Effects of laser prepulse on proton generation

Batani, D. and Jafer, R. and Redaelli, R. and Dezulian, R. and Lundh, O. and Lindau, F. and Persson, A. and Osvay, K. and Wahlstrom, C.-G. and Carroll, D. C. and McKenna, P. (2010) Effects of laser prepulse on proton generation. Radiation Effects and Defects in Solids, 165 (6-10). pp. 794-802. ISSN 1042-0150 (https://doi.org/10.1080/10420151003732064)

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Prepulse is a major issue for laser generation of protons, often limiting the performances of laser sources. Here, we show the use of prepulse (1013W/cm2, ns duration) to actively manipulate the proton beam direction. Under oblique high-intensity irradiation (approximate to 1019W/cm2, ps duration) of the thin foil target, and for low prepulse intensities, the proton beam is directed away from the ounperturbedo target normal. Observations are discussed in terms of target normal sheath acceleration, in combination with a laser-controllable shock locally deforming the target surface.