Impact of the Langdon effect on crossed-beam energy transfer

Turnbull, David; Colaïtis, Arnaud; Hansen, Aaron M.; Milder, Avram L.; Palastro, John P.; Katz, Joseph; Dorrer, Christophe; Kruschwitz, Brian E.; Strozzi, David J.; Froula, Dustin H.

doi:10.1038/s41567-019-0725-z

Title: Impact of the Langdon effect on crossed-beam energy transfer

Journal Article · 02 December 2019 · Nature Physics

DOI: https://doi.org/10.1038/s41567-019-0725-z · OSTI ID:1598486

^[1];

^[2]; Hansen, Aaron M. ^[1]; Milder, Avram L. ^[1]; Palastro, John P. ^[1]; Katz, Joseph ^[1]; Dorrer, Christophe ^[1]; Kruschwitz, Brian E. ^[1]; Strozzi, David J. ^[3];

^[1]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics
National Centre for Scientific Research (CNRS), Talence (France)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

The prediction that laser plasma heating distorts the electron distribution function away from Maxwellian and towards a super-Gaussian distribution dates back four decades. In conditions relevant to inertial confinement fusion, yet, no direct evidence of this so-called “Langdon effect” has previously been observed. Here, measurements of the spatially and temporally resolved Thomson scattering spectrum indicate the presence of super-Gaussian electron distribution functions that are consistent with existing theory. In such plasmas, ion acoustic wave frequencies increase monotonically with the super-Gaussian exponent. Our findings show that the measured power transfer between crossed laser beams mediated by ion acoustic waves requires a model that accounts for the non-Maxwellian electron distribution function, whereas the standard Maxwellian calculations overpredict power transfer over a wide region of parameter space. Including this effect is expected to improve the predictive capability of crossed-beam energy transfer modeling at the National Ignition Facility and may restore a larger operable design space for inertial confinement fusion experiments. Furthermore, this is expected to motivate further inquiry in other areas impacted by non-Maxwellian electron distribution functions, such as laser absorption, heat transport, and x-ray spectroscopy.

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Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003856; AC52-07NA27344

OSTI ID:: 1598486

Alternate ID(s):: OSTI ID: 1755832

Report Number(s):: 2019-67; 1534; 2492; LLNL-JRNL-816067; 2019-67, 1534, 2492; TRN: US2103286

Journal Information:: Nature Physics, Vol. 16, Issue 2; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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