Simulating laser wakefield acceleration (LWFA) in a Lorentz boosted frame in which the plasma drifts towards the laser with $v_b$ can speedup the simulation by factors of $γ^2_b=(1-v^2_b/c^2)^{-1}$. In these simulations the relativistic drifting plasma inevitably induces a high frequency numerical instability that contaminates the interested physics. Various approaches have been proposed to mitigate this instability. One approach is to solve Maxwell equations in Fourier space (a spectral solver) as this has been shown to suppress the fastest growing modes of this instability in simple test problems using a simple low pass, ring (in two dimensions), or shell (in three dimensions) filter in Fourier space. We describe the development of a fully parallelized, multi-dimensional, particle-in-cell code that uses a spectral solver to solve Maxwell's equations and that includes the ability to launch a laser using a moving antenna. This new EM-PIC code is called UPIC-EMMA and it is based on the components of the UCLA PIC framework (UPIC). We show that by using UPIC-EMMA, LWFA simulations in the boosted frames with arbitrary $γ_b$ can be conducted without the presence of the numerical instability. We also compare the results of a few LWFA cases for several values of $γ_b$, including lab frame simulations using OSIRIS, a EM-PIC code with a finite difference time domain (FDTD) Maxwell solver. These comparisons include cases in both linear, and nonlinear regimes. We also investigate some issues associated with numerical dispersion in lab and boosted frame simulations and between FDTD and spectral solvers.
Optimized matching conditions for self-guided laser wakefield accelerators
ELI Beamlines Facility, The Extreme Light Infrastructure ERIC（ELI光束线设施，极端光基础设施欧洲研究基础设施联盟）；University of Rochester（罗切斯特大学）；Princeton University（普林斯顿大学）；Czech Technical University in Prague（布拉格捷克技术大学）
Bayesian Optimization of Molybdenum-99 Production by Laser Wakefield Acceleration Using Coupled PIC and Monte Carlo Simulations
Nuclear and Energy Research Institute, IPEN–CNEN（核能与研究设备研究所，IPEN-CNN）；Federal University of Health Sciences of Porto Alegre (UFCSPA)（阿雷格里港联邦健康科学大学（UFCSPA））
High-order exponential solver method for particle-in-cell simulations
ELI ALPS, ELI-HU Non-Profit Ltd.（ELI ALPS, ELI-HU 非营利有限公司）；Doctoral School of Physics, Faculty of Science and Informatics, University of Szeged（塞格德大学科学与信息学院物理博士学院）
Controlling the Numerical Cerenkov Instability in PIC simulations using a customized finite difference Maxwell solver and a local FFT based current correction
Mitigation of numerical Cerenkov radiation and instability using a hybrid finite difference-FFT Maxwell solver and a local charge conserving current deposit
