Flux Gain for Next-Generation Neutron-Scattering Instruments Resulting From Improved Supermirror Performance

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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 ... continued below

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10 pages

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Rehm, C. July 11, 2001.

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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, they discuss how the performance of modern neutron scattering instruments depends on the efficiency of these supermirrors. They 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.

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10 pages

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  • Society of Photo-Optical Instrumentation Engineers (SPIES Conference), Conference location not supplied, Conference dates not supplied

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  • Report No.: P01-111262
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 788629
  • Archival Resource Key: ark:/67531/metadc716347

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  • July 11, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 30, 2016, 5:18 p.m.

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Rehm, C. Flux Gain for Next-Generation Neutron-Scattering Instruments Resulting From Improved Supermirror Performance, article, July 11, 2001; Tennessee. (digital.library.unt.edu/ark:/67531/metadc716347/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.