Open AccessAll-optical bright γ-ray and dense positron source by laser driven plasmas-filled cone
Author(s) -
Jin-Jin Liu,
Tong-Pu Yu,
Y. Yin,
Xing-Long Zhu,
F. Q. Shao
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.015978
Subject(s) - physics , laser , electron , compton scattering , plasma , thomson scattering , optics , photon , positron , radiation , atomic physics , scattering , nuclear physics
An all-optical scheme for bright γ-rays and dense e - e + pair source is proposed by irradiating a 10 22 W/cm 2 laser onto a near-critical-density plasmas filled Al cone. Two-dimensional (2D) QED particle-in-cell (PIC) simulations show that, a dense electron bunch is confined in the laser field due to the radiation reaction and the trapped electrons oscillate transversely, emitting bright γ-rays forward in two ways: (1) nonlinear Compton scattering due to oscillation of electrons in the laser field, and (2) Compton backwardscattering resulting from the bunch colliding with the reflected laser by the cone tip. Finally, the multi-photon Breit-Wheeler process is initiated, producing abundant e - e + pairs with a density of ∼ 10 27 m -3 . The scheme is further demonstrated by full 3D PIC simulations, which indicates a positron number up to 2 × 10 9 . This compact γ-rays and e - e + pair source may have many potential applications, such as the laboratory study of astrophysics and nuclear physics.