Home > Research > Publications & Outputs > Buffered high charge spectrally-peaked proton b...

Links

Text available via DOI:

View graph of relations

Buffered high charge spectrally-peaked proton beams in the relativistic-transparency regime

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
  • N. P. Dover
  • H. Ahmed
  • B. Albertazzi
  • M. Borghesi
  • D. C. Carroll
  • J. Fuchs
  • R. Heathcote
  • P. Hilz
  • K. F. Kakolee
  • S. Kar
  • R. Kodama
  • A. Kon
  • D. A. MacLellan
  • P. McKenna
  • S. R. Nagel
  • D. Neely
  • M. M. Notley
  • M. Nakatsutsumi
  • R. Prasad
  • G. Scott
  • M. Tampo
  • M. Zepf
  • J. Schreiber
  • Z. Najmudin
Close
Article number013038
<mark>Journal publication date</mark>18/01/2016
<mark>Journal</mark>New Journal of Physics
Volume18
Number of pages8
Publication StatusPublished
<mark>Original language</mark>English

Abstract

Spectrally-peaked proton beams of high charge (E-p approximate to 8 MeV, Delta E approximate to 4 MeV, N approximate to 50 nC) have been observed from the interaction of an intense laser (> 10(19) W cm(-2)) with ultrathin CH foils, as measured by spectrally-resolved full beam profiles. These beams are reproducibly generated for foil thicknesses 5-100 nm, and exhibit narrowing divergence with decreasing target thickness down to approximate to 8 degrees for 5 nm. Simulations demonstrate that the narrow energy spread feature is a result of buffered acceleration of protons. The radiation pressure at the front of the target results in asymmetric sheath fields which permeate throughout the target, causing preferential forward acceleration. Due to their higher charge-to-mass ratio, the protons outrun a carbon plasma driven in the relativistic transparency regime.