Speaker
Description
Quasistatic approximation (QSA) offers opportunities for computationally efficient modeling of laser pulse propagation over long distances. When simulating the channeling of a powerful laser pulse over tens of meters (studied in the context of XCELS project), the QSA gives a speedup of six orders of magnitude compared to the particle-in-cell method. This estimate takes into account the need to resolve the laser wavelength for correct modeling of a strongly depleted pulse. Moreover, QSA allows to speed up the parametric optimization of the wakefield acceleration by dividing it into two steps: first we find the best regime of laser pulse propagation, and then we optimize the witness parameters by simulating the wave only in the vicinity of the witness. The two-step optimization also minimizes the witness emittance growth due to numerical noise of the plasma solver.
