A comparison of experiment and simulation for neutron guidance through glass polycapillary fibers
- X-Ray Optical Systems, Inc., Albany, New York 12222 (United States)
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899 (United States)
- Department of Physics, State University of New York, Albany, New York 12222 (United States)
The transmission efficiency and exit divergence of cold neutrons guided through straight and bent polycapillary fibers made of borosilicate glass have been measured. Experimental results have been compared with a ray-tracing simulation. Good agreement between the two has been obtained by considering in the simulation only reflectivity losses due to absorption. Therefore, we conclude that the influence of other loss mechanisms on reflectivity, such as surface roughness and waviness, are not significant compared with absorption loss for the borosilicate polycapillary fibers we have measured. Using the same simulation program, we have characterized the performance of a neutron focusing lens placed at the end of a [sup 58]Ni guide tube and optimized for a neutron spectrum from a cold source at a temperature of 65 K. An order of magnitude increase in neutron intensity within a submillimeter focal spot is predicted.
- DOE Contract Number:
- FG02-92ER81411
- OSTI ID:
- 5991813
- Journal Information:
- Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 64:11; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYONS
BEAMS
BOROSILICATE GLASS
COLD NEUTRONS
EFFICIENCY
ELEMENTARY PARTICLES
FERMIONS
FIBERS
GLASS
HADRONS
NEUTRAL-PARTICLE TRANSPORT
NEUTRON BEAMS
NEUTRON GUIDES
NEUTRON TRANSPORT
NEUTRONS
NUCLEON BEAMS
NUCLEONS
PARTICLE BEAMS
RADIATION TRANSPORT
SIMULATION