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

Dickheuer, S.; Marchuk, O.; Tsankov, Tsanko Vaskov; Luggenhölscher, Dirk; Czarnetzki, Uwe; Gromelski, Wojciech; Ertmer, S.; Kreter, A.

doi:10.3390/atoms7020048

Cited by 6 publications

(15 citation statements)

References 23 publications

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“…The measurements of magnetic eld at the tip of Langmuir probes could be of a special interest as it allows to perform the tomography of the eld practically at any position in the plasma. Figure 8 shows an overview of the measured magnetic eld values determined in this work in comparison to the magnetic eld values calculated via the Biot-Savart law and the magnetic eld determined via tunable diode laser absorption spectroscopy (TDLAS) measurements on Ar I by [19,20]. Whereas the agreement with theoretical vacuum calculations is within 3%, the agreement with the experimental TDLAS data is within 10%.…”

Section: Discussionmentioning

confidence: 68%

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Optical isolation of spectral lines emitted by sputtered tungsten in a weakly magnetized plasma

Ertmer¹,

Marchuk²,

Kreter³

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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Optical isolation of the clockwise or the counter-clockwise circular polarization of spectral lines was applied to emission of sputtered tungsten atoms. As a result one measures the weak magnetic field at plasma-surface interface resulting in splitting of spectral lines (W I at 4008.751 Å and 4982.593 Å) being negligibly small with respect to the Doppler broadening. One relies only on the phase rotation of a reflected circular polarized light propagating at the normal incidence to the mirror-like surface. The spectral shift of the signal from sputtered W atoms on the detector using high-resolution spectrometer provides the value of the magnetic field at a known dispersion, i.e. no further modeling or additional assumption on the distribution of atoms is required. The isolation of spectral line components is equivalent to isolation of the effect of the magnetic field from the measured line shape. It is complete for Zeeman triplet lines and partial for other lines. The results are found to be in a very good agreement of 3% with calculations and the Zeeman resolved laser absorption spectroscopy (10%) on metastable levels of Ar I atoms.

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Section: Discussionmentioning

confidence: 68%

“…The experimental data presented in this work are within the error margin. The TDLAS results from[19,20] are slightly lower.…”

mentioning

confidence: 81%

Optical isolation of spectral lines emitted by sputtered tungsten in a weakly magnetized plasma

Ertmer¹,

Marchuk²,

Kreter³

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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“…The broadening of the Lyman-α line due to exothermic energy transfer between Ar m and H(n = 2) was reported by Clyne [34]. We hope that the newly-installed Tunable Diode Laser Absorption Spectroscopy (TDLAS) diagnostic [19], which measures the metastable fraction of Ar, combined with the emission measurements of fast atoms, will provide new insights into this excitation mechanism in the near future.…”

Section: Comparison Of Emission In Arh Krh and Neh Plasmamentioning

confidence: 72%

“…The applied magnetic field confines the plasma in a cylindrical geometry with a radius of about 5 cm. At the position of spectroscopic measurements, the value of the magnetic field is about 0.1 T [19]. The mirrors (1.3 × 1.3 cm 2 ) were installed in the target chamber using either the cooled axial or side manipulator.…”

Section: Experimental Setup At the Linear Plasma Device Psi-2mentioning

confidence: 99%

Emission of Fast Hydrogen Atoms in a Low Density Gas Discharge—The Most “Natural” Mirror Laboratory

Marchuk

Dickheuer

Ertmer

et al. 2019

Atoms

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In this work, we present a new application for the line shapes of emission induced by reflected hydrogen atoms. Optical properties of the solids in contact with the plasma could be effectively measured at the wavelength of Balmer lines: time-resolved measurements of reflectance and polarization properties of mirrors are performed using the wavelength separation of the direct and reflected signals. One uses the Doppler effect of emission of atoms excited by collisions with noble gases, primarily with Ar or with Kr. In spite of a new application of line shapes, the question of the source of the strong signal in the case of Ar exists: the emission observed in the case of the excitation of H or D atoms by Ar exceeds the signal induced by collisions with Kr atoms by a factor of five, and the only available experimental data for the ground state excitation show practically equal cross-sections for both gases in the energy range of 80–200 eV.

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“…Tunable diode laser absorption spectroscopy (TDLAS) is a measurement technique commonly used in a variety of applications recently as well as temperature and density of molecules in gas [15,16]. When a laser beam permeates an absorption medium, its intensity will be attenuated by the absorbing gas species.…”

Section: Theory Of Tdlasmentioning

confidence: 99%

Similarity Analysis for Time Series-Based 2D Temperature Measurement of Engine Exhaust Gas in TDLAT

Jang

Choi

2019

Applied Sciences

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As regulations on the emission of pollutants from combustion systems are further tightened, it is necessary to reduce pollutant species and improve combustion efficiency to completely understand the process in the combustion field. Tunable diode laser absorption tomography (TDLAT) is a powerful tool that can analyze two-dimensional (2D) temperature and species concentration with fast-response and non-contact. In this study, stabilized spectra were implemented using the mean periodic signal technique to enable real-time 2D temperature measurement in harsh conditions. A time series statistical-based verification algorithm was introduced to select an optimal spectral cycle to track 2D reconstruction temperature. The statistical-based verification is based on the Two-sample t test, root mean square error, and time-based Mahalanobis distance, which is a technique for similarity analysis between thermocouple and reconstruction temperature of 18 candidate cycles. As a result, it was observed that the statistical-based TDLAT contribute to improving the accuracy of time series-based 2D temperature measurements.

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

Cited by 6 publications

References 23 publications

Optical isolation of spectral lines emitted by sputtered tungsten in a weakly magnetized plasma

Optical isolation of spectral lines emitted by sputtered tungsten in a weakly magnetized plasma

Emission of Fast Hydrogen Atoms in a Low Density Gas Discharge—The Most “Natural” Mirror Laboratory

Similarity Analysis for Time Series-Based 2D Temperature Measurement of Engine Exhaust Gas in TDLAT

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