Hannover 2020 – scientific programme
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P: Fachverband Plasmaphysik
P 5: Poster Session 1
P 5.35: Poster
Monday, March 9, 2020, 16:30–18:30, Empore Lichthof
TDLAS analysis of the magnetic field strength by Zeeman splitting and gas temperature by Doppler broadening in the linear plasma device PSI-2 — •Marc Sackers, Oleksandr Marchuk, Sven Dickheuer, Stephan Ertmer, and Arkadi Kreter — Forschungszentrum Jülich GmbH - Institut für Energie- und Klimaforschung - Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany
Tunable diode laser absorption spectroscopy (TDLAS) is a promising technique to estimate the magnetic field strength in a low-density weakly magnetized plasma as well as the temperature of the gas constituents [1]. To obtain this information, the 4s24p5(2P3/2∘)5s J=2 –> 4s24p5(2P3/2∘)5p J=2 transition from metastable krypton was analyzed. Therefore, the wavelength of a tunable diode laser was tuned to the vacuum transition wavelength of 760.3638 nm and gradually scanned in both directions. A polarization cube was positioned in the optical path in front of the photodiode to detect the π- and σ-components of the transition individually and measure simultaneously. The obtained absorption spectrum of the signal was then used to create a suitable fit with the Doppler broadening and Zeeman splitting as the two dominant contributions to the line broadening.
[1] S. Dickheuer et al. Atoms 7(2), 48 (2019)