Study of the ion kinetic effects in ICF run-away burn using a quasi-1D hybrid model

Huang, Cheng -Kun; Molvig, Kim; Albright, Brian James; Dodd, Evan S.; Vold, Erik Lehman; Kagan, Grigory; Hoffman, Nelson M.

doi:10.1063/1.4976323

Study of the ion kinetic effects in ICF run-away burn using a quasi-1D hybrid model

Journal Article · Mon Feb 20 23:00:00 EST 2017 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4976323· OSTI ID:1358165

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here, the loss of fuel ions in the Gamow peak and other kinetic effects related to the α particles during ignition, run-away burn, and disassembly stages of an inertial confinement fusion D-T capsule are investigated with a quasi-1D hybrid volume ignition model that includes kinetic ions, fluid electrons, Planckian radiation photons, and a metallic pusher. The fuel ion loss due to the Knudsen effect at the fuel-pusher interface is accounted for by a local-loss model by with an albedo model for ions returning from the pusher wall. The tail refilling and relaxation of the fuel ion distribution are captured with a nonlinear Fokker-Planck solver. Alpha heating of the fuel ions is modeled kinetically while simple models for finite alpha range and electron heating are used. This dynamical model is benchmarked with a 3 T hydrodynamic burn model employing similar assumptions. For an energetic pusher (~40 kJ) that compresses the fuel to an areal density of ~1.07g/cm² at ignition, the simulation shows that the Knudsen effect can substantially limit ion temperature rise in runaway burn. While the final yield decreases modestly from kinetic effects of the α particles, large reduction of the fuel reactivity during ignition and runaway burn may require a higher Knudsen loss rate compared to the rise time of the temperatures above ~25 keV when the broad D-T Gamow peak merges into the bulk Maxwellian distribution.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1358165

Alternate ID(s):: OSTI ID: 1349349

Report Number(s):: LA-UR--16-28067

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 2 Vol. 24; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Yield reduction via the Knudsen layer effect in a mixture of fuel and pusher material McDevitt, Christopher J.; Tang, Xian-Zhu; Guo, Zehua Plasma Physics and Controlled Fusion, Vol. 61, Issue 2 https://doi.org/10.1088/1361-6587/aaee5a	journal	December 2018

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