Göttingen 2025 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 17: Poster Session II

P 17.31: Poster

Mittwoch, 2. April 2025, 16:15–18:15, ZHG Foyer 1. OG

Improving the signal to noise ratio of a TALIF diagnostic ap- plied to a hydrogen plasma for enhanced hydrogen EDF de- termination — •Julian Hörsch, Christian Wimmer, and Ursel Fantz — Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching bei München, Germany

Two photon Absorption Laser Induced Fluorescence (TALIF) is a plasma diagnostic technique that can be used to measure the density and energy distribution function (EDF) of atomic hydrogen. The simultaneous absorption of two photons leads to the excitation of ground state hydrogen atoms to the n=3 level and a subsequent fluorescence decay to the n=2 level. The fluorescence decay emits Balmer H-alpha radiation, which can be detected for density and EDF measurements. Since the plasma emits strong H-alpha radiation, weak fluorescence signals received from TALIF are difficult to measure. The determination of the EDF requires an accurate measurement of the line profile, particularly in the wings of the line profile. For that it is important to distinguish the signal from the background noise. To be able to measure these wings of the EDF and thus the predicted deviations from a Maxwellian EDF, optimizations of the detector and the optical setup such as laser focusing and beam compression are investigated.

Keywords: TALIF; SNR; EDF