Performance evaluation of the Boron Coated Straws detector with Geant4

Klausz, M.; Kanaki, K.; Zagyvai, P.; Hall-Wilton, R.

doi:10.1016/j.nima.2019.162463

Cited by 10 publications

(5 citation statements)

References 40 publications

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“…These neutrons are not transmitted and are lost from the beam. It should be noted that, experimentally, the difference between scattered and measured neutrons is one of detector geometry, as has been discussed elsewhere [10]. λ is the neutron wavelength.…”

Section: Concept Of Measurementmentioning

confidence: 93%

Parasitic neutron beam monitoring: Proof of concept on gamma monitoring of neutron chopper phases

Issa

Hall-Wilton

Quintanilla

et al. 2020

EPL

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Neutron beam monitors are an essential diagnostic component of neutron scattering facilities. They are used to measure neutron flux, calibrating experiments performed on the instruments, allowing measurement of facility performance, understanding of the effect on the neutrons of beam-line components (such as choppers), calibration of detectors and tracking of beam stability. Ideally beam monitors should not perturb the beam. Previous work shows commercial beam monitors attenuate the beam by a few percent in the worst case due to the 1–2 mm thick aluminium entrance and exit windows and the material inside. Parasitic methods of neutron beam diagnostics, where there is no beam monitor directly in the beam, would be preferable. This paper presents the concept of a parasitic method of monitoring the beam which can be used for neutron chopper phasing. This is achieved by placing a gamma detector close to a rotating chopper and measuring a signal proportional to the flux absorbed by the chopper. Neutrons interact with the boron absorber on the chopper disc leading to gamma emission at 480 keV. Detection of these gamma rays is used to determine the chopper phasing and timing. Potentially information on the flux of the beamline can be extracted. Results from a proof of concept implementation show that diagnosis of neutron chopper phases is feasible.

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Section: Concept Of Measurementmentioning

confidence: 93%

Parasitic neutron beam monitoring: Proof of concept on gamma monitoring of neutron chopper phases

Issa

Hall-Wilton

Quintanilla

et al. 2020

EPL

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“…The LoKi detector modules were intensively tested at ISIS during the R&D and production phases as well as in GEANT4 simulations [46]. The data reduction and analysis, including the position calibration of the straw tubes, is expected to be more complex than for the 3 He-based technologies currently employed on time-of-flight SANS instruments due to the larger number of detection elements arranged in a volume [17].…”

Section: Boron-coated Straw Tubes For Loki (Sans)mentioning

confidence: 99%

10Boron-film-based gas detectors at ESS

Stefanescu,

Guérard,

Hall-Wilton

et al. 2024

JNR

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The development of detectors for the European Spallation Source is an important parallel element to the effort put into the design and construction of the neutron source and instruments. The 10Boron-film-based detector developments that started over a decade ago as basic detector concepts have now reached technical maturity after intense prototyping work and numerous testing campaigns. Several of the ESS beamlines that will soon enter the commissioning phase started welcoming the detector systems built with the 10B-film converter technology. The real-size demonstrators evolved in the last 2–3 years into a diverse suite of gas proportional counters for use in diffraction, reflectometry and small-angle scattering studies in spite of the operational complexity posed by the requirements for large-area coverage, low material budget and robustness for operation in the high-flux and high-radiation environment of ESS. The detectors are now being shipped to ESS or undergoing the last performance and calibration tests before being handed over to the instrument teams for installation in the host beamlines. A common feature of these detector systems is the very large number of readout channels that they are instrumented with in order to fulfill the demanding requirements for sensitivity, spatial resolution and count-rate capability. Across all of the detector types that will operate at ESS, the integration, testing and commissioning of the read-out technologies and software tools for data reduction, calibration and analysis are the focus of the detector and integration teams. These will yield a wealth of knowledge about their operation as well as initial results on the in-situ performance, a very important asset to ensure rapid commissioning of the detectors when neutrons from the ESS source become available. In this paper we will give an overview of the 10B-film-based detector technologies included in the ESS detector suite that are currently facing the transition from the production phase to installation and integration with the other beamline components, which comes with its own specific challenges of both organizational and technical nature.

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“…The boron-coated straw tube structure used in this paper is referenced from the literature (Klausz et al, 2019), a cluster-type straw tube consists of 7 base tubes as shown in Figure 1, each base tube is coated with 1 μM thick 90% 10 B abundance B 4 C on the inner wall, and the tube length is 50 cm. The detector system is referenced from AWCC (Canberra, 2005) for the rest of the dimensional structure except for the detector tube.…”

Section: Simulation Studies Of Neutron Multiplicitymentioning

confidence: 99%

Simulation study of neutron multiplicity of plutonium samples of different shapes

Zhang

Yao

et al. 2022

Front. Energy Res.

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In this paper, an optimized boron-coated straw tube neutron multiplicity counter is used to simulate neutron multiplicity for six different shapes of weapons-grade plutonium samples. It was found that under the point model equation, the mass simulation results for samples of different shapes showed different degrees of negative deviations with increasing mass, and the deviations increased with increasing mass. On this basis, the reasons for the deviation are analyzed and a multilayer perceptron is introduced, and three counting rates and preset qualities of samples of different qualities under six shapes are trained. The results showed that the multi-layer perceptron could better fit the relationship between the counting rates of different shapes and the preset quality. The sparrow search algorithm was introduced to optimize the initial weights and thresholds of the multilayer perceptron, and the optimized model was used to predict another four samples of different shapes. The results show that the optimized multilayer perceptron can better fit the relationship between the counting rate and the mass of samples with different shapes. When the sample mass is less than 3 kg, the relative deviation of the three counting rates for samples with four shapes to the sample mass prediction is less than 2%, which meets the requirements of neutron multiplicity measurement.

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Performance evaluation of the Boron Coated Straws detector with Geant4

Cited by 10 publications

References 40 publications

Parasitic neutron beam monitoring: Proof of concept on gamma monitoring of neutron chopper phases

Parasitic neutron beam monitoring: Proof of concept on gamma monitoring of neutron chopper phases

10Boron-film-based gas detectors at ESS

Simulation study of neutron multiplicity of plutonium samples of different shapes

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