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Title: Implementation and assessment of an extended hydrogenic molecular model in UEDGE

Abstract

Abstract Two sets of pure deuterium plasmas are simulated using UEDGE, one including atoms and molecules and the other including atoms only as separate fluid species. Simulation results in one and two dimensions are reported to assess the role of molecules in tokamak plasmas. It is shown that thermal coupling of the molecules to the plasma can be relevant for the onset of detachment under highly collisional conditions in simple geometries, but play a modest role at low collisionality. Ion‐molecule equipartition presents an additional ion energy loss channel, dissipating ion energy that would otherwise heat the electrons by equipartition. The resulting reduced electron temperature increases the ion‐electron recombination by an order of magnitude as the plasma density is increased, yielding earlier and deeper detachment.

Authors:
 [1];  [2];  [2]
  1. Physics and Life Sciences Lawrence Livermore National Laboratory Livermore California USA, Department of Applied Physics Aalto University Espoo Finland
  2. Physics and Life Sciences Lawrence Livermore National Laboratory Livermore California USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1598909
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Contributions to Plasma Physics
Additional Journal Information:
Journal Name: Contributions to Plasma Physics Journal Volume: 60 Journal Issue: 5-6; Journal ID: ISSN 0863-1042
Publisher:
Wiley Blackwell (John Wiley & Sons)
Country of Publication:
Germany
Language:
English

Citation Formats

Holm, A., Rognlien, T. D., and Meyer, W. H. Implementation and assessment of an extended hydrogenic molecular model in UEDGE. Germany: N. p., 2020. Web. doi:10.1002/ctpp.201900150.
Holm, A., Rognlien, T. D., & Meyer, W. H. Implementation and assessment of an extended hydrogenic molecular model in UEDGE. Germany. https://doi.org/10.1002/ctpp.201900150
Holm, A., Rognlien, T. D., and Meyer, W. H. Tue . "Implementation and assessment of an extended hydrogenic molecular model in UEDGE". Germany. https://doi.org/10.1002/ctpp.201900150.
@article{osti_1598909,
title = {Implementation and assessment of an extended hydrogenic molecular model in UEDGE},
author = {Holm, A. and Rognlien, T. D. and Meyer, W. H.},
abstractNote = {Abstract Two sets of pure deuterium plasmas are simulated using UEDGE, one including atoms and molecules and the other including atoms only as separate fluid species. Simulation results in one and two dimensions are reported to assess the role of molecules in tokamak plasmas. It is shown that thermal coupling of the molecules to the plasma can be relevant for the onset of detachment under highly collisional conditions in simple geometries, but play a modest role at low collisionality. Ion‐molecule equipartition presents an additional ion energy loss channel, dissipating ion energy that would otherwise heat the electrons by equipartition. The resulting reduced electron temperature increases the ion‐electron recombination by an order of magnitude as the plasma density is increased, yielding earlier and deeper detachment.},
doi = {10.1002/ctpp.201900150},
journal = {Contributions to Plasma Physics},
number = 5-6,
volume = 60,
place = {Germany},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1002/ctpp.201900150

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Cited by: 3 works
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Works referenced in this record:

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