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
- 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
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
