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Title: Enhanced proton beams from ultrathin targets driven by high contrast laser pulses

Abstract

The generation of proton beams from ultrathin targets, down to 20 nm in thickness, driven with ultrahigh contrast laser pulses is explored. The conversion efficiency from laser energy into protons increases as the foil thickness is decreased, with good beam quality and high efficiencies of 1% being achieved, for protons with kinetic energy exceeding 0.9 MeV, for 100 nm thick aluminum foils at intensities of 10{sup 19} W/cm{sup 2} with 33 fs, 0.3 J pulses. To minimize amplified spontaneous emission (ASE) induced effects disrupting the acceleration mechanism, exceptional laser to ASE intensity contrasts of up to 10{sup 10} are achieved by introducing a plasma mirror to the high contrast 10 Hz multiterawatt laser at the Lund Laser Centre. It is shown that for a given laser energy on target, regimes of higher laser-to-proton energy conversion efficiency can be accessed with increasing contrast. The increasing efficiency as the target thickness decreases is closely correlated to an increasing proton temperature.

Authors:
; ; ; ; ; ; ;  [1]
  1. Central Laser Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX (United Kingdom)
Publication Date:
OSTI Identifier:
20860544
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 89; Journal Issue: 2; Other Information: DOI: 10.1063/1.2220011; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM; EFFICIENCY; ENERGY CONVERSION; FOILS; KEV RANGE 100-1000; KINETIC ENERGY; LASERS; LIGHT TRANSMISSION; PLASMA; PLASMA HEATING; PROTON BEAMS; PROTON TEMPERATURE; PROTONS; PULSES; SUPERRADIANCE; THICKNESS

Citation Formats

Neely, D, Foster, P, Robinson, A, Lindau, F, Lundh, O, Persson, A, Wahlstroem, C -G, McKenna, P, Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, and SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG. Enhanced proton beams from ultrathin targets driven by high contrast laser pulses. United States: N. p., 2006. Web. doi:10.1063/1.2220011.
Neely, D, Foster, P, Robinson, A, Lindau, F, Lundh, O, Persson, A, Wahlstroem, C -G, McKenna, P, Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, & SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG. Enhanced proton beams from ultrathin targets driven by high contrast laser pulses. United States. https://doi.org/10.1063/1.2220011
Neely, D, Foster, P, Robinson, A, Lindau, F, Lundh, O, Persson, A, Wahlstroem, C -G, McKenna, P, Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, and SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG. 2006. "Enhanced proton beams from ultrathin targets driven by high contrast laser pulses". United States. https://doi.org/10.1063/1.2220011.
@article{osti_20860544,
title = {Enhanced proton beams from ultrathin targets driven by high contrast laser pulses},
author = {Neely, D and Foster, P and Robinson, A and Lindau, F and Lundh, O and Persson, A and Wahlstroem, C -G and McKenna, P and Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund and SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG},
abstractNote = {The generation of proton beams from ultrathin targets, down to 20 nm in thickness, driven with ultrahigh contrast laser pulses is explored. The conversion efficiency from laser energy into protons increases as the foil thickness is decreased, with good beam quality and high efficiencies of 1% being achieved, for protons with kinetic energy exceeding 0.9 MeV, for 100 nm thick aluminum foils at intensities of 10{sup 19} W/cm{sup 2} with 33 fs, 0.3 J pulses. To minimize amplified spontaneous emission (ASE) induced effects disrupting the acceleration mechanism, exceptional laser to ASE intensity contrasts of up to 10{sup 10} are achieved by introducing a plasma mirror to the high contrast 10 Hz multiterawatt laser at the Lund Laser Centre. It is shown that for a given laser energy on target, regimes of higher laser-to-proton energy conversion efficiency can be accessed with increasing contrast. The increasing efficiency as the target thickness decreases is closely correlated to an increasing proton temperature.},
doi = {10.1063/1.2220011},
url = {https://www.osti.gov/biblio/20860544}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 2,
volume = 89,
place = {United States},
year = {2006},
month = {7}
}