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Analysis of the Transmission Characteristics for a Neutron Guide
New Phys.: Sae Mulli 2018; 68: 269~278
Published online March 30, 2018;
© 2018 New Physics: Sae Mulli.

Jeong-Soo LEE*

Korea Atomic Energy Research Institute, Neutron Science Center, Daejeon 34057, Korea
Correspondence to:
Received December 13, 2017; Revised January 10, 2018; Accepted January 11, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Neutron guides with neutron total-reflection properties on the inner surface of them are used for efficient transport of the neutrons lost by general reactors and spallation neutron sources to instruments far from the source. In order to understand the neutron transmission characteristics according to the shapes and the specifications of these neutron guides, we used the method of the neutron acceptance diagram. We used the CG1 guide system located in the "HANARO" cold neutron laboratory building as a guides for the evaluation; the system is composed of an in-pile guide, a curved guide and a straight guide. In order to understand the characteristics of the CG1 guide system, we determinded how the energies and the intensity distributions of the neutrons emitted from the neutron source changed when they passed through each guide. We also evaluated the gain of the guide by using the in-pile guide and the cause of the asymmetry of the neutron intensity by using the curved guide. Futhermore, we evaluated the effectiveness of a combination of the curved guide and the straight guide for reducing the asymmetry.
PACS numbers:
Keywords: Neutron guide, Guide gain, Neutron total reflection, Neutron acceptance diagram

July 2018, 68 (7)
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