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Investigation of γ-photon sources using near-critical density targets towards the optimization of the linear Breit–Wheeler process
Plasma Physics and Controlled Fusion ( IF 2.2 ) Pub Date : 2024-02-06 , DOI: 10.1088/1361-6587/ad20f7 Iuliana-Mariana Vladisavlevici , Xavier Ribeyre , Daniel Vizman , Emmanuel d’Humières
Plasma Physics and Controlled Fusion ( IF 2.2 ) Pub Date : 2024-02-06 , DOI: 10.1088/1361-6587/ad20f7 Iuliana-Mariana Vladisavlevici , Xavier Ribeyre , Daniel Vizman , Emmanuel d’Humières
In this paper we analyze the production of high energy synchrotron gamma photons in laser-plasma interaction for a laser intensity in 1022–
5 ⋅ 10 23 W c m − 2 and a near-critical density target using two dimensional particle-in-cell simulations. In the optimum configuration to maximize the conversion efficiency of the laser energy to γ -photons, we studied the production of electron–positron pairs by the linear Breit–Wheeler process in the collision of two identical γ -photon beams using a dedicated photon-photon collision simulation code. A maximum laser energy conversion coefficient of
33 % in high energy photons was obtained and a photon beam intensity, with energies above
1 MeV , of
2 ⋅ 10 20 W c m − 2 at
150 μ m distance from the initial position of the target (for the highest laser intensity considered). We show that the optimum case to detect the linear Breit–Wheeler pairs corresponds to a laser intensity of
10 23 W c m − 2 . Our results can be used for the preparation of experimental campaigns for the detection of linear Breit–Wheeler pairs at the Apollon and ELI laser facilities.
更新日期：2024-02-06
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