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Proceedings Paper

Flux gain for next-generation neutron-scattering instruments resulting from improved supermirror performance
Author(s): Christine Rehm; Michael M. Agamalian
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Paper Abstract

Next-generation spallation neutron source facilities will offer instruments with unprecedented capabilities through simultaneous enhancement of source power and usage of advanced optical components. The Spallation Neutron Source (SNS), already under construction at Oak Ridge National Laboratory and scheduled to be completed by 2006, will provide greater than an order of magnitude more effective source flux than current state-of-the-art facilities, including the most advanced research reactors. An additional order of magnitude gain is expected through the use of new optical devices and instrumentation concepts. Many instrument designs require supermirror (SM) neutron guides with very high critical angles for total reflection. In this contribution, we will discuss how the performance of modern neutron scattering instruments depends on the efficiency of these supermirrors. We outline ideas for enhancing the performance of the SM coatings, particularly for improving the reflectivity at the position of the critical wave vector transfer. A simulation program has been developed which allows different approaches for SM designs to be studied. Possible instrument performance gains are calculated for the example of the SNS reflectometer.

Paper Details

Date Published: 8 November 2001
PDF: 10 pages
Proc. SPIE 4509, Neutron Optics, (8 November 2001); doi: 10.1117/12.448076
Show Author Affiliations
Christine Rehm, Oak Ridge National Lab. (United States)
Michael M. Agamalian, 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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