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Characteristics

Guide hall n°1, cold guide H151
Monochromator
Velocity selector (ASTRIUM,) Δλ/λ ≈ 10 % (FWHM) (at zero rotation angle)
Incident wavelength Variable, 3.2 ≤ λ [Å] ≤ 25
Beam monitor (LND, Inc.) Thin235U monitor with 10-6relative efficiency (count rate ≈ 10 kHz at λ = 6 Å)
Polarization
m = 4 polarizing double-V cavity (SwissNeutronics) Cross section (height × width) : 30 × 30 mm2over 1.37 m
Flipping ratio at sample position > 100 at λ = 4-8 Å (max. 150 at λ = 6 Å) over a beam with 20 mm diameter
Collimation
Beam attenuators A set of 4 sintered10B4C + Gd sieves (with identical hole density but different hole diameters), effective attenuation factors ≈ 1970, 550, 120 and 30
3 xm = 1non-polarizing guides (SwissNeutronics) Cross section (height × width) : 30 × 30 mm2over 6.5 m
Collimator nose 2 ... 2.5 m (continuously adjustable to accomodate various sample environments)
Guide-to-sample distances 2.5, 5, 7 and 9 m (+/- 0.15 m)
Sample area
Sample aperture User-defined, typically up to Ø = 20 mm
Flux at specimen at reactor power = 54.8 MW & lowest resolution 6.1 x 107n.cm-2.s-1(at λ = 5 Å)
Brightness at specimen at reactor power = 54.8 MW & lowest resolution 4.2 x 1011n.cm-2.s-1.srad-1(at λ = 5 Å)
Typical sample size 5-15 mm Ø
Sample table x, y, z translations, 2 independent goniometers and rotations
Ancillary sample environments Thermally regulated sample changer (15 positions), 5 < T < 80 °C10 T horizontal cryomagnet (Oxford Instruments), 1.5 < T < 300 K1.5 T electromagnet (GMW Associates), T = 300 K
Detector
Detector type Single panel monoblock3He position-sensitive detector (ILL)
Area, pixel size 640 x 640 mm2, 2.5 x 5 (H x V) mm2
Background ≈ 1.8 Hz on whole detector (electronic noise, reactor off), ≈ 12.5 Hz reactor on
Sample-to-detector distance 0.75 ... 6.7 m (continuously adjustable)
Momentum transfer range 5·10-3≤ Q [Å-1] ≤ 0.6 (at λ = 6 Å)Down to 2·10-3Å-1at λ = 15 ÅUp to 1.05 Å-1at λ = 3.2 Å