Driving positron beam acceleration with coherent transition radiation
Journal article, 2020

Positron acceleration in plasma wakefield faces significant challenges, as the positron beam must be pre-generated and precisely coupled into the wakefield and, most critically, suffers from defocusing issues. Here we propose a scheme that utilizes laser-driven electrons to produce, inject, and accelerate positrons in a single setup. The high-charge electron beam from wakefield acceleration creates copious electron–positron pairs via the Bethe–Heitler process, followed by enormous coherent transition radiation due to the electrons’ exiting from the metallic foil. Simulation results show that the coherent transition radiation field reaches up to tens of GV m−1, which captures and accelerates the positrons to cut-off energy of 1.5 GeV with energy peak of 500 MeV (energy spread ~ 24.3%). An external longitudinal magnetic field of 30 T is also applied to guide the electrons and positrons during the acceleration process. This proposed method offers a promising way to obtain GeV fast positron sources.


Zhangli Xu

Chinese Academy of Sciences

Longqing Yi

Chalmers, Physics, Subatomic and Plasma Physics

Baifei Shen

Shanghai Normal University

Chinese Academy of Sciences

Jiancai Xu

Chinese Academy of Sciences

Liangliang Ji

Chinese Academy of Sciences

Tongjun Xu

Chinese Academy of Sciences

Lingang Zhang

Chinese Academy of Sciences

Shun Li

Chinese Academy of Sciences

Zhizhan Xu

Chinese Academy of Sciences

Communications Physics

23993650 (eISSN)

Vol. 3 1 191

Subject Categories

Accelerator Physics and Instrumentation

Atom and Molecular Physics and Optics

Fusion, Plasma and Space Physics



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