Speaker
Description
Ultra-low emittance and GeV energy scale electron beams can be obtained in the Laser Wake Field Acceleration (LWFA) framework by employing advanced ionization injection techniques, such as the Two-Color and the Resonant Multi-Pulse Ionization injection (ReMPI) schemes. There, a tightly focused, short wavelength (ionization) pulse extracts electrons from a selected inner shells of a dopant, allowing them to be longitudinally compressed and trapped in the wake field excited by a different (driver) pulse. We demonstrate for the first time, by means of analytical results and Particle In Cell simulations, that electron beams with unprecedented brightness and tuneable rms duration as low as 340as, can be generated in a reproducible way with a simplified ReMPI scheme in which the driver is constituted by a two pulses train. By employing a 300TW Ti:Sa laser system and a delay mask to generate a two pulses driver train, 340as long electron beams with 2.3~GeV energy, 6.1pC charge, 0.15% projected energy spread, 60nm averaged normalised emittance, and projected 6D brightness in excess of
3 10^18 A/m^2/0.1%bw can be generated.
Another path under active exploration is the possibility to use a P-MOPA generated pulse train as the wake field driver, thus making a P-MOPA/ReMPI scheme. We will report about the first simulations devoted at the the searching for reliable working point with state of the art technologies.
