Trace of Self-Injected Electron Bunches in a Laser Wakefield

The motion of self-injected electrons into a laser wakefield is traced using a 2-D electromagnetic and relativistic particle-in-cell simulation. It gives important information about where the injected electrons were located initially in the background plasma and how those electrons are injected into a laser wakefield. After self-injection, the electron bunches show betatron oscillations while being accelerated.