skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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/cm 2 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 maymore » 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.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1358165
Alternate Identifier(s):
OSTI ID: 1349349
Report Number(s):
LA-UR-16-28067
Journal ID: ISSN 1070-664X
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 2; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Huang, Cheng -Kun, Molvig, Kim, Albright, Brian James, Dodd, Evan S., Vold, Erik Lehman, Kagan, Grigory, and Hoffman, Nelson M.. Study of the ion kinetic effects in ICF run-away burn using a quasi-1D hybrid model. United States: N. p., 2017. Web. doi:10.1063/1.4976323.
Huang, Cheng -Kun, Molvig, Kim, Albright, Brian James, Dodd, Evan S., Vold, Erik Lehman, Kagan, Grigory, & Hoffman, Nelson M.. Study of the ion kinetic effects in ICF run-away burn using a quasi-1D hybrid model. United States. doi:10.1063/1.4976323.
Huang, Cheng -Kun, Molvig, Kim, Albright, Brian James, Dodd, Evan S., Vold, Erik Lehman, Kagan, Grigory, and Hoffman, Nelson M.. Tue . "Study of the ion kinetic effects in ICF run-away burn using a quasi-1D hybrid model". United States. doi:10.1063/1.4976323. https://www.osti.gov/servlets/purl/1358165.
@article{osti_1358165,
title = {Study of the ion kinetic effects in ICF run-away burn using a quasi-1D hybrid model},
author = {Huang, Cheng -Kun and Molvig, Kim and Albright, Brian James and Dodd, Evan S. and Vold, Erik Lehman and Kagan, Grigory and Hoffman, Nelson M.},
abstractNote = {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.},
doi = {10.1063/1.4976323},
journal = {Physics of Plasmas},
number = 2,
volume = 24,
place = {United States},
year = {Tue Feb 21 00:00:00 EST 2017},
month = {Tue Feb 21 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

Save / Share: