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Laser acceleration of monoenergetic protons via a double layer emerging from an ultra-thin foil
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- Eliasson, Bengt (author)
- Umeå universitet,Institutionen för fysik,Institut für Theoretische Physik IV, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany
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- Liu, Chuan S. (author)
- Department of Physics, University of Maryland
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- Shao, Xi (author)
- Department of Physics, University of Maryland
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- (creator_code:org_t)
- 2009-07-03
- 2009
- English.
- In: New Journal of Physics. - : IOP Publishing Ltd and Deutsche Physikalische Gesellschaft. - 1367-2630. ; 11, s. 073006-073025
- Journal article (peer-reviewed)
Abstract
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- We present theoretical and numerical studies of the acceleration of monoenergetic protons in a double layer formed by the laser irradiation of an ultra-thin film. The ponderomotive force of the laser light pushes the electrons forward, and the induced space charge electric field pulls the ions and makes the thin foil accelerate as a whole. The ions trapped by the combined electric field and inertial force in the accelerated frame, together with the electrons trapped in the well of the ponderomotive and ion electric field, form a stable double layer. The trapped ions are accelerated to monoenergetic energies up to 100 MeV and beyond, making them suitable for cancer treatment. We present an analytic theory for the laser-accelerated ion energy and for the amount of trapped ions as functions of the laser intensity, foil thickness and the plasma number density. We also discuss the underlying physics of the trapped and untrapped ions in a double layer. The analytical results are compared with those obtained from direct Vlasov simulations of the fully nonlinear electron and ion dynamics that is controlled by the laser light.
Subject headings
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
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- art (subject category)
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