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An Iterative Monte Carlo Method for Generating Global Weight Window Parameters Based on Particle Density Inhomogeneity

A technology of particle density and uniformity, which is applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of inability to calculate efficiency and optimize weight window generators, achieve accurate and fast particle transportation, and avoid erroneous calculation results , the effect of simplifying the operation

Active Publication Date: 2017-05-24
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

[0007] The technology of the present invention solves the problem: Overcoming the shortcomings of the traditional weight window generator that needs to rely on user experience for optimization and cannot optimize the global calculation efficiency, it provides an iterative Monte Carlo global weight window parameter based on particle density inhomogeneity The generation method, the user does not need to rely on experience to manually debug the weight window, which improves the efficiency of the global Monte Carlo calculation of complex models

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  • An Iterative Monte Carlo Method for Generating Global Weight Window Parameters Based on Particle Density Inhomogeneity
  • An Iterative Monte Carlo Method for Generating Global Weight Window Parameters Based on Particle Density Inhomogeneity
  • An Iterative Monte Carlo Method for Generating Global Weight Window Parameters Based on Particle Density Inhomogeneity

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[0038] The International Thermonuclear Experimental Reactor (ITER) is currently one of the largest international scientific research cooperation projects in the world. The ITER device is a superconducting tokamak capable of producing large-scale nuclear fusion reactions. This patent selects the neutronics model Alite.004 officially released by ITER as a benchmark example. The model used for testing is a 40-degree Alite model with a radius of about 20 meters and a height of about 40 meters. Its radiation source is a complete fusion plasma source.

[0039] For this example, if figure 1 Shown, the embodiment of the present invention is:

[0040] (1) Generate the initial weight window grid. The grid is divided into 100, 100, and 20 parts in the three dimensions of R, Z, and Theta, covering the entire model space. The weight window parameters of each grid are initialized to 0 ;

[0041] (2) In the process of particle transport calculation, for each grid, count the number of par...

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Abstract

The invention discloses an iterative Monte Carlo global weight window parameter generating method based on particle density nonuniformity. The significance of each grid is obtained through calculation according to the contribution of one particle entering the grid to particle density distribution nonuniformity, and weight window parameters are calculated according to the significance of the grid. Meanwhile, the weight window parameters are gradually optimized through self-adaptive iterative calculation, particles are uniformly conveyed to whole model space, and therefore the variance of the global calculation result is reduced. The limitation that a traditional weight window generating method only can optimize the single position variance of model space is avoided, the user does not need to rely on experience to manually adjust a weight window, and the efficiency of complex model Monte Carlo calculation is improved.

Description

technical field [0001] The invention relates to an iterative Monte Carlo global weight window parameter generation method based on particle density inhomogeneity, which belongs to the direction of radiation shielding calculation and analysis in the fields of nuclear physics, nuclear technology application and the like. Background technique [0002] More and more Monte Carlo radiation transport calculations need to obtain the calculation results of global convergence, such as the calculation of the power distribution of the whole reactor of the fission reactor and the calculation of the shutdown dose of the fusion reactor. However, for problems with thick shielding and complex geometry, it is difficult for particles to penetrate the shielded area. If the direct simulation method is used for calculation, not only the statistical error of the shielded area will be much higher than that of other areas, but the calculation time is unacceptable. [0003] Using a grid weight window...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 吴宜灿张澍宋婧郝丽娟孙光耀
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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