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Laser-driven generation of collimated ultra-relativistic positron beams
Queen's University Belfast, UK. (Centre for Plasma Physics)
University of Michigan, Ann Arbor, USA. (Center for Ultrafast Optical Science)
Max-Planck-Institut für Kernphysik, Germany.
Imperial College, London, UK.
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2013 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 55, no 12Article in journal (Refereed) Published
Abstract [en]

We report on recent experimental results concerning the generation of collimated (divergence of the order of a few mrad) ultra-relativistic positron beams using a fully optical system. The positron beams are generated exploiting a quantum-electrodynamic cascade initiated by the propagation of a laser-accelerated, ultra-relativistic electron beam through high-Z solid targets. As long as the target thickness is comparable to or smaller than the radiation length of the material, the divergence of the escaping positron beam is of the order of the inverse of its Lorentz factor. For thicker solid targets the divergence is seen to gradually increase, due to the increased number of fundamental steps in the cascade, but it is still kept of the order of few tens of mrad, depending on the spectral components in the beam. This high degree of collimation will be fundamental for further injection into plasma-wakefield afterburners.

Place, publisher, year, edition, pages
London: Institute of Physics (IOP), 2013. Vol. 55, no 12
Keyword [en]
relativistic beams, positrons, laser plasma
National Category
Fusion, Plasma and Space Physics
URN: urn:nbn:se:liu:diva-102616DOI: 10.1088/0741-3335/55/12/124017OAI: diva2:680019
Available from: 2013-12-17 Created: 2013-12-17 Last updated: 2014-01-20Bibliographically approved

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