Molecular emission in the edge plasma of T-10 tokamak

The experiments on recording molecular emission in the edge plasma of the T-10 tokamak are described. To obtain reliable spectra with sufficient spectral, temporal, and spatial resolution, the optical circuit is optimized for various experimental conditions. Typical spectra measured in two sections of the tokamak are shown. It is shown that, upon varying the parameters of the discharge, the molecular spectrum not only changes significantly in intensity but also undergoes a qualitative change in the rotational and vibrational structure. For a detailed analysis, we use the Fulcher-α system (d³Π_u–a³Σ _g ⁺ ) of deuterium in the wavelength range from 590 to 640 nm. The rotational temperatures of ground state X¹Σ _g ⁺ and upper excited state d³Π_u are estimated by the measured spectra.