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Manuscript Title: TOPIC: a tokamak plasma impurities code. | ||

Authors: T.A. Beu, F. Spineanu, M. Vlad, R.I. Campeanu, I.I. Popescu | ||

Program title: TOPIC | ||

Catalogue identifier: ACDY_v1_0Distribution format: gz | ||

Journal reference: Comput. Phys. Commun. 36(1985)161 | ||

Programming language: Fortran. | ||

Computer: CDC CYBER 170-720. | ||

Operating system: NOS1P4 552/552. | ||

RAM: 1K words | ||

Word size: 64 | ||

Peripherals: disc. | ||

Keywords: Tokamak, Plasma physics, Impurities, Diffusion equation, Coupled differential Equations, Three-diagonal block Matrix inversion, Magnetic confinement. | ||

Classification: 19.9. | ||

Nature of problem:In high temperature low density tokamak plasmas, radiation cooling by impurity atoms can be an important energy loss mechanism, since radiation is not reabsorbed. The coupled set of time-dependent diffusion equations for ionized tokamak plasma impurities is solved in conjunction with a simple model for neutral impurities, on the assumption of a cylindrical symmetry. The resultant density distributions are used in the subsequent computation of the related energy losses. | ||

Solution method:The set of coupled second order differential equations, describing the diffusion of impurities in the MHD approach, is discretized using a finite difference scheme. The resultant linear system, with a three- diagonal block matrix structure, is then solved by a special forward elimination - backward substitution technique. | ||

Running time:About 6 s for the test run ouput. |

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