Evaluation of the spectrum unfolding methodology for neutron activation system of fusion devices

Raj, Prasoon; Bradnam, S.C.; Colling, Bethany; Klix, A.; Majerle, M.; Nobs, C.R.; Packer, L.W.; Pillon, M.; Štefánik, Milan; Contributors, Jet

doi:10.1016/j.fusengdes.2019.02.056

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Two such algorithms that will be used in this paper are maximum-entropy deconvolution (MAXED [10]) and pseudo-inverse. They are chosen because maximum-entropy and linear least-squares algorithms are the two most widely-used algorithms in NAS (as shown in [11]). MAXED is a well-known algorithm employed in many fusion neutron spectra unfolding investigations, including [12][13][14].…”

Section: Theorymentioning

confidence: 99%

Optimising Foil Selection for Neutron Activation Systems

et al. 2022

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Neutron spectrum unfolding using activation foils is currently the primary technique planned for measuring the neutron energy spectrum at the first wall of power-generating fusion reactors. Room for improvement in the effectiveness of current foil selection was identified, and a program produced to select foils procedurally in order to maximise the accuracy of the unfolding procedure. Using Kullback–Leibler Divergence to quantify the accuracy, the spectrum unfolded by the procedurally selected set of foils is found to be more accurate than the spectrum unfolded by a set of foils used in the literature.

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Section: Theorymentioning

confidence: 99%

Optimising Foil Selection for Neutron Activation Systems

et al. 2022

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“…Simply put, an unfolding code adjusts this spectrum so that the reaction rates calculated with this matches the ones measured. At KIT, we have been studying the sensitivity of the resulting flux-spectrum towards the choices of the input a-priori data and the boundary conditions [6]. We have utilized experimental data from JET [7], NPI [5] etc.…”

Section: Spectral-adjustment and Nuclear Datamentioning

confidence: 99%

“…2.5 MeV peak) neutrons at JET, using Al, Cr and Nb foils. The reader is referred to [5,7] for further details of these experiments and to [6] for their spectrum unfolding using two different codes. Table 1 lists all the reactions for unfolding, as produced in the two data sets.…”

Section: Two Analysed Experimental Casesmentioning

confidence: 99%

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Comparative survey of evaluated nuclear data libraries for fusion-relevant neutron activation spectrometry

et al. 2020

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The neutron flux-spectrum in a fusion device is frequently determined with activation foils and adjustment of a guess-spectrum in unfolding codes. Spectral-adjustment being a rather complex and uncertain procedure, we are carefully streamlining and evaluating it for upcoming experiments. Input nuclear cross-section data holds a vital position in this. This paper presents a survey of common dosimetry reactions and available data files relevant for fusion applications. While the IRDFF v1.05 library is the recommended source, many reactions of our interest are found missing in this. We investigated other standard sources: ENDF/B-VIII.0, EAF-2010, TENDL-2017, JENDL-4.0 etc. And, we analysed two experiments to ascertain the sensitivity of the spectral adjustment to the choice of nuclear data. One was performed with D-D (approx. 2.5 MeV peak) neutrons at the Joint European Torus (JET) machine and another with a white neutron field (approx. 33 MeV endpoint energy) at Nuclear Physics Institute (NPI) of Řež. Choice of cross-section source has affected the integral fluxes (<5%), reaction rates (<10%), total fluxes in some sensitive energy-regions (>20%) and individual group fluxes (<30%). Based on this experience, essential qualitative conclusions are made to improve the fusion activation-spectrometry.

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Neutron spectrum unfolding of the magnetic proton recoil spectrometer using the GRAVEL and MLEM algorithms

Zhang

Sheng

et al. 2022

Fusion Engineering and Design

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Evaluation of the spectrum unfolding methodology for neutron activation system of fusion devices

Cited by 5 publications

References 9 publications

Optimising Foil Selection for Neutron Activation Systems

Optimising Foil Selection for Neutron Activation Systems

Comparative survey of evaluated nuclear data libraries for fusion-relevant neutron activation spectrometry

Neutron spectrum unfolding of the magnetic proton recoil spectrometer using the GRAVEL and MLEM algorithms

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