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Proceedings Paper

Depth-graded multilayers as neutron Doppler converters at pulsed neutron source
Author(s): Alexandru Dan Stoica; Morris Lowell Crow; Jack Lee Robertson
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Paper Abstract

A moving diffractor changes the energy of elastically diffracted neutrons by the Doppler effect. Depth-graded multilayers can diffract neutrons over a large band of energy. Using a pulsed neutron source, such a depth-graded multilayer, decelerating synchronously with the incident neutron pulse, can shift the reflected neutrons into a compressed energy window. This focusing in energy is associated with a broadening of the pulse in time, but the process does not involve a significant decrease in the neutron phase-space density. The proposed method can be used to design long pulse or quasi-continuous sources of cold, very cold or ultra cold neutrons (UCN). The analysis concentrates on enhanced production of UCN at pulsed neutron sources.

Paper Details

Date Published: 8 November 2001
PDF: 6 pages
Proc. SPIE 4509, Neutron Optics, (8 November 2001); doi: 10.1117/12.448061
Show Author Affiliations
Alexandru Dan Stoica, Oak Ridge National Lab. (United States)
Morris Lowell Crow, Oak Ridge National Lab. (United States)
Jack Lee Robertson, Oak Ridge National Lab. (United States)

Published in SPIE Proceedings Vol. 4509:
Neutron Optics
James L. Wood; Ian S. Anderson, Editor(s)

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