Using the MCLIB Library: Small-Angle Instrument with Focusing-Mirror Collimation

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Description

Focusing mirrors in 1 or 2 dimensions can be used to increase the intensity in a small-angle instrument while maintaining high resolution. Using the recently added toroidal mirror region type in MCLlB (Monte Carlo library for neutron instrument design), we compare five mirror shares: the ideal ellipsoid the tangent toroid, 8 tangent toroidal segments, 8 tangential cylindrical segments, and 20 tangential cylindrical segments. A small-angle scattering instrument on a spallation source was simulated to study resolution. Comparisons show that the ellipsoid provides superior resolution, but that the 8 tangential toroids are a good compromise. A resolution of 0.00056 {Angstrom}{sup -1}(rms), ... continued below

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7 p.

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Seeger, Philip A. December 31, 1997.

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Description

Focusing mirrors in 1 or 2 dimensions can be used to increase the intensity in a small-angle instrument while maintaining high resolution. Using the recently added toroidal mirror region type in MCLlB (Monte Carlo library for neutron instrument design), we compare five mirror shares: the ideal ellipsoid the tangent toroid, 8 tangent toroidal segments, 8 tangential cylindrical segments, and 20 tangential cylindrical segments. A small-angle scattering instrument on a spallation source was simulated to study resolution. Comparisons show that the ellipsoid provides superior resolution, but that the 8 tangential toroids are a good compromise. A resolution of 0.00056 {Angstrom}{sup -1}(rms), or (-)(+)11% at Q = 0.005 {Angstrom}{sup -1}, was achieved in the simulation using neutrons in the wavelength range 4-15 A. The count rate is high because the full area of the moderator is viewed.

Physical Description

7 p.

Notes

INIS; OSTI as DE98002671

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  • Materials research using cold neutrons at pulsed sources conference, Argonne, IL (United States), 25-26 Aug 1997

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  • Other: DE98002671
  • Report No.: LA-UR--97-4029
  • Report No.: CONF-9708115--
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/659638 | External Link
  • Office of Scientific & Technical Information Report Number: 659638
  • Archival Resource Key: ark:/67531/metadc706663

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  • December 31, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • May 20, 2016, 5:57 p.m.

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Seeger, Philip A. Using the MCLIB Library: Small-Angle Instrument with Focusing-Mirror Collimation, report, December 31, 1997; New Mexico. (digital.library.unt.edu/ark:/67531/metadc706663/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.