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

Impact of the Langdon effect on crossed-beam energy transfer

Journal Article · Mon Dec 02 00:00:00 EST 2019 · Nature Physics

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

^[1]; ^[2]; Hansen, Aaron M. ^[3]; Milder, Avram L. ^[3]; Palastro, John P. ^[3]; Katz, Joseph ^[3]; Dorrer, Christophe ^[3]; Kruschwitz, Brian E. ^[3]; Strozzi, David J. ^[4]; ^[3]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
National Centre for Scientific Research (CNRS), Talence (France)
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
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.

View Accepted Manuscript (DOE)

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

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

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

OSTI ID:: 1598486

Alternate ID(s):: OSTI ID: 1755832

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

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

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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