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 × 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.