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Protons and ion acceleration from thick targets at 1010 W/cm2 laser pulse intensity

Published online by Cambridge University Press:  22 December 2010

L. Torrisi ,
F. Caridi  and
L. Giuffrida
L. Torrisi
Affiliation:
Dipartimento di Fisica, Messina, Italy and INFN-Laboratori Nazionali del Sud, Catania, Italy
F. Caridi*
Affiliation:
Facoltà di Scienze MM.FF.NN., Università di Messina, Messina, Italy and INFN-Sez. CT, Gruppo collegato di Messina, Messina, Italy
L. Giuffrida
Affiliation:
Dipartimento di Fisica, Messina, Italy and INFN-Laboratori Nazionali del Sud, Catania, Italy
*
Address correspondence and reprint requests to: Francesco Caridi, Facoltà di Scienze MM.FF.NN., Università di Messina, Ctr. Papardo 31, 98166, Messina, Italy. E-mail: fcaridi@unime.it
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Abstract

Proton ion acceleration via laser-generated plasma is investigated at relatively low laser pulse intensity, on the order of 1010 W/cm2. Time-of-flight technique is employed to measure the ion energy and the relative yield. An ion collector and an ion energy analyzer are used with this aim and to distinguish the number of charge states of the produced ions. The kinetic energy and the emission yield are measured through a consolidated theory, which assumes that the ion emission follows the Coulomb-Boltzmann-Shifted function. The proton stream is generated by thin and thick hydrogenated targets and it is dependent on the free electron states, which increase the laser absorption coefficient and the ion acceleration. The maximum proton energy, of about 200 eV, and the maximum proton amount can be obtained with thick metallic hydrogenated materials, such as the titanium hydrate TiH2.

Keywords

Coulomb-Boltzmann-shifted distributionLaser-generated plasmaMetal ablationPolymer ablation
Type
Research Article
Information
Laser and Particle Beams , Volume 29 , Issue 1 , March 2011 , pp. 29 - 37
Copyright
Copyright © Cambridge University Press 2010

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References

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