Toroidal plasma equilibrium with closed magnetic lines of force

The magnetostatic equilibrium is investigated of plasma with a scalar pressure in closed magnetic lines of force. The configuration considered does not reduce to an axisymmetric one, even when the toroidicity of the system tends to zero. An expansion procedure with respect to the ratio of the plasma radius to the period of corrugation of the field is applied. An expression for the constant-pressure surface with an elliptic cross section is obtained. (author)