Accuracy of the time-averaged ponderomotive approximation for laser-plasma accelerator modeling

Terzani, D.; Benedetti, C.; Schroeder, C. B.; Esarey, E.

doi:10.1063/5.0050580

Title: Accuracy of the time-averaged ponderomotive approximation for laser-plasma accelerator modeling

Journal Article · Mon Jun 14 00:00:00 EDT 2021 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0050580· OSTI ID:1825910

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^[2]; Esarey, E. ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)

Reliable modeling of laser-plasma accelerators, where a short and intense laser pulse propagates in an underdense plasma over long distances, is a computationally challenging task. This is due to the great disparity among the scales involved in the modeling, ranging from the micrometer scale of the laser wavelength to, for instance, the meter scale of the laser-plasma interaction length for a multi-GeV-class laser-plasma accelerator. To reduce such imbalance, the time-averaged ponderomotive approximation may be used, where the plasma particle dynamics is analytically averaged over the laser frequency, and only spatiotemporal scales associated with the laser envelope are retained in the calculations, resulting in significant computational savings. In this paper, we characterize the accuracy and robustness of the time-averaged ponderomotive approximation for a range of laser parameters of interest for present and future laser-plasma accelerators, and we show that the error introduced by the averaging process is small in all relevant cases.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1825910

Alternate ID(s):: OSTI ID: 1788137

Journal Information:: Physics of Plasmas, Vol. 28, Issue 6; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Accuracy of the time-averaged ponderomotive approximation for laser-plasma accelerator modeling

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