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Physics of Plasmas / Volume 14 / Issue 5 / ARTICLES / Lasers, Particle Beams, Accelerators, Radiation Generation

Phys. Plasmas 14, 053105 (2007); doi:10.1063/1.2720373 (13 pages)

Comparative spectra and efficiencies of ions laser-accelerated forward from the front and rear surfaces of thin solid foils

J. Fuchs1,2,3, Y. Sentoku1,3, E. d’Humières2,3, T. E. Cowan1,3, J. Cobble4, P. Audebert2, A. Kemp1,3, A. Nikroo1, P. Antici2, E. Brambrink2,5, A. Blazevic5, E. M. Campbell1, J. C. Fernández4, J.-C. Gauthier2, M. Geissel5, M. Hegelich4,6, S. Karsch6, H. Popescu2, N. Renard-LeGalloudec3, M. Roth5, J. Schreiber6, R. Stephens1, and H. Pépin2,7

1General Atomics, San Diego, California 92121
2LULI, École Polytechnique, CNRS-CEA, UPMC, route de Saclay, 91128 Palaiseau, France
3Physics Department, MS-220, University of Nevada, Reno, Nevada 89557
4University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
5Technische Universitat Darmstadt, 64289 Darmstadt, Germany
6Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
7INRS-EMT, 1650 bd. L. Boulet, Varennes, Québec J3X 1S2, Canada

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(Received 30 November 2006; accepted 5 March 2007; published online 17 May 2007)

The maximum energy of protons that are accelerated forward by high-intensity, short-pulse lasers from either the front or rear surfaces of thin metal foils is compared for a large range of laser intensities and pulse durations. In the regime of moderately long laser pulse durations (300–850 fs), and for high laser intensities [(1−6)×1019 W/cm2], rear-surface acceleration is shown experimentally to produce higher energy particles with smaller divergence and a higher efficiency than front-surface acceleration. For similar laser pulse durations but for lower laser intensities (2×1018 W cm−2), the same conclusion is reached from direct proton radiography of the electric fields associated with proton acceleration from the rear surface. For shorter (30–100 fs) or longer (1–10 ps) laser pulses, the same predominance of rear-surface acceleration in producing the highest energy protons is suggested by simulations and by comparison of analytical models with measured values. For this purpose, we have revised our previous analytical model of rear-surface acceleration [ J. Fuchs et al., Nat. Phys. 2, 48 (2006) ] to adapt it to the very short pulse durations. Finally, it appears, for the explored parameters, that rear-surface acceleration is the dominant mechanism.

© 2007 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SETUP
  3. SETUP OF TWO-DIMENSIONAL PIC SIMULATION
  4. RESULTS
    1. Direct beam observations
    2. Nuclear activation measurements
    3. Proton radiograph of the electric fields associated with proton acceleration
  5. GENERAL DISCUSSION REGARDING RSA VERSUS FSA
  6. CONCLUSION

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KEYWORDS and PACS

Keywords

optical self-focusing, high-speed optical techniques, plasma light propagation, plasma transport processes, plasma simulation, refractive index

PACS

  • 52.38.Kd

    Laser-plasma acceleration of electrons and ions

  • 07.77.Ka

    Charged-particle beam sources and detectors

  • 52.70.Nc

    Particle measurements

  • 24.10.Lx

    Monte Carlo simulations (including hadron and parton cascades and string breaking models)

ARTICLE DATA

Permalink
http://link.aip.org/link/doi/10.1063/1.2720373

PUBLICATION DATA

ISSN:

1070-664X (print)  
1089-7674 (online)

Publisher:

$abstract.society.value is a Member of CrossRef American Institute of Physics

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