Neutron detection with a GEM

Park, Se-Hwan; Kim, Yong Kyun; Kang, Sang Mook; Ha, Jun; Kim, J.K.

doi:10.1109/nssmic.2004.1462246

Cited by 2 publications

(1 citation statement)

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“…Boron-10 is one of the common isotopes used in the neutron conversion, which have high cross-section (∼3840 barns) for the thermal neutron and the natural abundance of about 19.8%. In recent years, considerable efforts have been devoted to the development of GEM detectors with a boron-coated converter [16][17][18][19][20][21]. To satisfy requirements of the neutron detection, a ceramic GEM detector has been developed since 2013 at CSNS.…”

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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