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Given the high cost of magnetic fusion experimental devices it is important to have reliable and predictive tools for their operation. This, together with the complexity of the geometry, has prompted a major effort in the development of numerical techniques. The exploitation of ideal magnetohydrodynamic (MHD) codes has yielded an extremely useful scaling law for the maximum achievable pressure in a tokamak. After analysing the stability of several configurations, assuming various plasma current and pressure profiles, the conclusion is extremely simple: the pressure limit in a tokamak is proportional to the plasma current and to the magnetic field strength, and inversely proportional to the minor radius of the plasma. The proportionality constant has been obtained from computations and has been shown to be almost the same in all existing tokamaks.

Additional information

Authors: VILLARD L, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne (CH)
Bibliographic Reference: Article: Europhysics News (1998)
Record Number: 199810842 / Last updated on: 1998-07-20
Original language: en
Available languages: en