Manipulation of the spatial distribution of laser-accelerated proton beams by varying the laser intensity distribution
Journal article, 2016

We report on a study of the spatial profile of proton beams produced through target normal sheath acceleration using flat target foils and changing the laser intensity distribution on the target front surface. This is done by either defocusing a single laser pulse or by using a split-pulse setup and irradiating the target with two identical laser pulses with variable spatial separation. The resulting proton beam profile and the energy spectrum are recorded as functions of the focal spot size of the single laser pulse and of the separation between the two pulses. A shaping of the resulting proton beam profile, related to both an increase in flux of low-energy protons in the target normal direction and a decrease in their divergence, in one or two dimensions, is observed. The results are explained by simple modelling of rear surface sheath field expansion, ionization, and projection of the resulting proton beam.


B. Aurand

Lund University

Heinrich Heine University Düsseldorf

L. Senje

Lund University

Krister Svensson

Lund University

M. Hansson

Lund University

A. Higginson

University of Strathclyde

Arkady Gonoskov

Chalmers, Physics, Theoretical Physics

Mattias Marklund

Chalmers, Physics, Theoretical Physics

A. Persson

Lund University

O. Lundh

Lund University

D. Neely

Rutherford Appleton Laboratory

P. McKenna

University of Strathclyde

C.G. Wahlström

Lund University

Physics of Plasmas

1070-664X (ISSN) 1089-7674 (eISSN)

Vol. 23 2 023113


Basic sciences

Subject Categories

Atom and Molecular Physics and Optics

Fusion, Plasma and Space Physics



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