HPC in Asia:
(A10) Poster from Taiwan: Simulation Studies of Sub-Terawatt Laser Wakefield Acceleration
TimeWednesday, June 27th10am - 11am
DescriptionLaser wakefield acceleration (LWFA) can be operated at a high repetition rate to generate MeV electron beams by injecting sub-terawatt (TW) laser pulses into high-density gas target. A three-dimensional (3-D) particle-in-cell (PIC) model was developed to simulate the process of highly nonlinear and complicated laser-plasma interaction in sub-TW LWFA. Since the front foot of the laser pulse ionizes the gas target, the field ionization model is considered. Based on the finite-difference time-domain (FDTD) method, the governing equations including Maxwell’s equations and Lorentz force equations are used to describe the evolution of electromagnetic fields and plasma dynamics. Each simulation is performed in a moving frame co-propagating with the laser pulse. The simulation box is defined as Lx=80 μm along the (x-)direction of the laser propagation, while Ly=Lz =40 μm in the transverse y- and z-directions. To ensure a high accuracy, the cell sizes are determined as x~32 nm and y=z=200 nm while the particle number per cell is set as 8, which gives up to 8×109 particles in the simulation domain. This is a computing intensive task, therefore, the parallelization with message passing interface (MPI) is conducted to improve the simulation efficiency. Finally, the numerical results of the sub-TW LWFA will be demonstrated and discussed in the poster.