All-optical bright gamma-ray and dense positron source by laser driven plasmas-filled cone

作者：Liu, Jin Jin; Yu, Tong Pu^*; Yin, Yan; Zhu, Xing Long; Shao, Fu Qiu

来源：Optics Express, 2016, 24(14): 15978-15986.

DOI：10.1364/OE.24.015978

An all-optical scheme for bright gamma-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 gamma-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 similar to 10(27) m(-3). The scheme is further demonstrated by full 3D PIC simulations, which indicates a positron number up to 2x10(9). This compact gamma-rays and e(-)e(+) pair source may have many potential applications, such as the laboratory study of astrophysics and nuclear physics.

• 出版日期2016-7-11
• 单位中国人民解放军国防科学技术大学