Higher harmonic analyses of the Rossi-α method and application of dynamic mode decomposition for time decay constant determination in a 1D subcritical system

Yamamoto, Toshihiro; Sakamoto, Hiroki

doi:10.1016/j.anucene.2021.108886

Cited by 7 publications

(3 citation statements)

References 30 publications

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“…In the conventional analysis method, following the initial detection, the overall likelihood of detecting a neutron event within the measurement time is expressed in the general format demonstrated in Equation (5). The impact of high modal components can be mitigated by selecting suitable fitting intervals.…”

Section: Theory Of the Lhs-dmd-rossi-alpha Methods 21 The Rossi-alpha...mentioning

confidence: 99%

“…The equation uses c i to denote the amplitude of the i-th mode and e i to denote the time constant of the i-th mode. The first-order mode e 1 in Equation (11) represents the constant component G in Equation (5). Therefore, the second largest eigenvalue α can be used to obtain the fundamental mode component of e 2 .…”

Section: Dynamic Mode Decomposition Methodsmentioning

confidence: 99%

“…Chidong et al [4], focusing on Godiva, conducted a sensitivity analysis on the source strength and channel width in the Rossi-alpha parameter settings through numerical simulation to determine the optimal source strength and channel width for measurements using this model. Yamamoto et al [5], aiming to reduce the uncertainties associated with the traditional Rossi-alpha method, applied the data-driven DMD method to Rossi-alpha measurement data based on a onedimensional plate, constructing a data feature extraction model for an array of 44 detectors. This verified the feasibility of using this method to extract the prompt neutron decay constant, although the requirement for a large number of detectors does not meet practical engineering needs.…”

Section: Introductionmentioning

confidence: 99%

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

Li,

Xie,

Deng

et al. 2024

Energies

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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.

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Section: Theory Of the Lhs-dmd-rossi-alpha Methods 21 The Rossi-alpha...mentioning

confidence: 99%

Section: Dynamic Mode Decomposition Methodsmentioning

confidence: 99%