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Mermin dielectric function versus local field corrections on proton stopping in degenerate plasmas

Published online by Cambridge University Press:  07 July 2008

M.D. Barriga-Carrasco
M.D. Barriga-Carrasco*
Affiliation:
E.T.S.I. Industriales, Universidad de Castilla-La Mancha, Ciudad Real, Spain
*
Address correspondence and reprint requests to: Manuel D. Barriga-Carrasco, E.T.S.I. Industriales, Universidad de Castilla-La Mancha, E-13071 Ciudad Real, Spain. E-mail: [email protected]
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Abstract

If plasmas are considered fully ionized, the electronic stopping of a charged particle that traverses them will only be due to free electrons. This stopping can be obtained in a first view through the random phase approximation (RPA). But free electrons interact between them affecting the stopping. These interactions can be taken into account in the dielectric formalism by means of two different ways: the Mermin function or the local field corrections (LFCs). LFCs produce an enhancement in stopping before the maximum and recover the RPA values just after it. Mermin method also produces firstly a high increase at very low energies, then a small enhancement at low energies and finally decreases below RPA values before and after the maximum. Differences between the two methods are very important at very low energies and by 30% around the stopping maximum.

Keywords

Electron collisionsEnergy lossFast ignitionLocal field correction
Type
Research Article
Information
Laser and Particle Beams , Volume 26 , Issue 3 , September 2008 , pp. 389 - 395
Copyright
Copyright © Cambridge University Press 2008

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