Measurement of the angle, temperature and flux of fast electrons emitted from intense laser-solid interactions

D. R. Rusby, L. A. Wilson, R. J. Gray, R. J. Dance, N. M H Butler, D. A. MacLellan, G. G. Scott, V. Bagnoud, B. Zielbauer, P. McKenna, D. Neely

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

High-intensity laser-solid interactions generate relativistic electrons, as well as high-energy (multi-MeV) ions and X-rays. The directionality, spectra and total number of electrons that escape atarget-foil is dependent on the absorption, transport and rear-side sheath conditions. Measuring the electrons escaping the target will aid in improving our understanding of these absorption processes and the rear-surface sheath fields that retard the escaping electrons and accelerate ions via the target normal sheath acceleration (TNSA) mechanism. A comprehensive Geant4 study was performed to help analyse measurements made with a wrap-around diagnostic that surrounds the target and uses differential filtering with a FUJI-film image plate detector. The contribution of secondary sources such as X-rays and protons to the measured signal have been taken into account to aid in the retrieval of the electron signal. Angular and spectral data from a high-intensity laser-solid interaction are presented and accompanied by simulations. The total number of emitted electrons has been measured as 2.6 × 1013 with an estimated total energy of 12 ± 1 J from a 100 mu;m Cu target with140 J of incident laser energy during a 4 × 1020 W cm-2 interaction.

LanguageEnglish
Article number475810505
Number of pages9
JournalJournal of Plasma Physics
Volume81
Issue number5
Early online date13 Jul 2015
DOIs
Publication statusPublished - 1 Oct 2015

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sheaths
lasers
electrons
interactions
high power lasers
temperature
wrap
escape
retrieval
energy
foils
ions
x rays
protons
detectors
simulation

Keywords

  • relativistic electrons
  • laser–solid interaction
  • high-energy ions
  • laser energy

Cite this

Rusby, D. R. ; Wilson, L. A. ; Gray, R. J. ; Dance, R. J. ; Butler, N. M H ; MacLellan, D. A. ; Scott, G. G. ; Bagnoud, V. ; Zielbauer, B. ; McKenna, P. ; Neely, D. / Measurement of the angle, temperature and flux of fast electrons emitted from intense laser-solid interactions. In: Journal of Plasma Physics. 2015 ; Vol. 81, No. 5.
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Measurement of the angle, temperature and flux of fast electrons emitted from intense laser-solid interactions. / Rusby, D. R.; Wilson, L. A.; Gray, R. J.; Dance, R. J.; Butler, N. M H; MacLellan, D. A.; Scott, G. G.; Bagnoud, V.; Zielbauer, B.; McKenna, P.; Neely, D.

In: Journal of Plasma Physics, Vol. 81, No. 5, 475810505, 01.10.2015.

Research output: Contribution to journalArticle

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