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Open Access research that challenges the mind...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including those from the School of Psychological Sciences & Health - but also papers by researchers based within the Faculties of Science, Engineering, Humanities & Social Sciences, and from the Strathclyde Business School.

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Scaling of proton acceleration driven by petawatt-laser-plasma interactions

Robson, L. and Simpson, P.T. and Clarke, R.J. and Ledingham, K.W.D. and Lindau, F. and Lundh, O. and McCanny, T. and Mora, P. and Neely, D. and Wahlström, C.G. and Zepf, M. and McKenna, P. (2007) Scaling of proton acceleration driven by petawatt-laser-plasma interactions. Nature Physics, 3. pp. 58-62. ISSN 1745-2473

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Abstract

The possibility of using high-power lasers to generate high-quality beams of energetic ions is attracting large global interest. The prospect of using laser-accelerated protons in medicine attracts particular interest, as these schemes may lead to compact and relatively low-cost sources. Among the challenges remaining before these sources can be used in medicine is to increase the numbers and energies of the ions accelerated. Here, we extend the energy and intensity range over which proton scaling is experimentally investigated, up to 400 J and 6×1020 Wcm−2 respectively, and find a slower proton scaling than previously predicted.With the aid of plasma-expansion simulation tools, our results suggest the importance of time-dependent andmultidimensional effects in predicting the maximum proton energy in this ultrahigh-intensity regime. The implications of our new understanding of proton scaling for potential medical applications are discussed.