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Proceedings Paper

A table-top laser-based source of short, collimated, ultra-relativistic positron beams
Author(s): G. Sarri; W. Schumaker; A. Di Piazza; M. Vargas; B. Dromey; M. E. Dieckmann; V. Chvykov; A. Maksimchuk; V. Yanovsky; Z. H. He; B. X. Hou; J. A. Nees; A. G. R. Thomas; C. H. Keitel; M. Zepf; K. Krushelnick
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Paper Abstract

An ultra-relativistic electron beam passing through a thick, high-Z solid target triggers an electromagnetic cascade, whereby a large number of high energy photons and electron-positron pairs are produced. By exploiting this physical process, we present here the first experimental evidence of the generation of ultra-short, highly collimated and ultra-relativistic positron beams following the interaction of a laser-wakefield accelerated electron beam with high-Z solid targets. Clear evidence has also been obtained of the generation of GeV electron-positron jets with variable composition depending on the solid target material and thickness. The percentage of positrons in the overall leptonic beam has been observed to vary from a few per cent up to almost fifty per cent, implying a quasi-neutral electron-positron beam. We anticipate that these beams will be of direct relevance to the laboratory study of astrophysical leptonic jets and their interaction with the interstellar medium.

Paper Details

Date Published: 7 May 2013
PDF: 7 pages
Proc. SPIE 8779, Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III, 87790Z (7 May 2013); doi: 10.1117/12.2018744
Show Author Affiliations
G. Sarri, Queen's Univ. of Belfast (United Kingdom)
W. Schumaker, The Univ. of Michigan (United States)
A. Di Piazza, Max-Planck-Institut für Kernphysik (Germany)
M. Vargas, The Univ. of Michigan (United States)
B. Dromey, The Queen's Univ. of Belfast (United Kingdom)
M. E. Dieckmann, The Queen's Univ. of Belfast (United Kingdom)
V. Chvykov, The Univ. of Michigan (United States)
A. Maksimchuk, The Univ. of Michigan (United States)
V. Yanovsky, The Univ. of Michigan (United States)
Z. H. He, The Univ. of Michigan (United States)
B. X. Hou, The Univ. of Michigan (United States)
J. A. Nees, The Univ. of Michigan (United States)
A. G. R. Thomas, The Univ. of Michigan (United States)
C. H. Keitel, Max-Planck-Institut für Kernphysik (Germany)
M. Zepf, The Queen's Univ. of Belfast (United Kingdom)
Helmholtz Institute Jena (Germany)
K. Krushelnick, The Univ. of Michigan (United States)


Published in SPIE Proceedings Vol. 8779:
Laser Acceleration of Electrons, Protons, and Ions II; and Medical Applications of Laser-Generated Beams of Particles II; and Harnessing Relativistic Plasma Waves III
Eric Esarey; Carl B. Schroeder; Wim P. Leemans; Kenneth W. D. Ledingham; Dino A. Jaroszynski, Editor(s)

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