Axial-asymmetric divertors for a tokamak device

The subject of the paper are non-symmetric divertors ensuring a low field reduction on the axis of a tokamak (field modulation 10-20%). The divertor parameters are determined both analytically and with the aid of numerical experiments based on a model of straight parallel rectangular rods and of a toroidal system composed of infinitely thin discrete coils, the plasma current is simulated by a current ring. The effect of field corrugation is neglected. It is shown that, as this takes place, resonance disturbances of magnetic surfaces do not exceed really possible ones due to errors in making the divertors. Another subject of the paper is the possibility of using the divertors under discussion for creation a magnetic diaphragm for heliotron operating conditions and for an AC tokamak