From canSAS

Chair : Andrew Jackson


Session Plenary overview : TOF-SANS Blessing or Curse?

Judith Houston : LoKI Detectors

Sebastian Jaksch :

Anna Sokolova : Experiences from Bilby

Session Notes

Houston presentation

  • 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

  • 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


- 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


- Formation of a TOF-SANS working group : AJJ