Acceleration of Cone-Produced Electrons by Double-Line Ti-Sapphire Laser Beating

We proposed a new scheme for simultaneously injecting and accelerating electrons. Acceleration and stochastic heating of electrons are demonstrated in a beat wave scheme using a pre-pulse free short-pulse (150 fs) double-line Ti-Sapphire laser. The laser beat wave produces a resonant relativistic plasma wave of field intensity 11 GV/m in a hydrogen plasma of density ${2.5 \times 10^{18} cm^{-3}}$. To inject electrons, we used a hybrid target composed of a cone-drilled plane and a gas jet, where the cone-produced electrons are accelerated via the resonant plasma wave excited in the gas jet set behind the plane, increasing the slope temperature from 0.05 MeV to 0.15 MeV. A one-dimensional particle-in-cell simulation and a stochastic acceleration model confirm the slope temperature increase.