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Stopping power of a helium plasma under LTE or NLTE conditions

Published online by Cambridge University Press:  13 September 2018

Luis González-Gallego ,
Manuel D. Barriga-Carrasco ,
Juan Miguel Gil ,
Rafael Rodríguez  and
Guadalupe Espinosa
Luis González-Gallego
Affiliation:
E.T.S.I. Industriales, Universidad de Castilla-La Mancha, E-13071 Ciudad Real, Spain
Manuel D. Barriga-Carrasco*
Affiliation:
E.T.S.I. Industriales, Universidad de Castilla-La Mancha, E-13071 Ciudad Real, Spain
Juan Miguel Gil
Affiliation:
Departamento de Física, Universidad de las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
Rafael Rodríguez
Affiliation:
Departamento de Física, Universidad de las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
Guadalupe Espinosa
Affiliation:
Departamento de Física, Universidad de las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
*
Author for correspondence: Manuel D. Barriga-Carrasco, E.T.S.I. Industriales, Universidad de Castilla-La Mancha, E-13071 Ciudad Real, Spain, E-mail: ManuelD.Barriga@uclm.es
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Abstract

In this work, the stopping power of a partially ionized helium plasma due to its free and bound electrons is analyzed for an electron temperature and density in which local thermal equilibrium (LTE) or non-local thermal equilibrium (NLTE) regimes can be possible. In particular by means of collisional-radiative models, the average ionization of the plasma as well as the abundances of different helium species (HeI, HeII, and HeIII) are analyzed in both LTE and NLTE thermodynamic states. The influence of this ionization and of the different ion abundances on the stopping power of the helium plasma is shown to be quite significant. Finally, our theoretical model is compared with experimental results on slowing down of swift argon ions in helium plasma.

Keywords

Bound electronsenergy lossfree electronshelium plasmaLTE and NLTE plasmaspartially ionized plasmasparticle beam interactions in plasmastopping power
Type
Research Article
Information
Laser and Particle Beams , Volume 36 , Issue 4 , December 2018 , pp. 442 - 447
Copyright
Copyright © Cambridge University Press 2018 

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