Collisionless absorption in sharp-edged plasmas

Paul Gibbon and A. R. Bell
Phys. Rev. Lett. 68, 1535 – Published 9 March 1992
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Abstract

The absorption of subpicosecond, obliquely incident laser light is studied using a 11/2D particle-in-cell code. Density scale lengths from L/λ=0.01 to 2 and laser irradiances between Iλ2=1014 and 1018 W cm2 μm2 are considered. ‘‘Vacuum heating’’ [F. Brunel, Phys. Rev. Lett. 59, 52 (1987)] dominates over resonance absorption for scale lengths L/λ<0.1, and is most efficient when vosc/c≃3.1(L)2. Absorbed energy is carried mainly by a ‘‘superhot’’ electron population with Uhot∼(Iλ2)1/31/2.

  • Received 2 July 1991

DOI:https://doi.org/10.1103/PhysRevLett.68.1535

©1992 American Physical Society

Authors & Affiliations

Paul Gibbon

  • Max-Planck-Institut für Biophysikalische Chemie, D-3400 Göttingen-Nikolausberg, Germany

A. R. Bell

  • The Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2BZ, England

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Issue

Vol. 68, Iss. 10 — 9 March 1992

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