Stuttgart 2012 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 13: Poster: Niedertemperaturplasmsen
P 13.8: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.III
Laser Induced Fluorescence measurements of wave phenomena in the VINETA experiment. — •Damian Niemczyk1, Olaf Grulke1, and Thomas Klinger1,2 — 1Max-Planck-Institute for Plasma Physics, EURATOM Association, Greifswald — 2Ernst-Moritz-Arndt University, Greifswald
Laser induced fluorescence (LIF) provides a non-intrusive diagnostic method to determine the ion energy distribution function (IEDF) and its perturbations by electromagnetic fields of, e.g., wave phenomena. Temporal changes in the IEDF yield information about the wave's electric field. This method is demonstrated in the experiment VINETA for electrostatic and electromagnetic waves. The used LIF scheme consists of a diode laser with a center wavelength of 668.61nm, a tuning range of 30pm, and CW operation power of 40mW. Temporal resolution can be achieved by using either a digital lock-in-amplifier or a transient recorder built on a digital acquisition card. Further discrimination of the induced fluorescence signal with respect to the phase of the wave, can be achieved if the chopping of the laser signal is done with a frequency much higher than the wave's frequency. Inversion of the Vlasov equation then yields the wave's electric field.