Numerical simulation of statistical fluctuations in measurements of neutron multiplication coefficients on a critical power assembly

Fu Lan; Zhang Jianhua; Yang Gaozhao; Guo Hongsheng

doi:10.3788/HPLPB20132508.2117

Volume 25 Issue 08

Nov. 2013

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Article Navigation > High Power Laser and Particle Beams > 2013 > 25(08): 2117-2120

Xu Degang, Jiang Hao, Zhang Hao, et al. Miniature tunable extracavity terahertz parametric oscillator[J]. High Power Laser and Particle Beams, 2013, 25: 1465-1468. doi: 10.3788/HPLPB20132506.1465

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Fu Lan, Zhang Jianhua, Yang Gaozhao, et al. Numerical simulation of statistical fluctuations in measurements of neutron multiplication coefficients on a critical power assembly[J]. High Power Laser and Particle Beams, 2013, 25: 2117-2120. doi: 10.3788/HPLPB20132508.2117

Xu Degang, Jiang Hao, Zhang Hao, et al. Miniature tunable extracavity terahertz parametric oscillator[J]. High Power Laser and Particle Beams, 2013, 25: 1465-1468. doi: 10.3788/HPLPB20132506.1465

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Numerical simulation of statistical fluctuations in measurements of neutron multiplication coefficients on a critical power assembly

doi: 10.3788/HPLPB20132508.2117

1.
Institute of Nuclear Physics and Chemistry,CAEP,P.O.Box 919-212,Mianyang 621900,China

Received Date: 2013-05-02
Rev Recd Date: 2013-05-23
Publish Date: 2013-06-19

Abstract

Abstract

A computational model of the neutron multiplication coefficient ( value) of a critical power assembly is built, which is measured by current-mode detectors formed by scintillators and photomultiplier tubes (PMTs). Through producing ideal functions and setting up various kinds of fluctuation errors, we numerical simulate the effects of statistical fluctuations in measurements of the values. The results indicate that precision of measuring the values will be influenced by statistical fluctuations of the measured signals. Considering the influence of statistical fluctuations, the number of the incident particles to the detectors surface must reach a certain value in order to make the value satisfy the measurement requirements. Thus the initial intensity of the incident particles must meet different requirements for different measuring time intervals, which can be increased while the initial intensity cannot meet the requirement. When the exponential signal carries random fluctuations with it, a larger time interval for maintaining the values will effectively attenuate the influence of statistical fluctuations.
- critical power assembly,
- neutron multiplication coefficient,
- statistical fluctuation,
- numerical simulation

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