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Effects of front surface plasma expansion on proton acceleration in ultraintense laser irradiation of foil targets

  • P. McKenna (a1), D.C. Carroll (a1), O. Lundh (a2), F. Nürnberg (a3), K. Markey (a4), S. Bandyopadhyay (a5), D. Batani (a6), R.G. Evans (a7), R. Jafer (a6), S. Kar (a4), D. Neely (a5), D. Pepler (a5), M.N. Quinn (a1), R. Redaelli (a6), M. Roth (a3), C.-G. Wahlström (a2), X.H. Yuan (a1) and M. Zepf (a4)...

Abstract

The properties of beams of high energy protons accelerated during ultraintense, picosecond laser-irradiation of thin foil targets are investigated as a function of preplasma expansion at the target front surface. Significant enhancement in the maximum proton energy and laser-to-proton energy conversion efficiency is observed at optimum preplasma density gradients, due to self-focusing of the incident laser pulse. For very long preplasma expansion, the propagating laser pulse is observed to filament, resulting in highly uniform proton beams, but with reduced flux and maximum energy.

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Corresponding author

Address correspondence and reprint requests to: Paul McKenna, SUPA, Department of Physics, University of Strathclyde, Glasgow G4 0NG, United Kingdom. E-mail: p.mckenna@phys.strath.ac.uk

References

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