Creation and direct laser acceleration of positrons in a single stage

Abstract

Relativistic positron beams are required for fundamental research in nonlinear strong field QED, plasma physics, and laboratory astrophysics. Positrons are difficult to create and manipulate due to their short lifetime, and their energy gain is limited by the accelerator size in conventional facilities. Alternative compact accelerator concepts in plasmas are becoming more and more mature for electrons, but positron generation and acceleration remain an outstanding challenge. Here we propose a new setup where we can generate, inject and accelerate them in a single stage during the propagation of an intense laser in a plasma channel. The positrons are created from a laser-electron collision at 90 degrees, where the injection and guiding are made possible by an 800 nC electron beam loading which reverses the sign of the background electrostatic field. We obtain a 20 fC positron beam, with GeV-level central energy within 0.5 mm of plasma.

arXiv comment9 pages, 5 figures

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Cited by in corpus (10)

• Direct laser acceleration in underdense plasmas with multi-PW lasers: a path to high-charge, GeV-class electron bunches
• The Influence of Laser Focusing Conditions on the Direct Laser Acceleration of Electrons
• Direct laser acceleration: A model for the electron injection from the walls of a cylindrical guiding structure
• Charged particle beam transport in a flying focus pulse with orbital angular momentum
• Direct laser acceleration in varying plasma density profiles
• Positron acceleration in plasma waves driven by non-neutral fireball beams
• A compact, all-optical positron production and collection scheme
• Visualization of high-intensity laser-matter interactions in virtual reality and web browser
• Collimated $\gamma$-flash emission along the target surface irradiated by a laser at non-grazing incidence
• Collision parameters needed to measure polarisation-dependent nonlinear pair creation