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A new SANS with high resolution and a wide dynamic range

A Small Angle Neutron Scattering (SANS) instrument with time-of-flight (TOF) and polarized neutron options with enhanced dynamics q-range. It is designed to allow high magnetic fields at the sample position.

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Characteristics

Planned characteristics

  • Cold neutron guide: H14(2)
  • Pin-hole geometry
  • Instrument length: about 20 m + 20 m
  • Accessible q-range: of the order 5 x 10-4 Å-1 to 1 Å-1
  • Multitube detectors
    • a front detector of the order ~1 m x ~1 m in area with a central "hole"
    • a back detector of the order ~1 m x ~1 m in area with full coverage
    • both in-line and within the same detector tank
  • Monochromatic mode
    • two velocity selectors: range 4.5 Å - 25 Å with nominal bandwidth of 10% (8-20% under rotation) and 5% (3-8 % under rotation)
  • TOF mode
    • double-chopper system (four independent choppers) with separations of 0.7 m, 1.4 m and 2.8 m. This will allow a Δλ/λ of approximately 10% for sample-detector distances.
    • massive dynamic q-range (qmin/qmax) of up to ~1000
  • Beam polarization and spin analysis
    • beam polarizer: specifications not yet final (supermirror-based)
    • analyzer: polarized 3He gas, large (~30 cm) silicon faced quartz cell at pressure ~0.5 bar in a "magic box" providing constant and homogeneous magnetic field
    • radio-frequency spin flipper
  • Ready for high magnetic fields