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X-ray spectroscopy observation of fast ions generation in plasma produced by short low-contrast laser pulse irradiation of solid targets

Published online by Cambridge University Press:  19 June 2007

A.YA. Faenov ,
A.I. Magunov ,
T.A. Pikuz ,
I. YU. Skobelev ,
S.V. Gasilov ,
S. Stagira ,
F. Calegari ,
M. Nisoli ,
S. de Silvestri  and
L. Poletto
...Show all authors
A.YA. Faenov
Affiliation:
Joint Institute for High Temperatures of Russian Academy of Sciences, Moscow, Russia
A.I. Magunov
Affiliation:
A.M. Prokhorov General Physics Institute of Russian Academy of Sciences, Moscow, Russia
T.A. Pikuz
Affiliation:
Joint Institute for High Temperatures of Russian Academy of Sciences, Moscow, Russia
I. YU. Skobelev
Affiliation:
Joint Institute for High Temperatures of Russian Academy of Sciences, Moscow, Russia
S.V. Gasilov
Affiliation:
Joint Institute for High Temperatures of Russian Academy of Sciences, Moscow, Russia
S. Stagira
Affiliation:
National Laboratory for Ultrafast and Ultraintense Optical Science - CNR - INFM, Department of Physics, Politecnico, Milano, Italy
F. Calegari
Affiliation:
National Laboratory for Ultrafast and Ultraintense Optical Science - CNR - INFM, Department of Physics, Politecnico, Milano, Italy
M. Nisoli
Affiliation:
National Laboratory for Ultrafast and Ultraintense Optical Science - CNR - INFM, Department of Physics, Politecnico, Milano, Italy
S. de Silvestri
Affiliation:
National Laboratory for Ultrafast and Ultraintense Optical Science - CNR - INFM, Department of Physics, Politecnico, Milano, Italy
L. Poletto
Affiliation:
Laboratory for Ultraviolet and X-Ray Optical Research - CNR - INFM, D.E.I. - Universita; di Padova, Padova, Italy
P. Villoresi
Affiliation:
Laboratory for Ultraviolet and X-Ray Optical Research - CNR - INFM, D.E.I. - Universita; di Padova, Padova, Italy
A.A. Andreev
Affiliation:
Institute for Laser Physics, S.I. Vavilov State Optical Institute, St.-Petersburg, Russia
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Abstract

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X-ray spectra of plasma produced by the interaction of Ti:Sa laser pulses (duration from 60 fs to 1 ps, and energy from 15 mJ to 128 mJ) with foil and solid Teflon and AL targets are investigated. It is shown experimentally and theoretically that the use of low contrast (10−2 – 10−4) short laser pulses, essentially promotes the conditions for generation of fast multi-charged ions. This effect is caused by self-focusing of the main laser pulse in a preplasma produced by intense laser prepulses. Modeling of the observed spectral line shape gives evidence of a considerable (about 3%) amount of multi-charged He-like F ions with energy E ∼ 1 MeV at rather low values of laser intensity IL ≈ 6 × 1016 W cm−2.

Keywords

Ion accelerationLaser beam self-focusingLaser-produced plasmaX-ray spectroscopy
Type
Research Article
Information
Laser and Particle Beams , Volume 25 , Issue 2 , June 2007 , pp. 267 - 275
Copyright
© 2007 Cambridge University Press