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**Harvard**

Hesslow, L., Embréus, O., Wilkie, G., Dubois, T., Papp, G. och Fülöp, T. (2017) *Fast-electron dynamics in the presence of weakly ionized impurities*.

** BibTeX **

@conference{

Hesslow2017,

author={Hesslow, Linnea and Embréus, Ola and Wilkie, George and Dubois, Timothy and Papp, Gergely and Fülöp, Tünde},

title={Fast-electron dynamics in the presence of weakly ionized impurities},

booktitle={Proceedings of 44th EPS Conference on Plasma Physics},

pages={O4.118},

abstract={Runaway electrons constitute a significant threat to tokamak experiments. To minimize the
risk of damage, it is crucial to understand the runaway-electron dynamics, which during runaway
mitigation can be heavily influenced by the interaction with partially ionized atoms. Experiments
have shown that mitigation via heavy-impurity injection is more effective than would
be expected from standard collisional theory, highlighting the need for more accurate kinetic
models. To achieve this, partial screening of the nuclei by the bound electrons must be taken
into account.
In this contribution, we analyze the dynamics of fast electrons in plasmas containing partially
ionized impurity atoms. A generalized collision operator is derived from first principles using
quantum-mechanical models. We obtain analytical expressions for the deflection and slowing-down
frequencies, and show that they are increased by more than an order of magnitude compared
to the results obtained with complete screening, already at sub-relativistic electron energies.
Moreover, we implement the generalized collision operator in the continuum kinetic equation
solver CODE and demonstrate that interaction with partially ionized atoms greatly
affects fast-electron dynamics by enhancing the rates of angular deflection and energy loss. This
has important implications, not only for the efficacy of mitigation strategies for runaway electrons
in tokamak devices, but also for example for energy loss during relativistic breakdown in
lightning discharges.},

year={2017},

}

** RefWorks **

RT Conference Proceedings

SR Electronic

ID 250085

A1 Hesslow, Linnea

A1 Embréus, Ola

A1 Wilkie, George

A1 Dubois, Timothy

A1 Papp, Gergely

A1 Fülöp, Tünde

T1 Fast-electron dynamics in the presence of weakly ionized impurities

YR 2017

T2 Proceedings of 44th EPS Conference on Plasma Physics

AB Runaway electrons constitute a significant threat to tokamak experiments. To minimize the
risk of damage, it is crucial to understand the runaway-electron dynamics, which during runaway
mitigation can be heavily influenced by the interaction with partially ionized atoms. Experiments
have shown that mitigation via heavy-impurity injection is more effective than would
be expected from standard collisional theory, highlighting the need for more accurate kinetic
models. To achieve this, partial screening of the nuclei by the bound electrons must be taken
into account.
In this contribution, we analyze the dynamics of fast electrons in plasmas containing partially
ionized impurity atoms. A generalized collision operator is derived from first principles using
quantum-mechanical models. We obtain analytical expressions for the deflection and slowing-down
frequencies, and show that they are increased by more than an order of magnitude compared
to the results obtained with complete screening, already at sub-relativistic electron energies.
Moreover, we implement the generalized collision operator in the continuum kinetic equation
solver CODE and demonstrate that interaction with partially ionized atoms greatly
affects fast-electron dynamics by enhancing the rates of angular deflection and energy loss. This
has important implications, not only for the efficacy of mitigation strategies for runaway electrons
in tokamak devices, but also for example for energy loss during relativistic breakdown in
lightning discharges.

LA eng

LK http://ocs.ciemat.es/EPS2017ABS/pdf/O4.118.pdf

OL 30