On the problem of monitoring the neutron parameters of the fast energy amplifier

Behringer, K.; Wydler, P.

doi:10.1016/s0306-4549(99)00005-5

Cited by 35 publications

(6 citation statements)

References 13 publications

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“…Many authors [6,8,[15][16][17][18] theoretically showed that the non-Poisson spallation source enhanced the correlation amplitudes of various reactor noise analyses. Here, we compare the correlation amplitudes obtained from the Feynman-α and Rossiα analyses under the present non-Poisson spallation source with those under the previous Poisson inherent source [2].…”

Section: Comparison Of Correlation Amplitude Between Spallation and Pmentioning

confidence: 99%

Subcriticality

Hashimoto

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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For a subcritical reactor system driven by a periodically pulsed spallation neutron source in KUCA, the Feynman-α and the Rossi-α neutron correlation analyses are conducted to determine the prompt neutron decay constant and quantitatively to confirm a non-Poisson character of the neutron source. The decay constant determined from the present Feynman-α analysis well agrees with that from a previous analysis for the same subcritical system driven by an inherent source. Considering the effect of a higher mode excited, the disagreement can be successfully resolved. The power spectral analysis on frequency domain is also carried out. Not only the cross-power but also the auto-power spectral density have a considerable correlated component even at a deeply subcritical state, where no correlated component could be previously observed under a 14 MeV neutron source. The indicator of the non-Poisson character of the present spallation source can be obtained from the spectral analysis and is consistent with that from the Rossi-α analysis. An experimental technique based on an accelerator-beam trip or restart operation is proposed to determine the subcritical reactivity of ADS. Applying the least-squares inverse kinetics method to the data analysis, the subcriticality can be inferred from time-sequence neutron count data after these operations.

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Section: Comparison Of Correlation Amplitude Between Spallation and Pmentioning

confidence: 99%

Subcriticality

Hashimoto

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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“…In view of the above, several theoretical studies on various noise techniques for ADS [25][26][27][28][29][30][31][32] have appeared of late. In the initial years, the most important difference perceived between critical reactors and ADS [25][26][27][28] was that the spallation reaction would produce a large number of neutrons at the same time in what could be called as a source event. Associated with this reaction, there would be a multiplicity distribution of the number of neutrons and its mean and the second factorial moment.…”

Section: Theoretical Studies On Reactor Noise In Adsmentioning

confidence: 99%

The physics of accelerator driven sub-critical reactors

et al. 2007

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In recent years, there has been an increasing worldwide interest in accelerator driven systems (ADS) due to their perceived superior safety characteristics and their potential for burning actinides and long-lived fission products. Indian interest in ADS has an additional dimension, which is related to our planned large-scale thorium utilization for future nuclear energy generation.The physics of ADS is quite different from that of critical reactors. As such, physics studies on ADS reactors are necessary for gaining an understanding of these systems. Development of theoretical tools and experimental facilities for studying the physics of ADS reactors constitute important aspect of the ADS development program at BARC. This includes computer codes for burnup studies based on transport theory and Monte Carlo methods, codes for studying the kinetics of ADS and sub-critical facilities driven by 14 MeV neutron generators for ADS experiments and development of sub-criticality measurement methods. The paper discusses the physics issues specific to ADS reactors and presents the status of the reactor physics program and some of the ADS concepts under study.

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“…Investigation on the Feynman-alpha technique is still being pursued to cope with a renewed necessity, i.e., subcriticality monitoring for the accelerator-driven system (ADS). Corresponding to two kinds of operation modes of accelerators, i.e., the current mode and the pulse one, the Feynman-alpha techniques for the ADSs with respective operation modes were developed Yamane, 1998, 1999;Behringer and Wydler, 1999;Muñoz-Cobo et al, 2001;Degweker, 2003;Pázsit et al, 2005;Kitamura et al, 2005Kitamura et al, , 2006Degweker and Rana, 2007;Pázsit and Pál, 2008;Rana and Degweker, 2009). However, there is a defect in some Feynman-alpha techniques for the ADS with pulse mode developed so far; their theoretical formulae are disadvantageous in determining the neutron decay constant since they are too complicated owing to the rapid variation of neutron counting rate that is caused by the prompt decaying behaviour of neutron population.…”

Section: Introductionmentioning

confidence: 99%

Theory of Feynman-alpha technique with masking window for accelerator-driven systems

Kitamura

Misawa

2017

Annals of Nuclear Energy

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Recently, a modified Feynman-alpha technique for the subcritical system driven by periodically triggered neutron bursts was developed. One of the main features of this technique is utilization of a simple formula that is advantageous in evaluating the subcriticality. However, owing to the absence of the theory of this technique, this feature has not been fully investigated yet. In the present study, a theory of this technique is provided. Furthermore, the experimental conditions under which the simple formula works are discussed to apply this technique to the subcriticality monitor for the accelerator-driven system.

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On the problem of monitoring the neutron parameters of the fast energy amplifier

Cited by 35 publications

References 13 publications

Subcriticality

Subcriticality

The physics of accelerator driven sub-critical reactors

Theory of Feynman-alpha technique with masking window for accelerator-driven systems

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