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Yu, P., Xu, X., Davidson, A., Tableman, A., Dalichaouch, T., Li, F....Mori, W. B. (2016). Enabling Lorentz boosted frame particle-in-cell simulations of laser wakefield acceleration in quasi-3D geometry. Journal of Computational Physics. 316, 747-759

P. Yu et al.,  "Enabling Lorentz boosted frame particle-in-cell simulations of laser wakefield acceleration in quasi-3D geometry", in Journal of Computational Physics, vol. 316, pp. 747-759, 2016

@article{yu2016_1714767363750,
	author = "Yu, P. and Xu, X. and Davidson, A. and Tableman, A. and Dalichaouch, T. and Li, F. and Meyers, M. D. and An, W. and Tsung, F. S. and Decyk, V. K. and Fiuza, F. and Vieira, J. and Fonseca, R. A. and Lu, W. and Silva, L. O. and Mori, W. B.",
	title = "Enabling Lorentz boosted frame particle-in-cell simulations of laser wakefield acceleration in quasi-3D geometry",
	journal = "Journal of Computational Physics",
	year = "2016",
	volume = "316",
	number = "",
	doi = "10.1016/j.jcp.2016.04.014",
	pages = "747-759",
	url = "http://www.sciencedirect.com/science/article/pii/S0021999116300468"
}

TY  - JOUR
TI  - Enabling Lorentz boosted frame particle-in-cell simulations of laser wakefield acceleration in quasi-3D geometry
T2  - Journal of Computational Physics
VL  - 316
AU  - Yu, P.
AU  - Xu, X.
AU  - Davidson, A.
AU  - Tableman, A.
AU  - Dalichaouch, T.
AU  - Li, F.
AU  - Meyers, M. D.
AU  - An, W.
AU  - Tsung, F. S.
AU  - Decyk, V. K.
AU  - Fiuza, F.
AU  - Vieira, J.
AU  - Fonseca, R. A.
AU  - Lu, W.
AU  - Silva, L. O.
AU  - Mori, W. B.
PY  - 2016
SP  - 747-759
SN  - 0021-9991
DO  - 10.1016/j.jcp.2016.04.014
UR  - http://www.sciencedirect.com/science/article/pii/S0021999116300468
AB  - When modeling laser wakefield acceleration (LWFA) using the particle-in-cell (PIC) algorithm in a Lorentz boosted frame, the plasma is drifting relativistically at beta(b)c towards the laser, which can lead to a computational speedup of similar to gamma(2)(b)=(1-beta(2)(b))-1. Meanwhile, when LWFA is modeled in the quasi-3D geometry in which the electromagnetic fields and current are decomposed into a limited number of azimuthal harmonics, speedups are achieved by modeling three dimensional (3D) problems with the computational loads on the order of two dimensional r-z simulations. Here, we describe a method to combine the speedups from the Lorentz boosted frame and quasi-3D algorithms. The key to the combination is the use of a hybrid Yee-FFT solver in the quasi-3D geometry that significantly mitigates the Numerical Cerenkov Instability (NCI) which inevitably arises in a Lorentz boosted frame due to the unphysical coupling of Langmuir modes and EM modes of the relativistically drifting plasma in these simulations. In addition, based on the space-time distribution of the LWFA data in the lab and boosted frame, we propose to use a moving window to follow the drifting plasma, instead of following the laser driver as is done in the LWFA lab frame simulations, in order to further reduce the computational loads. We describe the details of how the NCI is mitigated for the quasi-3D geometry, the setups for simulations which combine the Lorentz boosted frame, quasi-3D geometry, and the use of a moving window, and compare the results from these simulations against their corresponding lab frame cases. Good agreement is obtained among these sample simulations, particularly when there is no self-trapping, which demonstrates it is possible to combine the Lorentz boosted frame and the quasi-3D algorithms when modeling LWFA. We also discuss the preliminary speedups achieved in these sample simulations.
ER  -