Superthermal X radiation in the TM-3 tokamak

Accelerated electrons producing in a toroidal electric field of a tokomak cause an epithermal X radiation from a plasma volume. It contains characteristic radiation of impurity ions alongside a continuum. The aim of the paper is to estimate a quantity of impurities, and also a number of accelerated electrons and the fraction of a toroidal current carried over by them on the base of the intensity of characteristic lines. It has been possible to obtain absolute estimates owing to a dosed addition of krypton into hydrogen served as an operating gas. Under the assumption that krypton is accumulated in plasma due to 'ion evacuation', the maximum fraction of current transferred by escaping electrons in the regime under investigation Jsub(sec) approximately 1 kA at the total current J approximately 15 kA; linear density of accelerated electrons approximately 1012 cm-1 at Nsub(e)sup(0) = 2x1014 cm-1. Main impurities are tungsten (Nsub(w) approximately 1.5x1012 cm-1) and elements of the iron group (Nsub(Fe) approximately 8x1012 cm-1). This maximum estimation of impurities allows one to fit the measured electric conductivity of plasma to the calculated one