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Optimization of laser acceleration of protons from mixed structure nanotarget

Published online by Cambridge University Press:  20 May 2015

Saeed Mirzanejhad ,
Farshad Sohbatzadeh ,
Atefeh Joulaei ,
Javad Babaei  and
Khadijeh Shahabei
Saeed Mirzanejhad*
Affiliation:
Faculty of Basic Science, Atomic and Molecular Physics Department, University of Mazandaran, Babolsar, Iran
Farshad Sohbatzadeh
Affiliation:
Faculty of Basic Science, Atomic and Molecular Physics Department, University of Mazandaran, Babolsar, Iran
Atefeh Joulaei
Affiliation:
Faculty of Basic Science, Atomic and Molecular Physics Department, University of Mazandaran, Babolsar, Iran
Javad Babaei
Affiliation:
Faculty of Basic Science, Atomic and Molecular Physics Department, University of Mazandaran, Babolsar, Iran
Khadijeh Shahabei
Affiliation:
Faculty of Basic Science, Atomic and Molecular Physics Department, University of Mazandaran, Babolsar, Iran
*
Address correspondence and reprint requests to: Saeed Mirzanejhad, Faculty of basic science, Atomic and Molecular Physics Department, University of Mazandaran, P. O. Box 47415-416, Babolsar, Iran. E-mail: [email protected]
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Abstract

In this study, ion acceleration from thin planar diamond-like carbon (DLC) and polystyrene (PS) foils irradiated by ultraintense (a0 = 200) and ultrashort (15 fs) laser pulses is investigated numerically. The effects of target composition and thickness on the acceleration of protons and carbon ions are reported by 1D3V particle-in-cell simulation code and compared with the analytical models of ion acceleration. In the analytical formalism, the acceleration criterion of ions with different charge-to-mass ratio (q/m) is obtained. This criterion is related to the potential difference through the electrostatic shock distortion and its velocity. According to this result, charged particles with large q/m ratio have a good chance to accelerate in front of the electrostatic shock field. It is shown that mono-energetic proton bunch with energies >1.5 GeV is produced by 20 nm DLC foil supported by 10 nm hydrogen layer. Finally nanometer PS foil is examined and 2.33 Gev protons with ~1.5% energy spread are obtained for 50 nm thickness.

Keywords

Laser–foil interactionLaser acceleration of electrons and ionsParticle-in-cell simulation
Type
Research Article
Information
Laser and Particle Beams , Volume 33 , Issue 2 , June 2015 , pp. 339 - 346
Copyright
Copyright © Cambridge University Press 2015 

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