Experimental validation of the brightness distribution on the surfaces of coupled and decoupled moderators composed of 99.8% parahydrogen at the J-PARC pulsed spallation neutron source

Harada, Masahide; Teshigawara, Makoto; Ohi, Motoki; Klinkby, E. B.; Zanini, L.; Batkov, K. E.; Oikawa, Kenichi; Toh, Y.; Kimura, A.; Ikeda, Yujiro

doi:10.1016/j.nima.2018.06.011

Cited by 13 publications

(5 citation statements)

References 43 publications

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“…A similar figure was calculated for the coupled parahydrogen volume moderator at J-PARC [18]. This non-uniform brightness distribution has been experimentally confirmed by a brightness map measurement of the J-PARC coupled moderator [19]. Our calculations show that the effect is much less pronounced for the 3 cm moderator, and almost cancelled for the 1.5 cm one.…”

Section: Physics Effects 231 Parahydrogensupporting

confidence: 84%

See 1 more Smart Citation

Design of the cold and thermal neutron moderators for the European Spallation Source

Zanini¹,

Andersen²,

Batkov³

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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Section: Physics Effects 231 Parahydrogensupporting

confidence: 84%

“…Figure19. Relative change in thermal and cold brightness as a function of the premoderator radius, for two configurations, in which the ring outside the premoderator (with inner radius equal to the premoderator radius, and outer radius of 60 cm) is void, or beryllium with 30 vol% water.…”

mentioning

confidence: 99%

Design of the cold and thermal neutron moderators for the European Spallation Source

Zanini¹,

Andersen²,

Batkov³

et al. 2019

Nuclear Instruments and Methods in Physics Research Section A:

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“…11b ranges from about 1 to 5.5 Å, and the peak is around 2.5 Å. The apparent valley points on the spectrum curve correspond to the reference values of aluminum main Bragg edges [32], which are originated from the neutron interaction with the detector shell, more precisely, the 0.5-mmthick aluminum window. The detected positions of Bragg edges are almost the same as the standard ones, which demonstrates the correctness and the high precision of the TOF measurement.…”

Section: Resultsmentioning

confidence: 90%

A Novel Method to Improve the Spatial Resolution of GEM Neutron Detectors With a Stopping Layer

Yang

Zhou

et al. 2022

IEEE Trans. Nucl. Sci.

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The gas electron multiplier (GEM) detector in combination with a solid converter has been widely used in the field of neutron detection in recent decades. Typically, the sub-millimeter is an important indicator for neutron detectors to satisfy many applications requiring a high spatial resolution. This paper proposes a novel method to improve the spatial resolution of ceramic GEM detectors by adding a stopping layer on top of the solid 10 B4C neutron converter. This will restrict the emission of the secondary ion products of large angles and consequently improve the spatial resolution. The Monte Carlo program FLUKA is used to validate the method, and the verification experiments are carried out at the beam line #20 (BL20) of the China Spallation Neutron Source (CSNS). The experimental results are approximately in agreement with the simulations. The measured spatial resolution is 1.61 mm for the GEM neutron detector operated at ambient pressure with a 1-μm-thick 10 B4C converter, and it is improved to ~0.8 mm by coating a 3-μm-thick titanium on top of the 10 B4C converter.

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“…These results were almost in accordance with those in refs. [24,25]. This demonstrates that the detector could flexibly adjust the FOV and spatial resolution, and can be used for the Bragg edge imaging.…”

Section: Jinst 19 P01015mentioning

confidence: 86%

An energy resolved neutron imaging detector based on boron doped nMCP coupled with a time stamping optical camera

Tan,

Song,

Zhou

et al. 2024

J. Inst.

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Energy resolved neutron imaging has developed rapidly due to its advantage on testing the inner structure of crystal samples. Neutron detector is one of the key components to determine the imaging results quality. The neutron sensitive microchannel plate (nMCP) has been widely used in energy resolved neutron imaging experiments because of the high spatial and timing resolution. However, the ability to adjust field-of-view (FOV) and spatial resolution has not been realized in the nMCP detector, which is an attractive capability in energy resolved neutron imaging experiments. In this paper, an energy resolved neutron imaging detector was developed by coupling nMCP with a time stamping camera. The neutrons were absorbed by nMCP and converted into light through a phosphor screen. Then the light was focused on the camera by optical lens. A data algorithm was designed to improve the data quality. By changing the magnification of the optical lens, large FOV (46mm diameter) and high spatial resolution (26 μm) were realized in the experiments at CSNS beamline 20. The energy resolved ability was demonstrated by a Bragg-edge transmission imaging experiment for aluminum and stainless-steel samples. The performance of this detector makes it a promising candidate used in energy resolved neutron imaging.

show abstract

Experimental validation of the brightness distribution on the surfaces of coupled and decoupled moderators composed of 99.8% parahydrogen at the J-PARC pulsed spallation neutron source

Cited by 13 publications

References 43 publications

Design of the cold and thermal neutron moderators for the European Spallation Source

Design of the cold and thermal neutron moderators for the European Spallation Source

A Novel Method to Improve the Spatial Resolution of GEM Neutron Detectors With a Stopping Layer

An energy resolved neutron imaging detector based on boron doped nMCP coupled with a time stamping optical camera

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