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Title: Mechanism of heating of pre-formed plasma electrons in relativistic laser-matter interaction

Abstract

The role of the longitudinal ambipolar electric field, present inside a pre-formed plasma, in electron heating and beam generation is investigated by analyzing single electron motion in the presence of one electromagnetic plane wave and 'V' shaped potential well (constant electric field) in a one dimensional slab approximation. It is shown that for the electron confined in an infinite potential well, its motion becomes stochastic when the ratio of normalized laser electric field a{sub 0}, to normalized longitudinal electric field E{sub z}, exceeds unity, i.e., a{sub 0}/E{sub z} Greater-Than-Or-Equivalent-To 1. For a more realistic potential well of finite depth, present inside the pre-formed plasma, the condition for stochastic heating of electrons gets modified to 1 Less-Than-Or-Equivalent-To a{sub 0}/E{sub z} Less-Than-Or-Equivalent-To {radical}(L), where L is the normalized length of the potential well. The energy of electron beam leaving such a potential well and entering the solid scales {approx}a{sub 0}{sup 2}/E{sub z}, which can exceed the laser ponderomotive energy ({approx}a{sub 0}) in the stochastic regime.

Authors:
; ;  [1]
  1. University of California-San Diego, La Jolla, California 92093 (United States)
Publication Date:
OSTI Identifier:
22072439
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 19; Journal Issue: 6; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 43 PARTICLE ACCELERATORS; ELECTRIC FIELDS; ELECTRON BEAMS; INTERACTIONS; LASERS; ONE-DIMENSIONAL CALCULATIONS; PLASMA; PONDEROMOTIVE FORCE; POTENTIALS; RELATIVISTIC RANGE; SLABS; STOCHASTIC PROCESSES; WAVE PROPAGATION

Citation Formats

Paradkar, B. S., Krasheninnikov, S. I., and Beg, F. N. Mechanism of heating of pre-formed plasma electrons in relativistic laser-matter interaction. United States: N. p., 2012. Web. doi:10.1063/1.4731731.
Paradkar, B. S., Krasheninnikov, S. I., & Beg, F. N. Mechanism of heating of pre-formed plasma electrons in relativistic laser-matter interaction. United States. doi:10.1063/1.4731731.
Paradkar, B. S., Krasheninnikov, S. I., and Beg, F. N. Fri . "Mechanism of heating of pre-formed plasma electrons in relativistic laser-matter interaction". United States. doi:10.1063/1.4731731.
@article{osti_22072439,
title = {Mechanism of heating of pre-formed plasma electrons in relativistic laser-matter interaction},
author = {Paradkar, B. S. and Krasheninnikov, S. I. and Beg, F. N.},
abstractNote = {The role of the longitudinal ambipolar electric field, present inside a pre-formed plasma, in electron heating and beam generation is investigated by analyzing single electron motion in the presence of one electromagnetic plane wave and 'V' shaped potential well (constant electric field) in a one dimensional slab approximation. It is shown that for the electron confined in an infinite potential well, its motion becomes stochastic when the ratio of normalized laser electric field a{sub 0}, to normalized longitudinal electric field E{sub z}, exceeds unity, i.e., a{sub 0}/E{sub z} Greater-Than-Or-Equivalent-To 1. For a more realistic potential well of finite depth, present inside the pre-formed plasma, the condition for stochastic heating of electrons gets modified to 1 Less-Than-Or-Equivalent-To a{sub 0}/E{sub z} Less-Than-Or-Equivalent-To {radical}(L), where L is the normalized length of the potential well. The energy of electron beam leaving such a potential well and entering the solid scales {approx}a{sub 0}{sup 2}/E{sub z}, which can exceed the laser ponderomotive energy ({approx}a{sub 0}) in the stochastic regime.},
doi = {10.1063/1.4731731},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 6,
volume = 19,
place = {United States},
year = {2012},
month = {6}
}