Positron beam acceleration driven by laser-accelerated electron beam
Year: 2019
Type: preprint
Abstract: A positron beam, produced in copper target based on laser-accelerated energetic electrons, is accelerated from a few MeVs to several hundred MeVs in strong longitudinal electric field induced by the co-propagating high-density electron beam. This new acceleration scheme for positron beams is demonstrated by two-dimensional particle-in-cell simulation and Monte-Carlo code. The electron beam after passing through the copper target keeps its high density ~10^17cm-3 for 0.7 m propagation distance, with the guiding from an external longitudinal magnetic field of 30 T and provides a strong acceleration field of GV/m for the positrons. Simulation results indicate that a positron beam with an initial Maxwellian-energy-spectrum of Tp = 24.1 MeV is accelerated to quasi-monoenergetic peaks up to 796.5 MeV with energy spread of 18.7% when 10 PW laser pulse is employed. The angular divergence of the positron beam is 2.3 mrad and the charge is 12 pC. This proposed method resolves the creation, injection and acceleration of positrons in a single set-up, which offers a new way to accelerate high-energy positrons for potential modest-sized all-optical electron-positron colliders.
Source: arXiv (Cornell University)
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2946812434