Heat energy balance in a low-pressure SHF surfatron

Analysis is presented of the results of experimental studies of a radial heat flow $Q_T (z)$ along the plasma column of an SHF surfatron in Xe at a pressure of 0.5-1.2 Torr. Energy loss caused by the energy transfer to the walls by positive ions accelerated by the ambipolar diffusion field and the potential gradient near the discharge tube wall was found to play an important part. This channel of energy loss is most effective in heavy gases. In the experimental conditions of this study. the properties of the discharge along its total length can be described by means of a single kinetic plasma model.