In situ measurement and modeling of hydrogen recycling and transport processes – the role of molecules

Pospieszczyk, A.; Mertens, Ph.; Sergienko, G.; Huber, A.; Philipps, V.; Reiter, D.; Rusbüldt, D.; Schweer, B.; Vietzke, E.; Greenland, P. T.

doi:10.1016/s0022-3115(98)00660-6

Cited by 66 publications

(59 citation statements)

References 12 publications

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“…Further study revealed that although the vibrational distribution of H 2 causes the dissociated products to distribute in lower energy, H(2s) from this dissociation channel have almost the dominant contribution to the Ha emission in the low energy plasmas [4] of the higher effective rates to be excited to the n = 3 state. This low energy component is also observed in Da profile in TEXTOR [5], and in Balmer-a emissions HT-6M [6] and HT-7 [7].…”

Section: Introductionmentioning

confidence: 82%

Balmer-α spectroscopic study on hydrogen recycling and molecular effects in HT-7

Xiao

Wan

Huang

2007

Journal of Nuclear Materials

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Section: Introductionmentioning

confidence: 82%

Balmer-α spectroscopic study on hydrogen recycling and molecular effects in HT-7

Xiao

Wan

Huang

2007

Journal of Nuclear Materials

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“…Thus, this emission band is frequently used for plasma diagnostics [32,[64][65][66]. Figure 11a,b show spectra of this band for v' = v'' = 0 and v' = v'' = 1 in hydrogen (between 600 nm and 618 nm) and deuterium (between 598 nm and 612 nm), respectively.…”

Section: Application Of the Modelsmentioning

confidence: 99%

Evaluation of State-Resolved Reaction Probabilities and Their Application in Population Models for He, H, and H2

Wünderlich

Fantz

2016

Atoms

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Population models are a prerequisite for performing qualitative analysis of population densities measured in plasmas or predicting the dependence of plasma emission on parameter variations. Models for atomic helium and hydrogen as well as molecular hydrogen in low-pressure plasmas are introduced. The cross-sections and transition probabilities used as input in the atomic models are known very accurately, and thus a benchmark of these models against experiments is very successful. For H 2 , in contrast, significant deviations exist between reaction probabilities taken from different literature sources. The reason for this is the more complex internal structure of molecules compared to atoms. Vibrationally resolved models are applied to demonstrate how these deviations affect the model results. Steps towards a consistent input data set are presented: vibrationally resolved Franck-Condon factors, transition probabilities, and ionization cross-sections have been calculated and are available now. Additionally, ro-vibrational models for selected transitions are applied successfully to low-density, low-temperature plasmas. For further improving the accuracy of population models for H 2 , however, it is necessary to establish a comprehensive data set for ro-vibrationally resolved excitation cross-sections based on the most recent calculation techniques.

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“…Emission intensities of excited hydrogen atoms and molecules have been analyzed for over a decade. From atomic emission line ratios, the electron density, temperature, and dissociation ratios have been estimated [3][4][5] from the comparison with a collisional-radiative model of hydrogen developed by Sawada et al [6,7]. From molecular line ratios, the rotational and vibrational temperatures, which are related to the background gas temperature, have been determined [8,9].…”

Section: Introductionmentioning

confidence: 99%

Development of Multi-Wavelength-Range High-Resolution Spectrometer for Hydrogen Atomic and Molecular Emission Lines

Fujii

Shikama

Iwamae

et al. 2010

Plasma and Fusion Research

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We have developed a spectrometer specialized for a simultaneous high-resolution measurement of emission spectra of the hydrogen atomic Balmer-α, -β, -γ lines and molecular Fulcher-α (v = v = 0) and (v = v = 2) ro-vibronic bands, where v and v is the vibrational quantum number. The instrumental widths for the respective wavelength ranges are 0.008, 0.009, 0.010, 0.008, and 0.007 nm. We apply the spectrometer to the observation of emissions from a LHD plasma. The observed profiles of these emission lines and bands show polarization dependence. The absolute intensities of these emissions are also estimated.

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In situ measurement and modeling of hydrogen recycling and transport processes – the role of molecules

Cited by 66 publications

References 12 publications

Balmer-α spectroscopic study on hydrogen recycling and molecular effects in HT-7

Balmer-α spectroscopic study on hydrogen recycling and molecular effects in HT-7

Evaluation of State-Resolved Reaction Probabilities and Their Application in Population Models for He, H, and H2

Development of Multi-Wavelength-Range High-Resolution Spectrometer for Hydrogen Atomic and Molecular Emission Lines

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