Research on the Measurement Method of the Prompt Neutron Decay Constant Based on LHS-DMD-Rossi-Alpha

Junguang Li, Jinsen Xie (), Nianbiao Deng, Erpin Zhang, Zhiqiang Wu, Ji Tong and Tao Yu ()
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Junguang Li: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Jinsen Xie: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Nianbiao Deng: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Erpin Zhang: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Zhiqiang Wu: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Ji Tong: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China
Tao Yu: School of Nuclear Science and Technology, University of South China, Hengyang 421001, China

Energies, 2024, vol. 17, issue 9, 1-13

Abstract: In response to the significant dependency on empirical judgment in measuring the prompt neutron decay constant with the traditional Rossi-alpha method and the issue of requiring an excessive number of detectors with the DMD-Rossi-alpha method, this paper introduces a calculation method for the prompt neutron decay constant based on a combination of Latin Hypercube Sampling (LHS), Dynamic Mode Decomposition (DMD), and the Rossi-alpha method. Initially, the method uses LHS to expand the sample dataset of neutron noise data to reduce the number of detectors required. It then employs the Rossi-alpha method to construct a Rossi-alpha distribution model from neutron noise data. Finally, it utilizes DMD for feature extraction from the Rossi-alpha distribution model, thereby determining the prompt neutron decay constant. Research findings demonstrate that, by simulating the KUCA facility using RMC3.5 in a near-critical state, the relative error of the α value calculated by the LHS-DMD-Rossi-alpha method model is 9% less than that calculated by the Rossi-alpha method. This approach, capable of enhancing the precision of measuring the prompt neutron decay constant with just a single detector, holds significant theoretical value and engineering significance for the advancement of reactor physics and experimental techniques.

Keywords: Rossi-alpha method; dynamic mode decomposition; neutron noise analysis; Latin Hypercube sampling; prompt neutron decay constant (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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