Speaker
Gianluca Sarri
Description
We report on the first direct and comprehensive characterisation of the spatial and spectral properties of near-GeV positron beams generated in a fully laser-driven configuration, using a 100 TW-class laser system.
More than $10^5$ positrons are generated within 5% of energies exceeding 500 MeV, and isolated using an energy selection system. The beam exhibited a normalised emittance at 600 MeV of 18 micron, a source size of 5 micron, and a longitudinal length < 15 micron.
We propose that positron beams with these characteristics will enable the experimental study and optimisation of plasma-based positron accelerators.
