Messung der lokalen Elektronentemperatur und Elektronendichte in einem Θ-Pinch mittels der Streuung eines Laserstrahls

Abstract

The development of light scattering by a plasma as a diagnostic tool is reported, which allows the local measurement of electron density and electron temperature. After a résumé of known theoretical results the feasibility of scattering experiments is discussed. The ratio of scattered radiation to plasma radiation is estimated. The experimental setup is described. Using fiber optics, it was possible to measure the whole spectrum of scattered light by one pinch discharge only. Several types of obtained spectra are modified by collective effects between the particles in the plasma. The building up of the satellite lines in the spectra is found as well as the existence of a small central line, as was predicted by the theory. Absolute calibrations of intensities also show the decrease of the scattering cross-section. From the spectra plasma parameters could be derived