Anomalous Absorption by the Two-Plasmon Decay Instability

Turnbull, D.; Maximov, A. V.; Edgell, D. H.; Seka, W.; Follett, R. K.; Palastro, J. P.; Cao, D.; Goncharov, V. N.; Stoeckl, C.; Froula, D. H.

doi:10.1103/PhysRevLett.124.185001

Anomalous Absorption by the Two-Plasmon Decay Instability

Journal Article · Tue May 05 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.185001· OSTI ID:1618431

^[1]; Maximov, A. V. ^[2]; Edgell, D. H. ^[2]; Seka, W. ^[2]; Follett, R. K. ^[2]; Palastro, J. P. ^[2]; ^[2]; Goncharov, V. N. ^[2]; Stoeckl, C. ^[2]; Froula, D. H. ^[2]

Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Laboratory for Laser Energetics, University of Rochester
Univ. of Rochester, NY (United States). Lab. for Laser Energetics

Radiation-hydrodynamic simulations of directly driven fusion experiments at the Omega Laser Facility predict absorption accurately when targets are driven at low overlapped laser intensity. Discrepancies appear at increased intensity, however, with higher-than-expected laser absorption on target. Strong correlations with signatures of the two-plasmon decay (TPD) instability—including half-harmonic and hard-x-ray emission—indicate that TPD is responsible for this anomalous absorption. Scattered light data suggest that up to

\approx 30 %

of the laser power reaching quarter-critical density can be absorbed locally when the TPD threshold is exceeded. A scaling of absorption versus TPD threshold parameter was empirically determined and validated using the laser–plasma simulation environment code.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Rochester, NY (United States). Lab. for Laser Energetics

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

Grant/Contract Number:: NA0003856

OSTI ID:: 1618431

Report Number(s):: 2019--310, 1565, 2521; 2019-310, 1565, 2521

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 124; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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