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Title: An Improved Charged Particle Model in CALEICF

Abstract

Modeling ICF capsules and test problems involving thermonuclear plasmas requires modeling the charged particles produced by the thermonuclear reactions. The charged particles escaping from an ICF capsule are one of the main diagnostics of capsule performance. Caleicf can locally deposit the charged particle energy into the electron and ion fields instantaneously or track them using a Monte Carlo algorithm. Test problems revealed that Caleicf's charged particle package needed improvement. The package has been enhanced to include the thermal energy of the reacting particles and to model the created particles energy distribution. The thermal energy of the reacting particles is accounted for as described in Ballabio, et al. [Ballabio et al., 1998] and Warshaw [Warshaw, 2001] . This energy is removed from the background ion energy and distributed between the created particles. The particle energy distributions are modeled with an approximation used by Ballabio, et al. This distribution is a modified Gaussian (based on the square root of the energy) that has a functional form similar to the exact distribution (see Warshaw). The skewness of the distribution matches that of the exact distribution within 1-2%. The thermal energy and the parameters of the distribution can be calculated using ({sigma}{nu}) and itsmore » first two derivatives with respect to temperature. The new model will be compared with the original one for several test problems and ICF calculations.« less

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
900089
Report Number(s):
UCRL-CONF-227316
TRN: US0702163
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Nuclear Explosives Code Developers Conference 2006, Los Alamos, NM, United States, Oct 23 - Oct 27, 2006
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; APPROXIMATIONS; ASYMMETRY; CHARGED PARTICLES; DISTRIBUTION; ELECTRONS; ENERGY SPECTRA; FUNCTIONALS; NUCLEAR EXPLOSIVES; PERFORMANCE; SIMULATION; STATISTICS; THERMONUCLEAR REACTIONS

Citation Formats

Managan, R A. An Improved Charged Particle Model in CALEICF. United States: N. p., 2007. Web.
Managan, R A. An Improved Charged Particle Model in CALEICF. United States.
Managan, R A. Wed . "An Improved Charged Particle Model in CALEICF". United States. doi:. https://www.osti.gov/servlets/purl/900089.
@article{osti_900089,
title = {An Improved Charged Particle Model in CALEICF},
author = {Managan, R A},
abstractNote = {Modeling ICF capsules and test problems involving thermonuclear plasmas requires modeling the charged particles produced by the thermonuclear reactions. The charged particles escaping from an ICF capsule are one of the main diagnostics of capsule performance. Caleicf can locally deposit the charged particle energy into the electron and ion fields instantaneously or track them using a Monte Carlo algorithm. Test problems revealed that Caleicf's charged particle package needed improvement. The package has been enhanced to include the thermal energy of the reacting particles and to model the created particles energy distribution. The thermal energy of the reacting particles is accounted for as described in Ballabio, et al. [Ballabio et al., 1998] and Warshaw [Warshaw, 2001] . This energy is removed from the background ion energy and distributed between the created particles. The particle energy distributions are modeled with an approximation used by Ballabio, et al. This distribution is a modified Gaussian (based on the square root of the energy) that has a functional form similar to the exact distribution (see Warshaw). The skewness of the distribution matches that of the exact distribution within 1-2%. The thermal energy and the parameters of the distribution can be calculated using ({sigma}{nu}) and its first two derivatives with respect to temperature. The new model will be compared with the original one for several test problems and ICF calculations.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Jan 10 00:00:00 EST 2007},
month = {Wed Jan 10 00:00:00 EST 2007}
}

Conference:
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