A numerical model of a coated capillary-plate thermal neutron collimator

TIAN Yang; YANG Yi-Gang; LI Yu-Lan; LI Yuan-Jing

doi:10.1088/1674-1137/36/5/010

Chinese Physics C> 2012, Vol. 36> Issue(5) : 438-442 DOI: 10.1088/1674-1137/36/5/010

A numerical model of a coated capillary-plate thermal neutron collimator

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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.

References

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TIAN Yang, YANG Yi-Gang, LI Yu-Lan and LI Yuan-Jing. A numerical model of a coated capillary-plate thermal neutron collimator[J]. Chinese Physics C, 2012, 36(5): 438-442. doi: 10.1088/1674-1137/36/5/010

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Received: 2011-08-05
Revised: 2011-08-30

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沈阳化工大学材料科学与工程学院沈阳 110142

A numerical model of a coated capillary-plate thermal neutron collimator

Received Date: 2011-08-05
Accepted Date: 2011-08-30
Available Online: 2012-05-05

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.