Testing of tritium breeder blanket activation foil spectrometer during JET operations

Colling, Bethany; Batistoni, P.; Bradnam, S.C.; Ghani, Z.; Gilbert, Mark R.; Nobs, C.R.; Packer, L.W.; Pillon, M.; Popovichev, S.; Contributors, Jet

doi:10.1016/j.fusengdes.2018.02.005

Cited by 9 publications

(8 citation statements)

References 10 publications

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“…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]. It maximises the the entropy S as a function of / sol.…”

Section: Theorymentioning

confidence: 99%

“…A set of foils (set C) was chosen using the foil-selector program and compared against another set of foils (set D) used in a fusion-neutron-spectrum unfolding experiment [12]. To ensure a fair comparison set C was chosen to have the same number of foils (3) as set D. The compositions and detectable products of both foil sets are listed in Tables 3 and 4.…”

Section: Unfolding a Fusion Neutron Spectrummentioning

confidence: 99%

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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%

Section: Unfolding a Fusion Neutron Spectrummentioning

confidence: 99%

Optimising Foil Selection for Neutron Activation Systems

et al. 2022

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“…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. for this purpose.…”

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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