Modification of atomic physics rates due to nonlocal electron parallel heat transport in divertor plasmas

The effect of steep temperature gradients on the rate of ionization of atomic hydrogen is studied numerically with the electron kinetic code ‘FPI’ [Phys. Rev. Lett. 72 (1994) 1208]. A set of cross sections [‘Atomic and Plasma-Material Interaction data for fusion’. Supplement to the journal Nucl. Fus...

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Published inJournal of nuclear materials Vol. 337-339; pp. 246 - 250
Main Authors Allais, F., Matte, J.P., Alouani-Bibi, F., Kim, C.G., Stotler, D.P., Rognlien, T.D.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.03.2005
Subjects
Collisional radiative model
Divertor modelling
Kinetics effects
Parallel transport
UEDGE
52.55.Fa
T0100
52.25.Fi
52.25.Jm
Divertor modelling
Kinetics effects
52.55.Ff
Parallel transport
K0100
P0600
UEDGE
Collisional radiative model
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Summary:The effect of steep temperature gradients on the rate of ionization of atomic hydrogen is studied numerically with the electron kinetic code ‘FPI’ [Phys. Rev. Lett. 72 (1994) 1208]. A set of cross sections [‘Atomic and Plasma-Material Interaction data for fusion’. Supplement to the journal Nucl. Fusion 4 (1993)] has been used which gives the same rates of radiation, ionization and recombination as in the well known edge modeling codes ‘UEDGE’ and ‘DEGAS’ for Maxwellian electron energy distribution functions. For this purpose, 30 energy levels are included in the computation, as stepwise ionization is dominant. The enhancement of the ionization rate by non-Maxwellian effects in the colder part of the plasma is significant.
Bibliography:SourceType-Scholarly Journals-2
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ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2004.10.089