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- Title
Measurement of the angle, temperature and flux of fast electrons emitted from intense laser–solid interactions.
- Authors
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.
- 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 a target-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 $2.6\times 10^{13}$ with an estimated total energy of $12\pm 1~\text{J}$ from a $100~{\rm\mu}\text{m}$ Cu target with 140 J of incident laser energy during a $4\times 10^{20}~\text{W}~\text{cm}^{-2}$ interaction.
- Subjects
PLASMA lasers; PLASMA interactions; TEMPERATURE effect; RELATIVISTIC electron beams; PROTONS
- Publication
Journal of Plasma Physics, 2015, Vol 81, Issue 5, pN.PAG
- ISSN
0022-3778
- Publication type
Article
- DOI
10.1017/S0022377815000835