The gas rotation in moving striations in a longitudinal magnetic field is examined. We study the case when the rotation is caused by the Ampere force affecting the eddy electric current which comes about because of a noncollinearity between gradients of the electron concentration and gradients of the temperature. Relations for the average velocity of gas rotation as a function of plasma parameters in the moving striations are obtained. Based on these relations, the estimations of average velocities are calculated for the typical experimental conditions.

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When the plasma expands across the confining magnetic field, a part of its thermal energy is converted to electrical energy. In the SOL of tokamaks, the motion of the plasma across the field due to turbulent processes is accompanied by its departure along the open lines of the magnetic field. The conversion of thermal energy is taken into account in theoretical studies devoted to the physics of plasma in the SOL; however, this conversion is ignored in numerical models, for example, in B2–SOLPS4.0. This paper deals with thermal-to-electrical energy conversion in the SOL of tokamaks. It is demonstrated that the part of the thermal energy subjected to conversion to electrical energy forms an appreciable part of the total energy flowing in the SOL. In ITER, this fraction may be as high as 20–25%. The electrical energy generated in the SOL volume is liberated in the form of Joule heat in a relatively cold plasma in the vicinity of diverter plates or directly on these plates.

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