The paper presents the results of the experimental investigation of the beam plasma discharge spatial structure in crossed fields induced by adding a high ionization potential gas to the discharge.Direct experimental evidence of the polarization mechanism of the radial current in a device with this type of discharge has been obtained.The investigations of plasmas rotating in crossed electric and magnetic fields have shown that spatial separation of the working mixture components differing in mass is possible [l, 21. The system of that kind using a beam plasma discharge demonstrates high efficiency of both element and isotope separation [3], the latter being carried out in the stationary regimk, i.e. the device can be of interest for practical applications. The principal scheme of the device is shown in Fig. 1. It consists of a cylindrical metallic chamber (1) immersed in a longitudinal magnetic field. The chamber is limited by insulators (2) on which central electrodes (4) are installed. The electron gun (3) is located at one end of the chamber, the electron beam collector is located at the other end. The electron beam from the gun is injected into the chamber along its axis. The 1 Beitr. Plasmnphys., Bd. 24, H. 3

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