Investigation of the plasma jet penetration into the plasma on the Globus-M tokamak

Deep plasma fueling by the injection of high-speed high-density hydrogen plasma jet has been observed on Globus-M injection of unmagnetized hydrogen jet by a plasma gun led to a twofold increase of plasma core density. Presented here are the results of measurement of plasma jet velocities during the movement in the tokamak plasma. It is demonstrated that the deceleration times of the hydrogen and helium jets are in accordance with the predictions of the plasma jet penetration models based on consideration of the Alfvén conductivity of the plasma and inhomogeneity and curvature of the magnetic field. It is confirmed that the main mechanism governing the penetration depth of the jets in the tokamak plasma for considered conditions is the Alfvén conductivity.