Advanced Quasistatic Approximation

@article{Tuev2022AdvancedQA,
  title={Advanced Quasistatic Approximation},
  author={Petr Tuev and R I Spitsyn and K. V. Lotov},
  journal={SSRN Electronic Journal},
  year={2022}
}
The quasistatic approximation (QSA) is an efficient method of simulating laser- and beam-driven plasma wakefield acceleration, but it becomes imprecise if some plasma particles make long longitudinal excursions in a strongly nonlinear wave, or if waves with non-zero group velocity are present in the plasma, or the plasma density gradients are sharp, or the beam shape changes rapidly. We present an extension to QSA that is free from its limitations and retains its main advantages of speed and… 

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