Measurement of the Magnetic Field in a Linear Magnetized Plasma by Tunable Diode Laser Absorption Spectroscopy
| Autor: | Oleksandr Marchuk, Tsanko V. Tsankov, Uwe Czarnetzki, Dirk Luggenhölscher, Arkadi Kreter, S. Dickheuer, Wojciech Gromelski, S. Ertmer |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
absorption spectroscopy
Nuclear and High Energy Physics Materials science Absorption spectroscopy Physics::Optics 7. Clean energy 01 natural sciences 010305 fluids & plasmas law.invention symbols.namesake law 0103 physical sciences lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ddc:530 Physics::Atomic Physics 010306 general physics Absorption (electromagnetic radiation) Condensed Matter::Quantum Gases Zeeman effect Tunable diode laser absorption spectroscopy magnetized plasma Plasma Condensed Matter Physics Laser Atomic and Molecular Physics and Optics Magnetic field symbols Computer Science::Programming Languages lcsh:QC770-798 metastable Ar Atomic physics Doppler broadening |
| Zdroj: | Atoms 7(2), 48-(2019). doi:10.3390/atoms7020048 Atoms Volume 7 Issue 2 Atoms, Vol 7, Iss 2, p 48 (2019) |
| DOI: | 10.3390/atoms7020048 |
| Popis: | 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 &rarr 2 p 6 transition of atomic Ar with the wavelength &lambda = 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 &sigma and &pi components of the absorption spectrum, the line-integrated magnetic field on the order of 30&ndash 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&ndash 20%. |
| Databáze: | OpenAIRE |
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