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

9th International Conference on Modern Techniques of Plasma Diagnostics and their Application

Ognev, L.I.^1 ; Lisitsa, V.S.^1,2

National Research Centre, Kurchatov Institute, Moscow

123182, Russia^1

National Research Nuclear University MEPhI, Moscow, Russia^2

关键词: Balmer lines;    Divertor plasma;    Edge plasmas;    High frequency HF;    Hydrogen isotope;    Light radiation;    Optical spectra;    Weak radiations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/666/1/012005/pdf
DOI  :  10.1088/1742-6596/666/1/012005

来源: IOP

【 摘 要 】

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, using the intensity of the high-frequency pulsations that are not correlated with the edge plasma emission. Statistical estimates show that a 20-fold attenuation of the light by the dump allows registration of the weak edge plasma radiation making down to 0.5% of the background intensity.