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Measurement of the Magnetic Field in a Linear Magnetized Plasma by Tunable Diode Laser Absorption Spectroscopy

1
Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung-Plasmaphysik, Partner of the Triliteral Euregio Cluster (TEC), 52425 Jülich, Germany
2
Institute for Plasma and Atomic Physics, Ruhr University Bochum, 44780 Bochum, Germany
3
Institute of Plasma Physics and Laser Microfusion, 01497 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Atoms 2019, 7(2), 48; https://doi.org/10.3390/atoms7020048
Received: 26 March 2019 / Revised: 5 May 2019 / Accepted: 6 May 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Plasma Spectroscopy in the Presence of Magnetic Fields)
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Abstract

Tunable diode laser absorption spectroscopy (TDLAS) is a commonly used technique to measure the temperature and density of atoms or molecules in a gas. In this work, we demonstrate that the TDLAS diagnostics could be effectively applied to measure the magnetic field in a low-density weakly magnetized plasma using the Zeeman splitting of the absorption spectrum of lines from noble gases. The laser wavelength is tailored to fit the 1 s 5 2 p 6 transition of atomic Ar with the wavelength λ = 763.51 nm . Two mechanisms of line broadening and splitting are observed: Doppler broadening and Zeeman effect. The latter is especially pronounced by applying polarization-selective observation of the absorption to the TDLAS measurements. By fitting the σ and π components of the absorption spectrum, the line-integrated magnetic field on the order of 30–50 mT is determined. The agreement between the measured values and the vacuum field (neglecting the impact of the plasma) calculations on the axis of the PSI-2 is found to be about 15–20%. View Full-Text
Keywords: absorption spectroscopy; magnetized plasma; Zeeman effect; metastable Ar absorption spectroscopy; magnetized plasma; Zeeman effect; metastable Ar
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Dickheuer, S.; Marchuk, O.; Tsankov, T.V.; Luggenhölscher, D.; Czarnetzki, U.; Gromelski, W.; Ertmer, S.; Kreter, A. Measurement of the Magnetic Field in a Linear Magnetized Plasma by Tunable Diode Laser Absorption Spectroscopy. Atoms 2019, 7, 48.

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