Comparison of laser-produced plasma spatio-temporal electron density evolution measured using interferometry with simulation results

Polek, Mathew P.; Joshi, Tirtha R.; Bailly-Grandvaux, Mathieu; Spielman, Rick B.; Beg, Farhat N.; Harilal, Sivanandan S.

doi:10.1063/5.0259020

Comparison of laser-produced plasma spatio-temporal electron density evolution measured using interferometry with simulation results

Journal Article · Wed Mar 26 00:00:00 EDT 2025 · Physics of Plasmas

DOI:https://doi.org/10.1063/5.0259020· OSTI ID:2544192

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Univ. of California, San Diego, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Univ. of Rochester, NY (United States)
Univ. of California, San Diego, CA (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Due to the difficulties associated with experimental measurements of laser-produced plasma (LPP) properties during the earliest stages of plasma evolution, radiation hydrodynamic codes are often used. However, although these codes have been extensively validated in the higher intensity regimes, validation at low to moderate intensities has been limited. In this study, the spatio-temporal electron density evolution in an LPP generated at moderate laser intensities and at various laser wavelengths was validated against the FLASH code for times up to 20 ns. The LPP was generated by focusing the fundamental and various harmonics radiation (1064, 532, and 266 nm) from a 6 ns full width half maximum Nd:YAG laser, at a laser intensity of 10 GW cm^-2, onto a copper target. The spatio-temporal density evolution of the expanding plasma was analyzed using Nomarski interferometry. Experimental measurements were found to be consistent with FLASH simulations, and the dependence of electron densities on wavelength was found to be in agreement with analytical models, varying as n_e ∝ λ^-0.7. However, slight differences were noted in the widths and shape functions of the experimental and simulated electron density profiles.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2544192

Report Number(s):: PNNL-SA--193355

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 32; ISSN 1070-664X

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

Country of Publication:: United States

Language:: English

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Comparison of laser-produced plasma spatio-temporal electron density evolution measured using interferometry with simulation results

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