NOVELTY - Invention may be used to develop plasma accelerators with a closed electron drift and an extended acceleration zone (CEDA). CEDA comprises a discharge chamber (1) with external (2) and internal (3) dielectric walls. Walls (2 and 3) form an acceleration channel closed in azimuthal direction with a closed end part and an open output part. An anode - gas distributor (4) is installed in an accelerating channel at the side of its closed end part. The compensator cathode is placed behind the accelerating channel cut..    USE - Electricity.    ADVANTAGE - Reduced flow of accelerated ions directed towards discharger chamber walls and accordingly higher traction efficiency and increased CEDA resource. 6 cl, 2 dwg    DETAILED DESCRIPTION - Sources of magnetomotive force are made in the form of electromagnetic magnetisation coils (5, 6). A magnetic conductor comprises magnetic conducting elements (7) and cores (8 and 9). External (10) and internal (11) magnetic screens made of a soft magnetic material are arranged at the external sides of the walls (2 and 3) and surround the accelerating channel at the side of its closed part. External and internal magnetic poles (12, 13, 14, 15) are closed in azimuthal direction and are arranged at the outer sides of the walls (2 and 3). Poles are divided into two pairs, every of which forms a pole-to-pole gap. Poles (12 and 13) of the first pair form the first pole-to-pole gap near the accelerating channel cut. Poles (14 and 15) of the second pair form the second pole-to-pole gap in the area between the anode - gas distributor (4) and the accelerating channel cut. Poles (14 and 15) of the second pair are installed creating gaps relative to poles (12 and 13) of the first pair and relative to magnetic screens (10 and 11). Length of poles (14 and 15) of the second pair forms at least a half of the accelerating channel width. End planes of poles (14 and 15) at the side of the channel cut match the plane of the accelerating channel cross section, stretching via the gap between end planes of magnetic screens (10 and 11) and magnetic poles (12 and 13) of the first pair    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of Plasma accelerator with closed electron drift.