The program determines the physical parameters of desired magnetic configurations for axisymmetric tandem mirror devices consisting of a large number of magnetic coils. Two main problems are considered: 1) Calculation and optimization of resultant on and off-axis magnetic fields and 2) Calculation of the magnetic flux surfaces having the property that the magnetic field lines lie within them.

Solution method:
The program uses standard numerical methods. Self-consistency is obtained by iterative procedures.

Running time:
Execution times depend on the number of magnetic coils used (that is, on the complexity of the shape of the overall magnetic configuration) as well as on their sizes. On the CDC 855, for a configuration consisting of 38 solenoids with external diameters ranging between 14cm and 128cm and spread over an axial distance of 572cm, the following execution times are required: (i) calculation of the axial magnetic field on axis- 0.363 sec cp (approximate evaluation) to 2.61 sec cp (correct evaluation; (ii) calculation of the off-axis axial magnetic field - 55.9 sec cp; (iii) calculation of the off-axis radial magnetic field - 47.3 sec cp: (iv) calculation of the magnetic potential - 120 sec cp; (v) calculation of a magnetic flux surface - 627.6 sec cp.