In:
Journal of Instrumentation, IOP Publishing, Vol. 18, No. 01 ( 2023-01-01), p. P01033-
Abstract:
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 nat B 4 C 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 × 10 9 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).
Type of Medium:
Online Resource
ISSN:
1748-0221
DOI:
10.1088/1748-0221/18/01/P01033
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2023
detail.hit.zdb_id:
2235672-1
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