6 Hits in 17.2 sec

Mitigation of numerical Cerenkov radiation and instability using a hybrid finite difference-FFT Maxwell solver and a local charge conserving current deposit

Peicheng Yu, Xinlu Xu, Adam Tableman, Viktor K. Decyk, Frank S. Tsung, Frederico Fiuza, Asher Davidson, Jorge Vieira, Ricardo A. Fonseca, Wei Lu, Luis O. Silva, Warren B. Mori
2015 Computer Physics Communications  
A current correction is applied for the charge conserving current deposit to correctly account for the EM calculation in hybrid Yee-FFT solver.  ...  In this solver, the EM fields are solved in k space by performing an FFT in one direction, while using finite difference operators in the other direction(s).  ...  Summary We proposed to use a hybrid Yee-FFT and a rigorous charge conserving current deposit for solving Maxwell's equations in order to eliminate the numerical Cerenkov instability in PIC codes when modeling  ... 
doi:10.1016/j.cpc.2015.08.026 fatcat:ubenep4j2veqhj7ojnjdyfyfky

An O(N) Maxwell solver with improved numerical dispersion properties [article]

Yingchao Lu, Chengkun Huang, Patrick Kilian, Fan Guo, Hui Li, Edison Liang
2019 arXiv   pre-print
A Maxwell solver derived from finite element method with O(N) computing cost is developed to improve the numerical dispersion properties in relativistic particle-in-cell (PIC) simulations.  ...  This Maxwell solver constrains the Numerical Cherenkov instability (NCI) for the ultra-relativistic drifting pair plasma in x direction to large wave vectors for two dimensional grid.  ...  Controlling the numerical cerenkov in- stability in PIC simulations using a customized finite differ- ence maxwell solver and a local FFT based current correction.  ... 
arXiv:1907.13088v2 fatcat:bk4674nx75hylcoyvyk3icuzya

A particle-in-cell method for the simulation of plasmas based on an unconditionally stable field solver

Eric M. Wolf, Matthew Causley, Andrew Christlieb, Matthew Bettencourt
2016 Journal of Computational Physics  
We propose a new particle-in-cell (PIC) method for the simulation of plasmas based on a recently developed, unconditionally stable solver for the wave equation.  ...  This method is not subject to a CFL restriction, limiting the ratio of the time step size to the spatial step size, typical of explicit methods, while maintaining computational cost and code complexity  ...  discrete form of Gauss' law through their field solvers and charge and current weighting schemes will suffer severe numerical errors related to charge conservation [9] .  ... 
doi:10.1016/ fatcat:ieqgy2fp5vfgpc56bgygatbrna

PIC methods in astrophysics: Simulations of relativistic jets and kinetic physics in astrophysical systems [article]

Kenichi Nishikawa, Ioana Dutan, Christoph Köhn, Yosuke Mizuno
2021 arXiv   pre-print
We review a plethora of astrophysical phenomena such as relativistic jets, instabilities, magnetic reconnection, pulsars, as well as PIC simulations of laser-plasma physics (until 2021) emphasizing the  ...  Finally, we give an outlook of the future simulations of jets associated to neutron stars, black holes and their merging and discuss the future of PIC simulations in the light of petascale and exascale  ...  Acknowledgments We acknowledge support by a visiting fellowship of by the EPSRC grants: EP/P010059/1, EP/K022415 EP/N027175/1 and by the grant ENE2016-75703-R fr Spanish Ministerio de Educación.  ... 
arXiv:2008.02105v3 fatcat:5uttdaqnrjekbemtgaxwliafua

PIConGPU: Predictive Simulations of Laser-Particle Accelerators with Manycore Hardware

Axel Huebl, Michael Dr. Bussmann, Thomas Dr. Kluge, Ulrich Prof. Dr. Schramm, Thomas E. Prof. Dr. Cowan, Paul Prof. Dr. Gibbon, Burkhardt Prof. Dr. Kämpfer, Stefan PD Dr. Grafström
2019 Zenodo  
PIConGPU is designed with a modular and extensible implementation, allowing to compute on current and upcoming hardware from a single code base.  ...  Numerical studies are performed on two novel targets for laser-proton acceleration with near-critical and mass-limited properties.  ...  "Controlling the numerical Cerenkov instability in PIC simulations using a customized finite difference Maxwell solver and a local FFT based current correction". In: Comput. Phys. Commun. ( ), pp. -.  ... 
doi:10.5281/zenodo.3266819 fatcat:b73a3zvxvjecjplcsks7gf52cu

Papers presented at EPAC 2006

Accelerator Division
In particular, one of the main goals is to study the generation of high-current electron pulses by interleaving bunch trains in delay lines and rings using transverse RF deflectors.  ...  First collisions have been tested at low currents. In this paper we describe the experimental results and compare them with expectations and numerical simulations.  ...  Stephan and J. Sekutowicz, authors of previous injectors overview [6,7], for the many helpful and useful suggestions.  ... 
doi:10.15161/ fatcat:2beci4umx5asvps2jmfewfvlci