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Technical Information - Kowari
Kowari

Technical Information - Kowari

Specifications

Neutron beam
  • Maxwellian distribution with peak intensity at ~1.5 Å 
  • Wavelength range: 1.20-2.85 Å 
  • Take-off angle range: 55-165° 
  • Max beam size: 60x30 mm2
Monochromator 
  • Double focusing bent perfect crystal 
  • Si(400) cut with [110] vertically 
  • Monochromator is made from 9 packets each composed from 13 wafers. 
  • Wafer dimensions: 270x17x0.91 
  • Work area: 200x170 mm
  • Thickness: 11.6 mm 
  • Available reflections (004), (111), (311), (511)
Detector
 
  • DENEX 2D, 3He-filled, 
  • Total area 300x300 mm2 
  • Detector coverage: 15°x15° (@ LSD ~ 1000 mm) 
  • Angular range: 40°< 2θB < 120°
 
 
Sample table
  • Unique telescopic design 
  • Maximum sample weight ≤ 1 tonne 
  • ±250 mm travel for X and Y 
  • 600 mm travel for Z

  

Instrument performance
  • Flux at sample position 7x106 n cm2s-1 (depends on monochromator reflection and focusing). 
  • Instrument is optimized for d-spacings ~ 1.1-1.3 Å to ne at ~90°. 
  • These are the most important reflections in engineering  applications αFe(211), γFe(311), Al(311).
  • For this range resolution is Δd/d ~2 x 10-3
Practical examples for time evaluation:  
  • Fe(211), gauge volume 0.5x0.5x0.5: t = 10 min to get 50 μstrain accuracy
  • Fe(211), gauge volume 1x1x1: t = 1 min to get 50 μstrain accuracy. 

Instrument location: Neutron-guide hall, thermal guide TG3

Instrument reference

A. Brule and O. Kirstein, Physica B 385-386, 1040-1042 (2006).