Actions for Evaluation of three Monte Carlo estimation schemes for flux at a point

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Evaluation of three Monte Carlo estimation schemes for flux at a point

Author
Kalli, H. J.
Published
United States : [publisher not identified], 1977.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1977.
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Cashwell, E. D.

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Summary
Three Monte Carlo estimation schemes were studied to avoid the difficulties caused by the (1/r/sup 2/) singularity in the expression of the normal next-event estimator (NEE) for the flux at a point. A new, fast, once-more collided flux estimator (OMCFE) scheme, based on a very simple probability density function (p.d.f.) of the distance to collision in the selection of the intermediate collision points, is proposed. This kind of p.d.f. of the collision distance is used in two nonanalog schemes using the NEE. In these two schemes, which have principal similarities to some schemes proposed earlier in the literature, the (1/r/sup 2/) singularity is canceled by incorporating the singularity into the p.d.f. of the collision points. This is achieved by playing a suitable nonanalog game in the neighborhood of the detector points. The three schemes were tested in a monoenergetic, homogeneous infinite-medium problem, then were evaluated in a point-cross-section problem by using the Monte Carlo code MCNG. 10 figures.
Report Numbers
LA-6865-MS
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
DOE contract number: W-7405-ENG-36
OSTI Identifier 7280869
Research organization: Los Alamos National Lab. (LANL), Los Alamos, NM (United States).
View MARC record | catkey: 47073021