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P: Plasmaphysik

P 10: Theory and Plasma Diagnostic (Poster Session)

P 10.17: Poster

Wednesday, April 4, 2001, 12:30–15:00, AT2

Numerical simulation of a multi-channel light scattering diagnostic system for low temperature plasmas — •K. Kaczor und H. Soltwisch — Institut für Experimentalphysik V,Ruhr-Universität Bochum, Germany

In previous works a multi-channel light scattering diagnostic system has been developed to investigate the electron component of reactive plasmas using Thomson scattering in a GEC reference cell. The setup utilizes a photon counting technique to detect the temporal behaviour of the scattered light simulateously in eight spectral channels. Analysing the pulse shape of the stray light, Thomson scattering light is distinguishable from fluorescence light of low intensity, which can affect measurements in molecular plasmas dramatically. As light sources two laser systems are used: a frequency doubled tunable Ti:Sapphire laser (430 nm - 470 nm) with 1mJ per pulse and a frequency doubled Nd:YLF laser (527 nm) with 3 mJ - 10 mJ per pulse, both at 1 kHz repetition rate. In order to take into account the effects of the counting mode of the used electronics a numerical simulation was developed, which includes the light scattering and the detection electronics. It is used to estimate the detection limit and to optimise the experimental setup. In addition it generates simulated data, which can be used to isolate errors in the analysis of the measured data. The data of the numerical simulation will be compared with measured data and the results will be discussed.