A table-top laser-based source of femtosecond, collimated, ultra-relativistic positron beams

G. Sarri, W. Schumaker, A. Di Piazza +13

The generation of ultra-relativistic positron beams with short duration (${\tau }_{e^{+}}\le 30$ fs), small divergence (${\theta }_{e^{+}}\simeq 3$ mrad), and high density ($n_{e^+} \simeq 10^{14…