Spherical implosions in Inertial Confinement Fusion (ICF) are inherently sensitive to perturbations that may arise from experimental constraints and errors. Control and mitigation of low-mode (long wavelengths) perturbations is a key milestone to improving implosion performances. Here, we present the first 3-D radiation-hydrodynamic simulations of directly driven ICF implosions with an inline package for polarized Crossed-Beam Energy Transfer (CBET). Simulations match bang times, yields (separately accounting for laser-induced high modes and fuel age), hot spot flow velocities and direction, for which polarized CBET contributes to the systematic flow orientation evident in the OMEGA implosion database. Current levels of beam mispointing, imbalance, target offset and asymmetry from polarized CBET degrade yields by more than 40%. The effectiveness of two mitigation strategies for low-modes is explored.
Colaïtis, Arnaud, Turnbull, D. P., Igumenschev, I. V., Edgell, D., Shah, R. C., Mannion, O. M., Stoeckl, C., Jacob-Perkins, D., Shvydky, A., Janezic, R., Kalb, A., Cao, D., Forrest, C. J., Kwiatkowski, J., Regan, S., Theobald, W., Goncharov, V. N., & Froula, D. H. (2022). 3D Simulations Capture the Persistent Low-Mode Asymmetries Evident in Laser-Direct-Drive Implosions on OMEGA. Physical Review Letters, 129(9). https://doi.org/10.1103/physrevlett.129.095001
@article{osti_1885764,
author = {Colaïtis, Arnaud and Turnbull, D. P. and Igumenschev, I. V. and Edgell, D. and Shah, R. C. and Mannion, O. M. and Stoeckl, C. and Jacob-Perkins, D. and Shvydky, A. and Janezic, R. and others},
title = {3D Simulations Capture the Persistent Low-Mode Asymmetries Evident in Laser-Direct-Drive Implosions on OMEGA},
annote = {Spherical implosions in Inertial Confinement Fusion (ICF) are inherently sensitive to perturbations that may arise from experimental constraints and errors. Control and mitigation of low-mode (long wavelengths) perturbations is a key milestone to improving implosion performances. Here, we present the first 3-D radiation-hydrodynamic simulations of directly driven ICF implosions with an inline package for polarized Crossed-Beam Energy Transfer (CBET). Simulations match bang times, yields (separately accounting for laser-induced high modes and fuel age), hot spot flow velocities and direction, for which polarized CBET contributes to the systematic flow orientation evident in the OMEGA implosion database. Current levels of beam mispointing, imbalance, target offset and asymmetry from polarized CBET degrade yields by more than 40%. The effectiveness of two mitigation strategies for low-modes is explored.},
doi = {10.1103/physrevlett.129.095001},
url = {https://www.osti.gov/biblio/1885764},
journal = {Physical Review Letters},
issn = {ISSN 0031-9007},
number = {9},
volume = {129},
place = {United States},
publisher = {American Physical Society (APS)},
year = {2022},
month = {08}}
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 964https://doi.org/10.1016/j.nima.2020.163774