On resolving the optical spectra of the edge plasma radiation against a strong background of the divertor stray light

摘要

Abstract. A method of detecting a weak radiation of the Balmer lines from the hydrogen isotopes in the edge plasma of a tokamak (SOL) on the strong optical background formed by reflection of the light emitted from the divertor plasma is proposed. The method is based on a parallel registration of the radiation from the optical dump and from the wall near the dump. Calibration of the attenuation of the stray light radiation by the optical dump is being performed in the course of the measurements, .