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Title: High energy conversion efficiency in laser-proton acceleration by controlling laser-energy deposition onto thin foil targets

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.
Authors:
 [1] ;  [2] ; ; ; ; ; ; ; ; ;  [3] ; ;  [1] ; ; ;  [4] ;  [5] ;  [6] ;  [7] ; more »;  [8] ; « less
  1. Department of Physics, SUPA, University of Strathclyde, Glasgow G4 0NG (United Kingdom)
  2. (United Kingdom)
  3. Central Laser Facility, STFC, Rutherford Appleton Laboratory, Didcot, Oxon OX11 0QX (United Kingdom)
  4. Institute of Plasma Physics and Laser Microfusion, 00-908 Warsaw (Poland)
  5. Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt (Germany)
  6. Dipartimento di Fisica G. Occhialini, Universita di Milano Bicocca, 20126 Milan (Italy)
  7. Laboratory for Laser Energetics, Fusion Science Center for Extreme States of Matter, University of Rochester, Rochester, New York 14623 (United States)
  8. Department of Electronics Engineering, Centre for Plasma Physics and Lasers, 73133 Chania, 74100 Rethymno, Crete (Greece)
Publication Date:
OSTI Identifier:
22293030
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 8; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ACCELERATION; DEPOSITION; EFFICIENCY; ELECTRONS; ENERGY ABSORPTION; ENERGY CONVERSION; LASER TARGETS; LASERS; MEV RANGE; PROTON BEAMS; PROTONS; PULSED IRRADIATION