Ideal MHD restricts both the current and the pressure which can be stably confined in a Tokamak. A pressure profile opthisation is carried out for a variety of equilibria, which include JET and INTOR-like plasmas, in order to obtain the maximun! p which can be stably confined at constant current. The current is limited to a value correspndinq to a safety factor slightly above 2 at the plasma surface. A simple scaling law is found that fits well all the cases and which predicts a linear rise of 3 with the current.

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