The equipment for spectroscopic diagnostics of Ga impurities in the ISTTOK fusion plasma

Full text: Results of the development of equipment for spectroscopy of impurity vapor in fusion plasmas has been reported in framework of collaboration between EURATOM UL and EURATOM Portugal according to the project 'Investigation of metal ions in fusion plasmas using emission spectroscopy'. The equipment allows to obtain the spectral composition and intensity of plasma emission in seven directions, located in the symmetry plane of the plasma thor and cross the plasma in different distances from the center of thor. Intensity measurements are synchronized with initialization of the plasma discharge. The results of measurements represent the mean value of the emission during ∼ 40 msec, which is close to the plasma life time. The equipment involves objective, which focuses the plasma emission image at selected cross-section plane of plasma onto the entrance end of the optical fiber bundle. Aperture of the objective conforms to that of the spectrograph. Use of the optical fiber bundle allows adjust the spectroscopic equipment to the ISTTOK construction elements. Registration of the emission spectra is provided by the CCD camera pixel size being 128x1024. Each position of the plasma emission of given spectral line is registered at the column consisting from seven pixels. The control of the equipment, data acquisition and data analysis is provided by software developed in the LABWIEV environment