In-beam test of the Boron-10 Multi-Grid neutron detector at the IN6 time-of-flight spectrometer at the ILL

Birch, Jens; Buffet, J.C.; Clergeau, J.F.; Correa, Jonathan; Esch, Patrick van; Ferraton, M.; Guérard, B.; Halbwachs, J. L.; Hall-Wilton, R.; Hultman, Lars; Höglund, Carina; Khaplanov, A.; Koza, Michael Marek; Piscitelli, F.; Zbiri, M.

doi:10.1088/1742-6596/528/1/012040

Cited by 21 publications

(25 citation statements)

References 4 publications

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“…A promising technique is based on solid converter layers ( 10 B, Gd) and either gas proportional counter or solid state material as the sensing medium. Some examples that employ 10 B are: the Multi-Grid [13][14][15][16], the Multi-Blade [17][18][19], the Jalousie detector [20], BandGEM [21,22], the Boron-coated straw-tubes [23] and CASCADE [24]. Other technologies are based on Gd, e.g., the Gd-GEM [25,26], and a whole branch dedicated to the development of solid state neutron detectors coupled with Gadolinium as a converter layer [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Fast neutron sensitivity for 3He detectors and comparison with Boron-10 based neutron detectors

et al. 2019

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The 3 He-based neutron detectors are no longer the default solution for neutron scattering applications. Both the inability of fulfilling the requirements in performance, needed for the new instruments, and the shortage of 3 He, drove a series of research programs aiming to find new technologies for neutron detection. The characteristics of the new detector technologies have been extensively tested to prove their effectiveness with respect to the state-of-the-art technology.Among these, the background rejection capability is crucial to determine. The signal-to-background ratio is strongly related to the performance figure-of-merit for most instruments. These are designed to exploit the high flux expected from the new high intensity neutron sources. Therefore, an inadequate background rejection could significantly affect the measurements, leading to detector saturation and misleading events. This is of particular importance for the kind of techniques in which the signals are rather weak.For the first time, the sensitivity of 3 He detectors to fast neutrons, up to E n = 10 MeV, has been estimated. Two independent measurements are presented: a direct calculation based on a subtraction method used to disentangle the thermal and the fast neutron contribution, while a further evidence is calculated indirectly through a comparison with the recently published data from a 10 B-based detector. Both investigations give a characterization on the order of magnitude for the sensitivity. A set of simulations is presented as well in order to support and to validate the results of the measurements. A sensitivity of 4 · 10 −3 is observed from the data. This is two orders of magnitude higher than that previously observed in 10 B-based detectors.

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Section: Introductionmentioning

confidence: 99%

Fast neutron sensitivity for 3He detectors and comparison with Boron-10 based neutron detectors

et al. 2019

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“…We therefore expect that detection of scattered neutrons will appear in measurements on the neutron energy loss side of the elastic peak. This effect is expected and was first observed in the measurement on the IN6 demonstrator [15]. On CNCS, we were able to investigate it in more detail, since the energy of incoming neutrons can be freely selected on CNCS, including energies immediately adjacent to the Bragg edge.…”

Section: Aluminium Bragg Edgementioning

confidence: 64%

“…Alpha-particle emissions from the grid materials contribute directly to background in the same energy range as neutron conversions. Therefore we expect 2 orders of magnitude better background than in case of standard Al, as for example in our test at the IN6 spectrometer at the ILL [15]. The non-coated elements of the grids were manufactured from a standard Al (5000-series) and plated with 25 µm of Ni.…”

Section: Multi-grid Detector For the Cncs Test Mgcncsmentioning

confidence: 89%

“…The Multi-Grid technology has previously been extensively characterised in test setups [1,2,[15][16][17][18], however, a test at an operational instrument was much preferred in order to fully compare the new technology to the more familiar 3 He. A test was agreed to be performed at CNCS at SNS in Oak Ridge National Laboratory, for which a new Multi-Grid detector was designed and installed on the existing instrument directly adjacent to the current 3 He detectors.…”

Section: The Test Of the Multi-grid Detectormentioning

confidence: 99%

“…Several of these measurements are only possible on a ToF instrument and are not accessible in lab source or continuous beam tests that have been done previously. This experiment follows an earlier test on the IN6 spectrometer at the ILL, where a Multi-Grid prototype was operated in the instrument for 2 weeks [15]. The current study is the first where an Multi-Grid detector has been operated continuously for over half a year in constant conditions and no access to the detector, other than via the remote retrieval of data.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Grid detector for neutron spectroscopy: results obtained on time-of-flight spectrometer CNCS

Anastasopoulos

Bebb

Berry³

et al. 2017

J. Inst.

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A : The Multi-Grid detector technology has evolved from the proof-of-principle and characterisation stages. Here we report on the performance of the Multi-Grid detector, the MG.CNCS prototype, which has been installed and tested at the Cold Neutron Chopper Spectrometer, CNCS at SNS. This has allowed a side-by-side comparison to the performance of 3 He detectors on an operational instrument. The demonstrator has an active area of 0.2 m 2 . It is specifically tailored to the specifications of CNCS. The detector was installed in June 2016 and has operated since then, collecting neutron scattering data in parallel to the He-3 detectors of CNCS. In this paper, we present a comprehensive analysis of this data, in particular on instrument energy resolution, rate capability, background and relative efficiency. Stability, gamma-ray and fast neutron sensitivity have also been investigated. The effect of scattering in the detector components has been measured and provides input to comparison for Monte Carlo simulations. All data is presented in comparison to that measured by the 3 He detectors simultaneously, showing that all features recorded by one detector are also recorded by the other. The energy resolution matches closely. We find that the Multi-Grid is able to match the data collected by 3 He, and see an indication of a considerable advantage in the count rate capability. Based on these results, we are confident that the Multi-Grid detector will be capable of producing high quality scientific data on chopper spectrometers utilising the unprecedented neutron flux of the ESS.

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Neutron activation and prompt gamma intensity in Ar/CO 2 -filled neutron detectors at the European Spallation Source

Dian

Kanaki

Hall-Wilton

et al. 2017

Applied Radiation and Isotopes

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Monte Carlo simulations using MCNP6.1 were performed to study the effect of neutron activation in Ar/CO neutron detector counting gas. A general MCNP model was built and validated with simple analytical calculations. Simulations and calculations agree that only the Ar activation can have a considerable effect. It was shown that neither the prompt gamma intensity from theAr neutron capture nor the produced Ar activity have an impact in terms of gamma dose rate around the detector and background level.

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In-beam test of the Boron-10 Multi-Grid neutron detector at the IN6 time-of-flight spectrometer at the ILL

Cited by 21 publications

References 4 publications

Fast neutron sensitivity for 3He detectors and comparison with Boron-10 based neutron detectors

Fast neutron sensitivity for 3He detectors and comparison with Boron-10 based neutron detectors

Multi-Grid detector for neutron spectroscopy: results obtained on time-of-flight spectrometer CNCS

Neutron activation and prompt gamma intensity in Ar/CO 2 -filled neutron detectors at the European Spallation Source

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