Particle Acceleration 2

[HEDS8-04] Density dependence of positron acceleration by longitudinal electric field in relativistic laser-plasma interaction

*Kaoru Sugimoto¹ (1. Yuakawa Institute for Theoretical Physics, Kyoto University)

We performed 2D PIC simulation of interaction between an ultra-intense laser light and a near critical density plasma. It has been observed that e^--e⁺ pair creation happened due to photon collisions. Some of the positrons are accelerated by a longitudinal electric field induced by a charge separation at the laser pulse front. The positrons are energized to near GeV level. We also confirmed that positron acceleration can be caused by initial target density 0.5-5.6n_c.