Doppler Broadening and Magnetic Field Effects on the Balmer Lines Emitted at the Edge of a Tokamak Plasma

Hey, John D.; Korten, M.; Lie, Y.T.; Pospieszczyk, A.; Rusbüldt, D.; Schweer, B.; Unterberg, B.; Wienbeck, J.; Hintz, E.

doi:10.1002/ctpp.2150360505

Cited by 67 publications

(139 citation statements)

References 34 publications

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“…Yet for neutral emitters, asymmetric line profiles due to the Stark effect are predicted [4]. However, for further explanations of the observed phenomena in future work, one should evaluate effects associated with internally generated micro electromagnetic fields [4][5][6][7]24,33] in nanomaterial.…”

Section: Discussionmentioning

confidence: 99%

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Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Sherbini

Parigger

2018

Atoms

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This work communicates results from optical emission spectroscopy following laser-induced optical breakdown at or near nanomaterial. Selected atomic lines of silver are evaluated for a consistent determination of electron density. Comparisons are presented with Balmer series hydrogen results. Measurements free of self-absorption effects are of particular interest. For several silver lines, asymmetries are observed in the recorded line profiles. Electron densities of interest range from 0.5 to 3 × 10 17 cm −3 for five nanosecond Q-switched Nd:YAG radiation at wavelengths of 1064 nm, 532 nm, and 355 nm and for selected silver emission lines including 328.06 nm, 338.28 nm, 768.7 nm, and 827.3 nm and the hydrogen alpha Balmer series line at 656.3 nm. Line asymmetries are presented for the 328.06-nm and 338.28-nm Ag I lines that are measured following generation of the plasma due to multiple photon absorption. This work explores electron density variations for different irradiance levels and reports spectral line asymmetry of resonance lines for different laser fluence levels.

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Section: Discussionmentioning

confidence: 99%

“…(I) Self-reversal is characterized by a large dip at the central wavelength [33], (II) Self-absorption, and (III) Asymmetries.…”

Section: Discussionmentioning

confidence: 99%

Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Sherbini

Parigger

2018

Atoms

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“…͑18 and 30 allowed, 2 and 4 ⌬J forbidden͒. [5][6][7] The corresponding perturbed line strengths are calculated according to the method described in Ref. 23.…”

Section: Analysis Of the Zeeman Profiles And Discussionmentioning

confidence: 99%

“…1,2 Its quantitative estimate is required for the purpose of evaluating the particle fueling rate and controling the recycling neutrals in the long pulse discharge operation. 3,4 Information on neutral atoms has been obtained from spectroscopic measurements of the Zeeman ͑Paschen-Back͒ split profiles of lines emitted from the divertor or the periphery region in TEXTOR ͑Tokamak-Experiment for Technology Oriented Research͒, [5][6][7][8] JT-60U ͑Japan atomic energy research institute Tokamak-60 Upgrade͒, 9,10 Alcator C-Mod, [11][12][13] Doublet III-D, [14][15][16] ASDEX-U ͑Axially Symmetric Divertor Experiment Upgrade͒, 17,18 Tore Supra, 19,20 TRIAM-1M ͑Torus of Research Institute for Applied Mechanics͒ ͑Ref. 21͒ for hydrogen/deuterium, and in LHD ͑Large Helical Device͒ for helium.…”

Section: Introductionmentioning

confidence: 99%

Polarization resolved Hα spectra from the large helical device: Emission location, temperature, and inward flux of neutral hydrogen

et al. 2005

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Spectral profiles of the Hα line emitted from the large helical device plasma [O. Motojima et al., Phys. Plasmas 6, 1843 (1999)] have been measured with polarization-separation optics and a high-resolution spectrometer. Besides the underlying high-temperature component, which probably arises from charge-exchange recombination, the profiles are interpreted as superpositions of Zeeman profiles for two different magnetic field strengths. The emission locations are thus identified on the magnetic field map; the emissions are localized in the inner and outer regions just outside the ergodic layer, and each field-strength contribution to the overall Zeeman profile represents two radiator temperatures, and inward atom flow velocities in the range of (1–7)×103m∕s.

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“…Line shape measurements of atomic hydrogen emissions have provided information about velocity distributions of the atoms. J. D. Hey et al measured the Balmer series line shapes in TEXTOR [1]. They found that the velocity distributions of the excited hydrogen or deuterium atoms were in non-thermal.…”

Section: Introductionmentioning

confidence: 99%

A Collisional-Radiative Model for Hydrogen Atom Including Velocity Changing Collisions

Fujii

Shikama

Sawada

et al. 2011

Plasma and Fusion Research

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We develop a collisional-radiative model for calculating the velocity distributions of excited hydrogen atoms. In the model, the velocity distributions are approximated using linear combinations of several basis functions which are treated as discrete velocity states, and only charge exchange collisions with proton are considered as velocity changing collisions. The populations in the velocity and excited states are calculated under an assumption of a quasi-stationary state. With the model we derive the velocity distribution of the ground state atoms from that of excited atoms in the n = 3 level observed for an LHD plasma, where n is the principal quantum number. The mean kinetic energy of the ground state atoms is estimated to be 5.6 eV, which is 0.05 eV less than that of the n = 3 atoms.

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Doppler Broadening and Magnetic Field Effects on the Balmer Lines Emitted at the Edge of a Tokamak Plasma

Cited by 67 publications

References 34 publications

Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Polarization resolved Hα spectra from the large helical device: Emission location, temperature, and inward flux of neutral hydrogen

A Collisional-Radiative Model for Hydrogen Atom Including Velocity Changing Collisions

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