Split pair magnets for neutron, muon and X-ray scattering and diffraction

Oxford Instruments is proud to have pioneered the design of magnet systems for neutron scattering. We can combine field orientation, field strength (up to 15 T), neutron access and low temperature to provide you with a uniquely powerful measurement platform.

To ensure optimum operation in neutron scattering applications, all our magnets have specific features such as:

  • Parallel and transverse field access
  • No liquid helium in the beamline. Direct access for neutron beam
  • Simple integration with the beamline infrastructure
  • Easy and quick sample change and cool down

Cryomagnet: Zero boil off cryostat in static mode for neutron scattering magnet

Do you want to reduce your dependence on liquid helium while optimising the use of your beamline? Then you may be interested in our helium recondensing options which offer:

  • Optimum magnet performance
  • Optimised sample throuput and use of beamline time
  • Faster magnet sweep rates and improved VTI performance (such as cool down time and cooling power) compared to cryogen free systems
  • Ability to keep the magnet cold for long periods whilst cooler is off allowing the magnet to be moved cold. Enhanced short term protection against power failure

Oxford Instruments has unrivalled expertise in the design of zero boil off cryomagnets for neutron scattering. We have now sold systems in most of the major neutron scattering facilities in the UK, France, USA, Australia, USA and most recently Japan and China.

Please see case study from ISIS to find out more about systems we delivered to them recently.

To find out more about how we design split pair magnets for neutron scattering applications, please download the free article from IOPScience.

Typical high field magnet systems

Field strength 15 T at 2.2 K
13.5 T at 4.2 K
Field direction Vertical
Homogeneity (over 10 mm DSV ) 0.5 %
Split at magnet centre line 20 mm
Split angle +/- 2 degree
Neutron access in the horizontal plane 330 degree
Sample temperature range 1.6 - 300 K

Zero boil off cryomagnets

The Rutherford Appleton Laboratory purchased two recondensing neutron scattering magnets including a 9 T wide angle and 14 T at 4.2 K. These magnets are used on the LET, MERLIN and WISH target stations at ISIS.

Dr. Oleg Kirichek, Sample Environment Group Leader at ISIS, Rutherford Appleton Laboratory commented: “Having a recondensing system allows us to considerably reduce our helium cost and health and safety issues. It also provides a homogeneous temperature distribution, which is crucial for optimum magnet performance. With these magnets, we should be able to provide our users with high magnetic field sample environments for neutron scattering experiments in a number of research areas such as high temperature superconductors, quantum magnets, spintronic materials, spin frustrated systems, heavy fermions, nanomagnetic materials and the recently discovered iron-based high-temperature superconductors.”

The ILL(Institut Laue-Langevin, Grenoble) received a 10 T asymmetric split pair coil magnet for their three-axis spectrometers. Dr Eddy Lelièvre-Berna, Advanced Neutron Environment Team Leader at ILL, commented: “With this new design, the superconducting coils are reliably maintained at low temperature within a liquid Helium bath while considerably reducing the boil-off. Compared with dry systems, the absence of room-temperature bore provides a much larger sample space. It also reduces the amount of material in the beam and avoids unwanted neutron absorption and neutrons scattered to the detectors. Together, we have really made a step forward. Among the many topics to be investigated with this magnet are multiferroic properties, quantum phase transitions and excitations in single-molecule magnets. Our satisfaction is such that we have decided to order another magnet for studying the magnetic substrates of our future hard disks.”

Image gallery

Neutron scattering magnet ISIS

Neutron scattering magnet ISIS

Wide-angle-neutron-scattering-magnet

Wide-angle-neutron-scattering-magnet

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