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Technical Information - Quokka
Quokka

Technical Information - Quokka

Specifications, User Manual, Instrument reference.

Specifications

 

Velocity selector
  • Wavelength range < 4.5 to > 40 Å
  • Resolution nominally 7-18 % (conventional); 4 - 14 % (high resolution)
  • Transmission ~ 94%
Collimation 
  • Ni58 equivalent guides (50 mm x 50 mm) (4m, 7 x 2m)
Accessible Q range
  • 6 x 10-4 Å-1 - 0.7 Å-1 (with focussing lens optics for low Q, Qmin=4 x 10-3
    Å-1 without focussing optics)
  • Source aperture to sample aperture distance: 1 - 20 m (1, 2, 4, 6, 8, 10, 12, 14, 16, 20 m
  • Incident beam polarisation (Fe:Si sm, rf spin flipper) 
Sample area
  • Typical beam size - 10 mm (diameter) - up to 30 mm (diameter)
  • Sample support system AZ Systemes (x, y, z,θ, 2-circle goniometer) maximum weight 1000 kg 
  • Maximum vertical distance from support system to beam height - 500 mm
Detector
  • Sample - detector distance: 1.3 - 20.1 m (continuously variable)
  • Horizontal offset 450 mm
  • Active area: 1 m x 1 m
  • Spatial resolution 5 mm x 5 mm

Instrument location: Neutron-guide hall, cold guide CG1

User Manual

Operating Quokka

Instrument reference for publications

Wood, K et al, J. Appl. Crystallogr. 51(2), 294-314 (2018).