canSAS-XI/TOFSANS

Chair : Andrew Jackson

Presentations

Session Plenary overview : TOF-SANS Blessing or Curse?

Judith Houston : LoKI Detectors

Sebastian Jaksch :

Anna Sokolova : Experiences from Bilby

Session Notes

Houston presentation

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• 4 layers of Cu tubes, each containing 7 10-B straws
• Simulated in McStas+GEANT4 > Mantid

• Issues:
  • Can’t survey in pixels
  • Parallax because of depth
  • Differential efficiencies/self-screening
  • Sheer number of pixels (10M)

Andrew Jackson: But can readout each individual straw!

Brian Pauw: Will probably need angle-dependent pixel efficiency maps? Could also use Bragg peaks at known positions on different detectors to back-calculate wavelength if d-spacing known?

Adrian Rennie: And what about relative efficiencies? There will be a huge amount of information in detector calibration file!

Jaksch presentation

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• Angular resolution
• Wavelength resolution

• Issues:
  • Measurement of distance
  • Measurement of openings
  • Measurement of angles
  • Measurement of relative time (cables lengths)
  • Measurement of absolute time (moderator emission time)
  • Measurement of Qmin
  • Measurement of intensities

• Standards
  • Reproducibility
  • Durability
  • Reliability

Summary

- Need to better understand flood calibrations, and run comparisons

- Investigate nanostructured porous materials as Q calibrants

- Need to use better descriptions of resolution

- Need better handling of multiple scattering

Actions

- Formation of a TOF-SANS working group : AJJ