canSAS-XI/TOFSANS: Difference between revisions

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=== Session Notes ===
=== 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 ===
=== Actions ===


- Formation of a TOF-SANS working group : AJJ
- Formation of a TOF-SANS working group : AJJ

Latest revision as of 20:46, 9 July 2019

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