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This article describes a type quasisteady arc plasma source developed for investigation of edge plasma physics in a fusion device. The source is a modification of the gas-loaded washer-stack plasma gun ͓J. Osher, Rev. Sci. Instrum. 53, 1685 ͑1982͔͒. One of the principal features of describing the source is the formation of electrostatic thermobarrier for plasma electrons near the output of the plasma source. It has been created by changing the polarity of the voltage applied to the discharge asdoi:10.1063/1.1149134 fatcat:jitey6iq7bcxbpirz4rfl2smji