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Persistent URL http://purl.org/net/epubs/work/11846074
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Record Id 11846074
Title High energy conversion efficiency in laser-proton acceleration by controlling laser-energy deposition onto thin foil targets
Abstract An all-optical approach to laser-proton acceleration enhancement is investigated using the simplest of target designs to demonstrate application-relevant levels of energy conversion efficiency between laser and protons. Controlled deposition of laser energy, in the form of a double-pulse temporal envelope, is investigated in combination with thin foil targets in which recirculation of laser-accelerated electrons can lead to optimal conditions for coupling laser drive energy into the proton beam. This approach is shown to deliver a substantial enhancement in the coupling of laser energy to 5–30 MeV protons, compared to single pulse irradiation, reaching a record high 15% conversion efficiency with a temporal separation of 1 ps between the two pulses and a 5 μm-thick Au foil. A 1D simulation code is used to support and explain the origin of the observation of an optimum pulse separation of ∼1 ps.
Organisation CLF , CI , STFC
Funding Information EPSRC (EP/J003832/1); EPSRC (EP/K022415/1); EC, Framework Programme 7: LASERLAB-EUROPE (284464)
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Language English (EN)
Type Details URI(s) Local file(s) Year
Journal Article Appl Phys Lett 104, no. 8 (2014): 081123. doi:10.1063/1.4865812 2014
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