Radial current in tokamak during neutral beam injection

Generation of radial current $I_r$ during the ionization of fast deuterons in their neutral beam injected into a tokamak is considered. The current $I_r$ and force $F$ determined by the $[I_r\times B]$ product vary in a complicated manner along the tokamak radius. For this reason, the torque that arises together with force $F$ also nonuniformly varies along the radius, which can lead to a shear in the rotation velocity. A sufficiently large magnitude of this shear can result in reduction of both micro- and macroinstabilities in tokamak plasma [1, 2]. The influence of injected beam characteristics and other experimental parameters on the spatial distribution of $I_r$ in the TUMAN-3M tokamak is considered.