Journal
JOURNAL OF PLASMA PHYSICS
Volume 81, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022377815000835
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Funding
- EPSRC [EP/J003832/1, EP/K022415/1]
- EURatom research and training programme [633053]
- LASERLAB-EUROPE (EC's Seventh Framework Programme) [284464]
- Engineering and Physical Sciences Research Council [EP/K022415/1, EP/J003832/1] Funding Source: researchfish
- Science and Technology Facilities Council [1482262] Funding Source: researchfish
- EPSRC [EP/J003832/1, EP/K022415/1] Funding Source: UKRI
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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 x 10(13) with an estimated total energy of 12 +/- 1 J from a 100 mu m Cu target with 140 J of incident laser energy during a 4 x 10(20) W cm(-2) interaction.
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