Computational modeling of proton acceleration with multi-picosecond and high energy, kilojoule, lasers

Kim, J.; Kemp, A. J.; Wilks, S. C.; Kalantar, D. H.; Kerr, S.; Mariscal, D.; Beg, F. N.; McGuffey, C.; Ma, T.

doi:10.1063/1.5040410

Title: Computational modeling of proton acceleration with multi-picosecond and high energy, kilojoule, lasers

Journal Article · Fri Aug 10 00:00:00 EDT 2018 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.5040410· OSTI ID:1718995

^[1]; Kemp, A. J. ^[2]; Wilks, S. C. ^[2]; Kalantar, D. H. ^[2]; Kerr, S. ^[2]; Mariscal, D. ^[2]; Beg, F. N. ^[1];

^[1]; Ma, T. ^[2]

Univ. of California, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Here, we use computational modeling to investigate proton beam generation from kilojoule, multi-picosecond laser pulses pertinent to several recently commissioned, large-scale laser facilities. The dependencies of proton acceleration on electron source parameters including pulse duration, temperature, and flux are independently and systematically evaluated. Proton acceleration is found to depend not only on the source size and peak temperature of the injected electrons but also on the rate of increase for a more physical time-varying temperature. Simulations of a 10 ps, sub-relativistic intensity (8 × 10¹⁷ W/cm²) at 1 μm wavelength laser pulse show that energetic electrons generated within the expanding under-dense laser-produced plasma sustain the proton acceleration for ~20 ps. This results in 15 MeV energy gain of the protons, well above what would be predicted based on conventional intensity scalings or what has been observed with shorter pulses. Using this prolonged acceleration, a scheme consisting of a 1 ps and 10 ps double pulse is shown to further boost proton maximum energy.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-07NA27344; 17-ERD-039

OSTI ID:: 1718995

Alternate ID(s):: OSTI ID: 1463935

Report Number(s):: LLNL-JRNL-750501; 935732; TRN: US2204816

Journal Information:: Physics of Plasmas, Vol. 25, Issue 8; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Title: Computational modeling of proton acceleration with multi-picosecond and high energy, kilojoule, lasers

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