Laser plasma wakefield acceleration is a promising development path for acceleration technologies. Studying this phenomenon relies heavily on numerical simulations. Generic PIC simulations provide the most detailed description of laser-plasma interaction, but they are computationally demanding. Simplyfing the model, e.g., with quasistatic approximation, yields significant performance gains at the cost of not accounting for some physical processes, such as plasma electron self-trapping. However, the simulations of high energetic part of plasma electrons with full equation of the motion in quasistatic code allow one to obtain reasonable data about electron self-trapping. With both quasistatic and PIC codes available, parametric scans could be carried out with fast code, leaving only the most important points to be verified in detail with PIC code. We have used modified quasistatic code LCODE and PIC code WARP to study low power laser pulse interaction with plasma. Both codes give similar results. The focusing of laser pulse into plasma leads to modification of self-focusing laser-plasma instability and higher wake amplitude. The beam formation can be initiated by this processes. The beam parameters dependence on plasma profile has also been studied. The reported study was funded by RFBR and Government of the Novosibirsk region according to the research project No. 17-41-543162.
|Working group||Theory and computation|