EuroNNAc Special Topics Workshop

GeV-scale low-emittance positron beams from a laser-wakefield accelerator

Not scheduled

1h

Hotel Hermitage, La Biodola Bay, Isola d'Elba, Italy

Poster

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.