Comparisons of time explicit hybrid kinetic-fluid code Architect for Plasma Wakefield Acceleration with a full PIC code

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• 作者：F. Massimo^a ; ^b ; ^{francesco.massimo@ensta-paristech.fr" class="auth_mail" title="E-mail the corresponding author} ; S. Atzeni^b ; A. Marocchino^b ; ^c
• 关键词：Particle in Cell codes ; Plasma Wakefield Acceleration ; Hybrid codes
• 刊名：Journal of Computational Physics
• 出版年：2016
• 出版时间：15 December 2016
• 年：2016
• 卷：327
• 期：Complete
• 页码：841-850
• 全文大小：4899 K

文摘

Architect, a time explicit hybrid code designed to perform quick simulations for electron driven plasma wakefield acceleration, is described. In order to obtain beam quality acceptable for applications, control of the beam-plasma-dynamics is necessary. Particle in Cell (PIC) codes represent the state-of-the-art technique to investigate the underlying physics and possible experimental scenarios; however PIC codes demand the necessity of heavy computational resources. Architect code substantially reduces the need for computational resources by using a hybrid approach: relativistic electron bunches are treated kinetically as in a PIC code and the background plasma as a fluid. Cylindrical symmetry is assumed for the solution of the electromagnetic fields and fluid equations. In this paper both the underlying algorithms as well as a comparison with a fully three dimensional particle in cell code are reported. The comparison highlights the good agreement between the two models up to the weakly non-linear regimes. In highly non-linear regimes the two models only disagree in a localized region, where the plasma electrons expelled by the bunch close up at the end of the first plasma oscillation.