Tokamak stability at high plasma pressures

The paper studies the hydromagnetic stability of a tokamak of circular cross-section for high values of β J – the ratio between the plasma pressure and the pressure of the poloidal magnetic field. It is shown that, for β J ≳,(R/a 0 ) 2/3 (R, a 0 being the large and small radii of the torus), the tokamak is more stable than for small values of β J .