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Laser-driven generation of collimated ultra-relativistic positron beams

Research output: Contribution to journalJournal article

Published
  • G. Sarri
  • W. Schumaker
  • A. Di Piazza
  • K. Poder
  • J. M. Cole
  • M. Vargas
  • D. Doria
  • S. Kushel
  • B. Dromey
  • G. Grittani
  • L. Gizzi
  • M. E. Dieckmann
  • A. Green
  • V. Chvykov
  • A. Maksimchuk
  • V. Yanovsky
  • Z. H. He
  • B. X. Hou
  • J. A. Nees
  • S. Kar
  • Z. Najmudin
  • C. H. Keitel
  • K. Krushelnick
  • M. Zepf
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Article number124017
<mark>Journal publication date</mark>12/2013
<mark>Journal</mark>Plasma Physics and Controlled Fusion
Issue number12
Volume55
Number of pages6
<mark>State</mark>Published
Early online date28/11/13
<mark>Original language</mark>English
Event40th Conference of the European-Physical-Society on Plasma Physics - Espoo, Finland

Conference

Conference40th Conference of the European-Physical-Society on Plasma Physics
CountryFinland
CityEspoo
Period1/07/135/07/13

Abstract

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.