Measurements of an Ablator-Gas Atomic Mix in Indirectly Driven Implosions at the National Ignition Facility
Author(s)Frenje, Johan A.; Gatu Johnson, Maria; Petrasso, Richard D.
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We present the first results from an experimental campaign to measure the atomic ablator-gas mix in the deceleration phase of gas-filled capsule implosions on the National Ignition Facility. Plastic capsules containing CD layers were filled with tritium gas; as the reactants are initially separated, DT fusion yield provides a direct measure of the atomic mix of ablator into the hot spot gas. Capsules were imploded with x rays generated in hohlraums with peak radiation temperatures of ~294 eV. While the TT fusion reaction probes conditions in the central part (core) of the implosion hot spot, the DT reaction probes a mixed region on the outer part of the hot spot near the ablator–hot-spot interface. Experimental data were used to develop and validate the atomic-mix model used in two-dimensional simulations.
DepartmentMassachusetts Institute of Technology. Plasma Science and Fusion Center
Physical Review Letters
American Physical Society
Smalyuk, V. A., R. E. Tipton, J. E. Pino, D. T. Casey, G. P. Grim, B. A. Remington, D. P. Rowley, et al. “Measurements of an Ablator-Gas Atomic Mix in Indirectly Driven Implosions at the National Ignition Facility.” Physical Review Letters 112, no. 2 (January 2014). © 2014 American Physical Society
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