Study of sputtered Si-atoms in front of a TEXTOR-limiter by laser-induced fluorescence
An optical system has been installed in the sector of the limiter lock of TEXTOR in order to study by laser-induced fluorescence the density and velocity distribution of atomic impurities in front of a test limiter. In the present case, it was a brick of silicon carbide material. Experiments were carried out on the silicon line at 251.6 nm, using a pulsed dye laser with a repetition rate of 20 Hz. By means of fast pressure tuning of the laser wavelength during the flat-top of the plasma shot, spectral profiles were measured with a resolution of l pm at an average line density of 2 x 1.0 E13/cm3. The profiles correspond to sputtered atoms escaping from the limiter. The velocity dependent penetration depth of these atoms was measured.
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. III (1993) pp. 1123-1126
Record Number: 199311146 / Last updated on: 1994-11-29
Original language: en
Available languages: en