Simulations On Pair Creation In Collision Of $\gamma$-Beams Produced With High Intensity Lasers

Direct production of electron-positron pairs in two photon collisions, the Breit-Wheeler process, is one of the most basic processes in the universe[1]. However, this process has never been directly observed in the laboratory due to the lack of high intensity $\gamma$ sources[2]. For a feasibility study and for the optimisation of experimental set-ups[3] we developed a high-performance tree-code. Different possible set-ups with MeV photon sources were discussed and compared using collision detection for huge number of particles in a quantum-electrodynamic regime. For this we implemented bounding volume hierarchies in a tree-like code structure. We applied this code on the question whether the Texas Petawatt laser[5] could produce a significant number of pairs within the framework of the NSF project National Science Foundation under Grant No. 1632777.\\ \hfill \newline References: [1] Ruffini, R. \textit{et al.} Physics Reports {\bf 487}, 1-140 (2010). [2] Bamber C. et al. Phys. Rev. D, {\bf 60}, 092004 (1999). [3] X. Ribeyre \textit{et al.}, Phys. Rev. E {\bf 93}, 013201 (2016). [4] C. Ericson, Real Time Collision Detection, CRC Press, New York, (2005). [5] Gaul \textit{et al.}, Tech. Digest (Opti. Soc. of America, 2005), {\bf JFB2}.