2016
DOI: 10.1016/j.mre.2015.11.001
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Non-Maxwellian electron distributions resulting from direct laser acceleration in near-critical plasmas

Abstract: The irradiation of few nm thick targets by a finite-contrast high-intensity short-pulse laser results in a strong pre-expansion of these targets at the arrival time of the main pulse. The targets decompress to near and lower than critical densities plasmas extending over few micrometers, i.e. multiple wavelengths. The interaction of the main pulse with such a highly localized but inhomogeneous target leads to the generation of a short channel and further self-focusing of the laser beam. Experiments at the GHOS… Show more

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Cited by 26 publications
(15 citation statements)
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“…Being the plasma collisionless and the dynamics of hot electron generation ultra-fast (∼ 10 − 100 fs), then the hot electron population does not have enough time to thermalize. Hence, in that case, the assumption of thermal equilibrium is unlikely to be accurate, as is also suggested by other works [22,23].…”
Section: Introductionmentioning
confidence: 80%
See 1 more Smart Citation
“…Being the plasma collisionless and the dynamics of hot electron generation ultra-fast (∼ 10 − 100 fs), then the hot electron population does not have enough time to thermalize. Hence, in that case, the assumption of thermal equilibrium is unlikely to be accurate, as is also suggested by other works [22,23].…”
Section: Introductionmentioning
confidence: 80%
“…In equation (22) the (normalized) maximum ion energy is written as the sum of two contributions: ϕ * − 1/ζ, which does not depend on α, and a combination of other terms that do depend on α. Among the latter, the term proportional to (1 + 2α) would vanish if all hot electrons were trapped (note that, at equilibrium, if all electrons were trapped, i.e.…”
Section: Consequences On Target Normal Sheath Accelerationmentioning
confidence: 99%
“…One of the possibilities to increase the electron beam charge above a nC level keeping the electron energy at a level of tens up to hundreds of MeV, is to use the advantage of relativistic laser interaction with plasmas of subcritical and near critical density (NCD) [21][22][23][24]. The critical electron density is defined as n m e 4 L cr 2 2 w p = ( ) / where m and e are the mass of electron at rest and its charge and L w is the laser frequency.…”
Section: Introductionmentioning
confidence: 99%
“…Proton (and heavy ion) cancer therapy equipment based on conventional accelerators, is installed at hospitals, usually has a large scale. In recent years, many theoretical simulation works on laser plasma acceleration have achieved encouraging results [3][4][5][6][7], which has stimulated proposals to use laser acceleration as a new and attractive technology for radiation therapy [8].…”
Section: Introductionmentioning
confidence: 99%