Accelerating monoenergetic protons from ultrathin foils by flat-top laser pulses in the directed-Coulomb-explosion regime

We consider the effect of laser beam shaping on proton acceleration in the interaction of a tightly focused pulse with ultrathin double-layer solid targets in the regime of directed Coulomb explosion. In this regime, the heavy ions of the front layer are forced by the laser to expand predominantly i...

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Bibliographic Details
Published in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2008-08, Vol.78 (2 Pt 2), p.026412-026412, Article 026412
Main Authors: Bulanov, S S, Brantov, A, Bychenkov, V Yu, Chvykov, V, Kalinchenko, G, Matsuoka, T, Rousseau, P, Reed, S, Yanovsky, V, Litzenberg, D W, Krushelnick, K, Maksimchuk, A
Format: Article
Language:English
Subjects:
Computer Simulation
Electrons
Ions
Lasers
Models, Theoretical
Protons
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Summary:We consider the effect of laser beam shaping on proton acceleration in the interaction of a tightly focused pulse with ultrathin double-layer solid targets in the regime of directed Coulomb explosion. In this regime, the heavy ions of the front layer are forced by the laser to expand predominantly in the direction of the pulse propagation, forming a moving longitudinal charge separation electric field, thus increasing the effectiveness of acceleration of second-layer protons. The utilization of beam shaping, namely, the use of flat-top beams, leads to more efficient proton acceleration due to the increase of the longitudinal field.
ISSN:1539-3755
1550-2376
DOI:10.1103/physreve.78.026412