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The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

Strathprints serves world leading Open Access research by the University of Strathclyde, including research by the Strathclyde Institute of Pharmacy and Biomedical Sciences (SIPBS), where research centres such as the Industrial Biotechnology Innovation Centre (IBioIC), the Cancer Research UK Formulation Unit, SeaBioTech and the Centre for Biophotonics are based.

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Spectral enhancement in the double pulse regime of laser proton acceleration

Markey, K. and McKenna, P. and Brenner, C. M. and Carroll, D. C. and Günther, M.M. and Harres, K. and Kar, S. and Lancaster, K. and Nürnberg, F. and Quinn, M. N. and Robinson, A. P. L. and Roth, M. and Zepf, M. and Neely, D. (2010) Spectral enhancement in the double pulse regime of laser proton acceleration. Physical Review Letters, 105 (19). ISSN 0031-9007

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Abstract

The use of two separate ultraintense laser pulses in laser-proton acceleration was compared to the single pulse case employing the same total laser energy. A double pulse profile, with the temporal separation of the pulses varied between 0.75-2.5 ps, was shown to result in an increased maximum proton energy and an increase in conversion efficiency to fast protons by up to a factor of 3.3. Particle-in-cell simulations indicate the existence of a two stage acceleration process. The second phase, induced by the main pulse preferentially accelerates slower protons located deeper in the plasma, in contrast to conventional target normal sheath acceleration.