4. Selection of Mean Excitation Energies for Elements

Berger, Martina; Inokuti, Mitio; Anderson, Harold; Bichsel, H.; Dennis, J.A.; Powers, D.; Seltzer, S. M.; Turner, James

doi:10.1093/jicru/os19.2.15

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“…In addition, several sources list the mean excitation energy for neutral atoms, for instance Berger et al. (1984), which is used in estar (Berger et al. 2005).…”

Section: Generalized Collision Operator For Fast Electrons In a Plasmmentioning

confidence: 99%

“…In this work, the numerical values of I j for different ion species were obtained from Sauer et al (2015). In addition, several sources list the mean excitation energy for neutral atoms, for instance Berger et al (1984), which is used in ESTAR (Berger et al 2005). Equation (2.30) is valid for m e c 2 (γ − 1) I j , which is typically of the order of hundreds to thousands of eV.…”

Section: Inelastic Collisions With Bound Electronsmentioning

confidence: 99%

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Generalized collision operator for fast electrons interacting with partially ionized impurities

et al. 2018

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Accurate modelling of the interaction between fast electrons and partially ionized atoms is important for evaluating tokamak disruption mitigation schemes based on material injection. This requires accounting for the effect of screening of the impurity nuclei by the cloud of bound electrons. In this paper, we generalize the Fokker-Planck operator in a fully ionized plasma by accounting for the effect of screening. We detail the derivation of this generalized operator, and calculate the effective ion length-scales, which are needed in the components of the collision operator, for a number of ion species commonly appearing in fusion experiments. We show that for high electric fields, the secondary runaway growth rate can be substantially larger than in a fully ionized plasma with the same effective charge, although the growth rate is significantly reduced at near-critical electric fields. Furthermore, by comparison with the Boltzmann collision operator, we show that the Fokker-Planck formalism is accurate even for large impurity content. † Email address for correspondence: hesslow@chalmers.se

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“…In addition, several sources list the mean excitation energy for neutral atoms, for instance Berger et al. (1984), which is used in estar (Berger et al. 2005).…”

Section: Generalized Collision Operator For Fast Electrons In a Plasmmentioning

confidence: 99%

Section: Inelastic Collisions With Bound Electronsmentioning

confidence: 99%