Angular Fokker-Planck decomposition and representation techniques

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Nuclear Science and Engineering; (USA)

OSTI ID:6958823

Landesman, M ^[1]; Morel, J E ^[2]

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1. Louisiana State Univ., Baton Rouge, LA (USA). Nuclear Science Center
2. Los Alamos National Lab., NM (USA)

Two new methods for decomposing scattering cross sections into the forward-peaked and smooth components required for Boltzmann-Fokker-Planck calculations are presented. The first is slightly simpler than existing methods and offers the same level of effectiveness. The second is more expensive than existing methods, but is much more effective. Legendre moments that give a positive representation for the angular Fokker-Planck operator and can be used in standard S{sub n} codes are presented. Computational results are given that demonstrate the effectiveness of these new decomposition and representation techniques.

• OSTI ID: 6958823
• Journal Information: Nuclear Science and Engineering; (USA), Journal Name: Nuclear Science and Engineering; (USA) Vol. 103:1; ISSN 0029-5639; ISSN NSENA
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100 -- Nuclear Reactor Technology-- Theory & Calculation
220400* -- Nuclear Reactor Technology-- Control Systems
ANGULAR DISTRIBUTION
BOLTZMANN EQUATION
CALCULATION METHODS
COMPUTER CODES
CROSS SECTIONS
DIFFERENTIAL EQUATIONS
DISTRIBUTION
EQUATIONS
FOKKER-PLANCK EQUATION
FUNCTIONS
KINETICS
LEGENDRE POLYNOMIALS
PARTIAL DIFFERENTIAL EQUATIONS
POLYNOMIALS
REACTOR COMPONENTS
REACTOR KINETICS