München 2019 – wissenschaftliches Programm
P 18.68: Poster
Donnerstag, 21. März 2019, 16:30–18:30, Foyer Audimax
Positrons polarization by nonlinear Compton scattering in strong laser field — •Yue-Yue Chen1, Pei-Len He2, Karen Z. Hatsagortsyan1, and Christoph H. Keitel1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Key Laboratory for Laser Plasmas (Ministry of Education) and Department of Physics and Astronomy, Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China
Accelerated beams of polarized positrons have important applications in high-energy and solid-state physics. Positrons produced in nonlinear Compton scattering of an ultra-relativistic electron beam and a focused PW laser pulse are polarized due to the asymmetry of spin-flip transitions and asymmetric dynamics of particles in laser fields. Both electrons and produced pairs can be polarized to a high degree in femtosecond time scale. A semi-classical model is developed to describe the classical spin procession, radiative polarization and spin resolved pair production simultaneously, which is appropriate for any field configuration and realistic trajectories of ultra-relativistic electrons.