A numerical model of a coated capillary-plate thermal neutron collimator |
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Authors: | TIAN Yang ; YANG Yi-Gang LI Yu-Lan LI Yuan-Jing |
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Institution: | 1,2 1 Department of Engineering Physics, Tsinghua University, Beijing 100084, China 2 Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China |
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Abstract: | A novel thermal neutron collimator was successfully fabricated by coating the inner surface of the capillary plate (CP) with gadolinium oxide using atomic layer deposition (ALD) technology. This CP-based collimator is efficient and compact. A numerical model is presented in the paper to estimate the main performance characteristics of the collimator and to optimize the design for specific applications. According to the results of the calculation based on currently available CPs, the FWHM of the collimator’s rocking curve can be smaller than 0.15 while suppressing more than 99.9% of the incident thermal neutrons on the double wings of the curve. Such a coated CP is as thin as 1.25 mm or even thinner, providing high angular resolution with good transmission in a very limited space. |
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Keywords: | neutron collimator capillary plate atomic layer deposition gadolinium |
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