Non-invasive characterisation of a laser-driven positron beam

Aaron Alejo, Guillermo Javier Samarin, Richard Warwick, Conor McCluskey, Giada Cantono, Tiberio Ceccotti, Sandrine Dobosz Dufrénoy, Pascal Monot, Gianluca Sarri

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)
85 Downloads (Pure)


We report on an indirect and non-invasive method to simultaneously characterise the energy-dependent emittance and source size of ultra-relativistic positron beams generated during the propagation of a laser-wakefield accelerated electron beam through a high-Z converter target. The strong correlation of the geometrical emittance of the positrons with that of the scattered electrons allows the former to be inferred, with high accuracy, from monitoring the latter. The technique has been tested in a proof-of-principle experiment where, for 100 MeV positrons, we infer geometrical emittances and source sizes of the order of 3micron and 150 micron, respectively. This is consistent with the numerically predicted possibility of achieving sub-micron geometrical emittances and micron-scale source sizes at the GeV level.
Original languageEnglish
Article number055013
Number of pages7
JournalPlasma Physics and Controlled Fusion
Issue number5
Early online date10 Mar 2020
Publication statusPublished - 20 Apr 2020


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