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Observation of Hydrodynamic Flows in Imploding Fusion Plasmas on the National Ignition Facility

D. J. Schlossberg, G. P. Grim, D. T. Casey, A. S. Moore, , , L. R. Benedetti, R. M. Bionta, M. J. Eckart, J. E. Field,
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Published: 13 September 2021

Abstract: Inertial confinement fusion implosions designed to have minimal fluid motion at peak compression often show significant linear flows in the laboratory, attributable per simulations to percent-level imbalances in the laser drive illumination symmetry. We present experimental results which intentionally varied the mode 1 drive imbalance by up to 4% to test hydrodynamic predictions of flows and the resultant imploded core asymmetries and performance, as measured by a combination of DT neutron spectroscopy and high-resolution x-ray core imaging. Neutron yields decrease by up to 50%, and anisotropic neutron Doppler broadening increases by 20%, in agreement with simulations. Furthermore, a tracer jet from the capsule fill-tube perturbation that is entrained by the hot-spot flow confirms the average flow speeds deduced from neutron spectroscopy.
Keywords: flows / fusion / imbalance / imploded / hydrodynamic / drive / neutron spectroscopy / Inertial confinement / Neutron yields

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