On the radial distribution of current density in a tokamak

Dependences of geometric position of specificities on a radial distribution profile of bremsstrahlung continuum intensity in the visible spectrum region Isub(lambda(r)) on discharge parameters in the T-7 tokamak have been investigated experimentally. It turned out that the dependences obtained are described satisfactorily by results of calculations performed upon the following assumptions: specificities on Isub(lambda(r)) profiles are related to a rational magnetic surface q=2; radial distribution of the plasma current density is determined on the base of a model of small-scale tearing-modes. The agreement was revealed as well upon comparing the calculation results with the data obtained in other tokamaks