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ChallengesforSANS
Ricardo Ferraz Leal
rhf@ornl.gov
SANS Beamline scientists requirements
• When Qx/Qy is rebinned, dQx/dQy
changes accordingly
• 2D plot I(Qx, Qy)
• Qx – binned
• Qy – binned
• dQx – binned
• dQy - binned
• I
• Sigma(I)
Workpace2D current implementation
• Qx – binned ✓︎
• Qy – binned ✕
• Spectrum number
• dQx – binned ✓︎
• dQy ✕ – binned ✕
• I
• Sigma(I)
• When Qx/Qy is rebinned,
dQx/dQy changes accordingly ✕
• 2D plot I(Qx, Qy) ✓︎
Very soon…
• dQxi and dQyi are now a single value representing the standard deviation of a
gaussian distribution (the instrument resolution).
• In the future this will be a convolution of multiple factors affecting the
instrument resolution, e.g., a convolution of multiple functions.
• Because this function is sometimes difficult/impossible to describe
analytically, it will be digitized as 2 arrays (𝑞 = 𝑓 𝑞 ) which can then
interpolated.
• All in one: For every Qx/Qy we need 2 extra arrays.
• SasView will read this format once adopted by canSAS / NXcanSAS.

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SANS Challenges

  • 2. SANS Beamline scientists requirements • When Qx/Qy is rebinned, dQx/dQy changes accordingly • 2D plot I(Qx, Qy) • Qx – binned • Qy – binned • dQx – binned • dQy - binned • I • Sigma(I)
  • 3. Workpace2D current implementation • Qx – binned ✓︎ • Qy – binned ✕ • Spectrum number • dQx – binned ✓︎ • dQy ✕ – binned ✕ • I • Sigma(I) • When Qx/Qy is rebinned, dQx/dQy changes accordingly ✕ • 2D plot I(Qx, Qy) ✓︎
  • 4. Very soon… • dQxi and dQyi are now a single value representing the standard deviation of a gaussian distribution (the instrument resolution). • In the future this will be a convolution of multiple factors affecting the instrument resolution, e.g., a convolution of multiple functions. • Because this function is sometimes difficult/impossible to describe analytically, it will be digitized as 2 arrays (𝑞 = 𝑓 𝑞 ) which can then interpolated. • All in one: For every Qx/Qy we need 2 extra arrays. • SasView will read this format once adopted by canSAS / NXcanSAS.