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Ion acceleration by short high intensity laser pulse in small target sets

Published online by Cambridge University Press:  29 June 2009

A. Andreev ,
K. Platonov  and
S. Kawata
A. Andreev*
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan SIC, Vavilov State Optical Institute, St. Petersburg, Russia
K. Platonov
Affiliation:
SIC, Vavilov State Optical Institute, St. Petersburg, Russia
S. Kawata
Affiliation:
Graduate School of Engineering, Utsunomiya University, Utsunomiya, Japan
*
Address correspondence and reprint requests to: A. Andreev, Vavilov State Optical Institute, 12 Birzhevaya line, St. Petersburg, 199064, Russia. E-mail: [email protected]
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Abstract

Ion acceleration by short, high intensity laser pulses in sets of small targets is treated by an analytical model developed here, and by two-dimensional particle-in-cell simulations. When an intense short laser pulse illuminates a thin foil target at normal incidence, electrons in the target are accelerated by the ponderomotive force. At the rear surface of the foil they generate a strong electric field that accelerates the ions, and generates an ion beam of small divergence. Using a mass-limited small target like a droplet enhances the ion energy, but increases divergence at the same time. In this paper, a combination of several-micron targets in a periodic structure (for example, a droplet chain) is proposed in order to increase the conversion efficiency from the incident laser beam to the emergent protons. Improvement of the energy flux conversion efficiency from the laser to the ion beam at optimal conditions is demonstrated.

Keywords

Ion accelerationLaser plasmaMass limited targetsShort intense laser pulse
Type
Research Article
Information
Laser and Particle Beams , Volume 27 , Issue 3 , September 2009 , pp. 449 - 457
Copyright
Copyright © Cambridge University Press 2009

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