A sealed ceramic GEM-based neutron detector

Zhou, Jingbo; Zhou, Jianrong; Zhou, Xiaojuan; Zhu, L. X.; Wei, Yangdong; Xu, Hong; Guan, Beiju; Wu, Hui-Yin; Wei, Kang; Yang, Jiajia; Wu, Xiaofeng; Yang, Guo Liang; Xie, Y.; Zhang, Yi; Wang, Xiaohu; Ding, B.; Hu, Bitao; Sun, Zhi‐Wei; Duan, Limin; Chen, Yuanbo

doi:10.1016/j.nima.2021.165129

Cited by 10 publications

(9 citation statements)

References 26 publications

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“…The values obtained with the two different techniques result in a spatial resolution compatible with at least 3 mm. This spatial resolution is compatible with the obtained by similar detectors [21,22] and is mostly limited by the fact that our detector uses only five electronic channels, which inherently only allows the estimation of the centroid of the track's charge distribution, which is at a certain distance from the neutron capture position. This distance is minimized when the maximum length of the track is truncated, such as in the case of 2 mm drift.…”

Section: Figuresupporting

confidence: 62%

“…One versatile alternative for neutron detection consists of using one of the referred neutron converter isotopes with the Gas Electron Multiplier (GEM) [13], a microstructure widely used to detect charged particles that can cover large sensitive areas, present fair energy and position resolutions as well as robustness. These aspects consolidated these microstructures, which are already in use in several applications, such as high energy physics [14][15][16], muon tomography [17], X-rays fluorescence imaging [18], and, more recently, neutron detection [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Double-GEM based thermal neutron detector prototype

et al. 2022

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The Helium-3 shortage and the growing interest in neutron science constitute a driving factor in developing new neutron detection technologies. In this work, we report the development of a double-GEM detector prototype that uses a 10B4C layer as a neutron converter material. GEANT4 simulations were performed predicting an efficiency of (3.14 ± 0.10)%, agreeing within 2.7σ with the experimental and analytic detection efficiencies obtained by the detector when tested in a 41.8 meV thermal neutron beam. The detector is position sensitive, equipped with a 256+256 strip readout connected to resistive chains, and achieves a spatial resolution better than 3 mm. The gain stability over time was also measured with a fluctuation of about 0.2% h-1 of the signal amplitude. A simple data acquisition with only 5 electronic channels is sufficient to operate this detector.

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Section: Figuresupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Double-GEM based thermal neutron detector prototype

et al. 2022

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“…Due to the usage of the ceramic substrate whose contents are mainly made of these elements with lower neutron cross-sections, it reveals good radiation resistance and stability, as well as high transmittance for thermal neutrons [22]. Many neutron detectors based on the ceramic GEM with a boron-coated converter have been developed and applied to neutron facilities [23][24][25]. The dynamic measurement range of a neutron detector depends mainly on the detection efficiency and the counting rate capacity.…”

Section: Introductionmentioning

confidence: 99%

A ceramic-GEM neutron detector with a wide neutron-flux measurement range for the beam monitoring at China spallation neutron source

et al. 2023

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The increase of neutron flux in pulsed spallation neutron facilities imposes demands on the neutron detector for beam monitoring, including excellent neutron/gamma discrimination, wide dynamic neutron-flux measurement range, wavelength resolution, and long-term stability. In this paper, we developed a ceramic GEM-based (gas electron multiplier) neutron detector with an active area of 100 mm × 100 mm. It adopted a thinner conversion material and the stopping layer to lower the detection efficiency so as to extend the dynamic measurement range of the detector. The detection efficiency of this detector was investigated by the Monte Carlo (MC) tool FLUKA, showing that the low efficiency around 0.01% for 1 Åneutrons was reached by using a 0.1 μm natB4C converter appended with an aluminum film of 2 μm thickness. Its validation of the wavelength spectra measurement was verified by comparisons with that made with an LND monitor, and it could work at the condition of 7.1 × 109 n/s for 2.5 Åneutrons. In addition, it was demonstrated that this detector was able to measure the beam profile with a position resolution of better than 2.1 ± 0.1 mm. The results of simulations and experiments show that this ceramic-GEM neutron detector can meet the requirements of the direct measurement of high-flux beam, and it will be a new neutron detector for the beam monitoring at the China spallation neutron source (CSNS).

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“…The GEM-based neutron detector using boron as neutron converter has been investigated and developed in last few decade years. [14][15][16][17][18][19][20] The CASCADE neutron detector was developed at Heidelberg University, [15] and has a spatial resolution of 2.6 mm at ambient gas pressure. The sealed ceramic GEM neutron detector was researched at CSNS, [20] and has a spatial resolution of 2.7 mm.…”

Section: Introductionmentioning

confidence: 99%

“…[14][15][16][17][18][19][20] The CASCADE neutron detector was developed at Heidelberg University, [15] and has a spatial resolution of 2.6 mm at ambient gas pressure. The sealed ceramic GEM neutron detector was researched at CSNS, [20] and has a spatial resolution of 2.7 mm. There were some methods to improve spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

A stopping layer concept to improve the spatial resolution of gas-electron-multiplier neutron detector

Zhou¹,

Zhou²,

Zhou³

et al. 2022

Chinese Phys. B

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In recent years, Gas Electron Multiplier (GEM) neutron detector has been developing towards high spatial resolution and high dynamic counting range. A novel concept of the Al stopping layer was proposed to enable the detector to achieve sub-millimeter (sub-mm) spatial resolution. The neutron conversion layer was coated with the Al stopping layer to limit the emission angle of ions into the drift region. The short track projection of ions was obtained on the signal readout board, and the detector would get good spatial resolution. The spatial resolutions of the GEM neutron detector with Al stopping layer were simulated and optimized based on Geant4GarfieldInterface. When Al stopping layer was 3.0 μm thick, drift region was 2 mm thick, strip pitch was 600 μm, and digital readout was employed. The spatial resolution of the detector was 0.76 mm, and the thermal neutron detection efficiency was about 0.01%. Thus, the GEM neutron detector with a simple detector structure and a fast readout mode was developed to obtain a high spatial resolution and high dynamic counting range. It could be used for the direct measurement of a high-flux neutron beam, such as Bragg transmission imaging, very small-angle scattering neutron detection and neutron beam diagnostic.

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A sealed ceramic GEM-based neutron detector

Cited by 10 publications

References 26 publications

Double-GEM based thermal neutron detector prototype

Double-GEM based thermal neutron detector prototype

A ceramic-GEM neutron detector with a wide neutron-flux measurement range for the beam monitoring at China spallation neutron source

A stopping layer concept to improve the spatial resolution of gas-electron-multiplier neutron detector

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