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Technical information Echidna

Technical information - Echidna

Instrument                     Specifications
Monochromator
  • Wavelength range 1-3 10-10 m
  • Variable monochromator take-off angle between 90o and 140o
  • Ge 335 monochromator with vertical [1 -1 0] allowing for hhl reflections
  • - 23 crystals of 12 mm high x 50-70 mm wide x 8mm thick
  • - variable vertical focusing between flat and curvature radius of 1 m
  • - typically used reflections 331, 335, 337
Primary Collimator
  • Selection of three options: 5', 10', open (~12-36' depending on the wavelength).
Secondary Collimator
  • 10' or natural divergence (~20-40' depending on the selected reflection).
Sample area
  • Max. beam size is 20 mm wide by 50 mm high
  • Sample rotation of 360o
  • X-y stage with 20 mm travel in each direction.
  • Sample cross tilt stage of +/- 20°
Detector
  • 128 linear position sensitive detectors of 25 mm diameter x 300 mm high
  • 128 collimators with 5' collimation and 15mm wide and 300mm high
Typical Scan Time
  • 1-6 hours (2.5 hours long-term average) depending on sample composition and size and selected instrument configuration

Instrument location: Neutron Guide Hall, thermal guide TG-1

Instrument reference

Avdeev, M., & Hester, J. R. (2018). ECHIDNA: a decade of high‐resolution neutron powder diffraction at OPAL. Journal of Applied Crystallography, 51(6), 1597-1604.