Low energy proton beams from laser-generated plasma

L. Torrisi*, L. Giuffrida, D. Margarone, F. Caridi, F. Di Bartolo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Low energy proton beams are produced by ns pulsed Nd:Yag laser operating in repetition rate at intensities of the order of 1010 W/cm 2. Laser pulses interacting with thick and thin solid hydrogenated targets, placed in high vacuum, produce non-equilibrium plasmas with ion emission in backward and forward directions along the normal to the target surface. The ion emission is analyzed with time-of-flight techniques by using ion collectors and ion deflecting spectrometers. The spectra analysis permits the evaluation of the plasma temperature, density, proton energy and current, ion energy and charge state distributions. Special targets, based on thin polymers coupled to metals or to conducting nanostructures, induce high electric field in the plasma and confer high kinetic energy to the protons, up to about 200 eV. By using a post-acceleration system, placed along the target normal direction, it is possible to accelerate further the protons up to the energy depending on the applied acceleration voltage. The maximum proton energy of 30 keV, the current density of about10 nA/cm2 and the beam quality can be improved, as discussed.

Original languageEnglish
Pages (from-to)140-144
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Volume653
Issue number1
DOIs
Publication statusPublished - 11 Oct 2011
Externally publishedYes

Bibliographical note

Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.

Keywords

  • Doped polymers
  • Hydrogenated targets
  • Laser-generated plasma
  • Proton acceleration
  • Proton yield

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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