Radiation shielding calculation method based on monte carlo self-adaptive variance reduction

A technology of radiation shielding and calculation methods, applied in calculation, special data processing applications, instruments, etc., can solve the time-consuming problem of repeated debugging of weight window parameters, and achieve the effect of automatic bias

Active Publication Date: 2015-02-25
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

For inexperienced users, it is extremely time-consuming to repeatedly debug the weight window parameters

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  • Radiation shielding calculation method based on monte carlo self-adaptive variance reduction
  • Radiation shielding calculation method based on monte carlo self-adaptive variance reduction
  • Radiation shielding calculation method based on monte carlo self-adaptive variance reduction

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Embodiment Construction

[0040]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 ITER-T426 example question as the application example question. This example is based on the FNG (Frascati neutron generator) device, and a shielding structure composed of stainless steel and plexiglass is designed to simulate the ITER vacuum chamber. The radiation source is a neutron point source with single energy (14MeV) and single direction (0, 1, 0) located at the bottom cell (X=0cm; Y=0.001cm; Z=0cm). The counting area is a stainless steel cylinder with a center point at (X=0cm; Y=74.93cm; Z=0cm), a radius of 1.5cm, and a height of 5cm. The counting type is volume flux calculation.

[0041] (1) Forward calculation of Monte Carlo particle transport to obtain the initial variance re...

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Abstract

The invention discloses a radiation shielding calculation method based on monte carlo self-adaptive variance reduction. Based on a traditional monte carlo method based on weight window variance reduction, according to the specific condition that a deterministic method of the traditional monte carlo method accompanies the flux calculation result, importance parameters are worked out, the parameters are written into an input file of a radiation shielding calculation program based on the monte carlo, and then radiation shielding calculation is conducted. In the process of radiation shielding calculation based on the monte carlo, when the importance parameters obtained in the previous step conduct bias transport on particles while a particle track is stored, that is, lattice cells where all the particles pass are given, a user is helped to automatically interfere with and adjust the set of geometric regional importance parameters in the simulation process, new lattice cell importance parameters are used in the subsequent calculation, and automatic bias is achieved. By means of the radiation shielding calculation method based on monte carlo self-adaptive variance reduction, using of the traditional monte carlo method based on the experimental weight window variance reduction is avoided, and the effects of conducting radiation shielding calculation accurately and rapidly are achieved.

Description

technical field [0001] The invention relates to a radiation shielding calculation method based on Monte Carlo self-adaptive variance reduction, which belongs to the radiation shielding calculation and analysis direction in the fields of nuclear physics, nuclear technology application and the like. Background technique [0002] Radiation shielding analysis is a key link in the physical design and analysis of nuclear installations. The Monte Carlo method has the ability to deal with complex geometries and simulate fine physical processes, so it is more and more widely used in shielding analysis. For problems with thick shielding and complex structures, it is difficult for the simulated particles to penetrate the medium and continue to transport, and it is difficult to count effective particles. Not only is the calculation efficiency unacceptable, but it is also difficult to obtain a convergent solution. The variance reduction method can speed up the convergence speed of the M...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 郑华庆宋婧孙光耀郝丽娟吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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