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Optics

We provide neutron optical components for optimising neutron instruments. From monochromator and analyser crystals to converging guides, bandpass filters and polarising 3He spin-filters and supermirror devices, the ILL neutron optics lab provides the know-how and the in-house manufacturing capabilities. We develop and produce the neutron optical components required to maintain the leading role of the ILL in neutron scattering.

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TYREX filling station

TYREX : Polarised 3He filling station

The “Tyrex” filling station for nuclear polarisation of 3He gas has been constructed at the ILL during 2000-2002. The Tyrex machine uses metastability-exchange optical pumping for polarising the 3He gas at about 1 mbar pressure. The gas is then compressed up to several bars via a hydraulic titanium-alloy piston compressor. The machine can provide about 1.3 bar.l/h of 75-80% polarised gas.

Compressor head

Compressor

  • Powerful hydraulic actuator under closed-loop computer control
  • Velocity: 30 cm/sec, final position within 3 µm precision
  • Polarisation Preserving Piston and Chamber: Titanium alloy, 11 cm diameter and 55 cm stroke
  • Total displacement: 5200 cm3, compression ratio: >15000

Laser

  • Infrared Yb-fiber laser (All-fiber V-Grove Tech. from Keopsys SA)
  • Optimised for Helium gas 23S1-23P transition (1083 nm, 2 GHz bandwidth)
  • Power : 44W (five 10W or 4 W units)

Magnetic field

  • 9 coils of 2 m diameter
  • Field amplitude: 10 Gauss
  • Homogeneity region:  diameter 0.9 m, 2.5 m long
  • Relative field gradient : < 1.2 10-4 cm-1

Performances

  • 83% polarisation in static mode
  • 77-80% on neutron beam
  • Production rate :  1.3 bar-litre / hour
  • Final pressure : up to 4 bar

 

 

Production

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