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Observations of Multiple Nuclear Reaction Histories and Fuel-Ion Species Dynamics in Shock-Driven Inertial Confinement Fusion Implosions

Author(s)
Le, A.; Atzeni, S.; Kwan, T. J. T.; Kagan, G.; Stoeckl, C.; Forrest, C. J.; Glebov, V.; Rinderknecht, H. G.; Amendt, P.; Casey, D. T.; Mancini, R.; Taitano, W. T.; Keenan, B.; Simakov, A. N.; Chacón, L.; Regan, S. P.; Sangster, T. C.; Campbell, E. M.; Sio, Hong Weng; Frenje, Johan A; Gatu Johnson, Maria; Li, Changhao; Parker, Cody E; Kabadi, Neel Vinayak; Bose, Anoushka R.; Seguin, Fredrick Hampton; Petrasso, Richard D; ... Show more Show less
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Abstract
Fuel-ion species dynamics in hydrodynamiclike shock-driven DT³He-filled inertial confinement fusion implosion is quantitatively assessed for the first time using simultaneously measured D³He and DT reaction histories. These reaction histories are measured with the particle x-ray temporal diagnostic, which captures the relative timing between different nuclear burns with unprecedented precision (∼10  ps). The observed 50±10  ps earlier D³He reaction history timing (relative to DT) cannot be explained by average-ion hydrodynamic simulations and is attributed to fuel-ion species separation between the D, T, and ³He ions during shock convergence and rebound. At the onset of the shock burn, inferred ³He/T fuel ratio in the burn region using the measured reaction histories is much higher as compared to the initial gas-filled ratio. As T and ³He have the same mass but different charge, these results indicate that the charge-to-mass ratio plays an important role in driving fuel-ion species separation during strong shock propagation even for these hydrodynamiclike plasmas.
Date issued
2019-01
URI
http://hdl.handle.net/1721.1/120512
Department
Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Plasma Science and Fusion Center
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Sio, H. et al. "Observations of Multiple Nuclear Reaction Histories and Fuel-Ion Species Dynamics in Shock-Driven Inertial Confinement Fusion Implosions." Physical Review Letters 122, 3 (January 2019): 035001 © 2019 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114

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