Investigation of electron self-injection threshold in the non-linear cavity regime, using tandem-pulse scheme

Injection schemes are playing an essential role in producing the laser-driven electron beam and X-ray radiation. Self-injection is one of the schemes leading to high current and low energy spread, however, it is difficult to achieve. In this talk the process of electron self-injection in nonlinear cavity regime using two co-propagating laser-pulses is described. In particular the advantages of the tandem-pulse scheme in terms of injection threshold, electron energy and betatron radiation are demonstrated. Based on our investigation, double-pulse scheme decreases the threshold for electron self-injection.