Custom design superconducting magnet systems

At Oxford Instruments, we are proud to have been part of the success of many very challenging custom-designed superconducting magnet projects around the world, using our world-leading position in magnet and cryogenic engineering, project management, manufacture and customer support. Our expert team of magnet engineers and manufacturing team are focused at delivering magnet systems which, meet each customer's needs and budget.

The superconducting magnets systems which we have provided to customers, range across applications including neutron scattering, x-ray diffraction, optical spectroscopy, μSR, UHV environments, solid state NMR, ESR/EPR, levitation, gyrotrons, SPM and AFM environments, and materials processing.

Please contact us to discuss your specific requirements.

Examples of custom magnets

Magnet system/application Country
Recondensing 6/2/2 T vector rotate magnet (6 T solenoid / 2 T split pair / 2 T split pair) with VTI, using a NEW design of recondensing dewar. The system is fully recondensing (true zero boil off) with spare cooling capacity in static conditions, and is also fitted with special HTS current lead sections so that the system remains recondensing even with with current in leads. Czech Republic
3/3 T (2 x 3 T split pair, field directions in z- and x-axis) vector rotate magnet system with x- and y-axis optical access, VTI sample loading in z-axis, based upon our well-known Spectromag® cryostat. Poland
Recondensing 17 T @ 4.2 K, 18 T @ 2.2 K magnet system with VTI, using a new design of recondensing dewar. in sock. The system is fully recondensing (true zero boil off) with spare cooling capacity in static conditions. Switzerland
5/1/1 T (3 x split pair, 5 T in z-axis) vector rotate magnet system with x- and y-axis optical access, VTI sample loading in z-axis, based upon our well-known Spectromag® cryostat. China

Special wide bore solenoid magnet system for high temperature superconductor (HTS) coil testing and development

  • Superconducting magnet with specially reinforced coil structure to withstand forces with HTS insert coils in place
  • 8.5 T at 4.2 K, 10 T at 2.2 K
  • Magnet cold bore 147 mm diameter
USA
High homogeneity split pair magnet system for muon spin resonance (μSR) spectroscopy
  • 8 T @ 4.2 K and 9.5 T @ 2.2 K
  • Independent shims and custom-written software to maintain homogeneity across wide field range
  • Recondensing system including recondensation of LPF exhaust
Switzerland
Kelvinox®HA dilution refrigerator/magnet system with two cancelled 9 T solenoids with minimum coupling between both magnets, for nuclear demagnetisation refrigeration. UK

 

3-3-3 vector rotate magnet

3/3/3 Tesla vector rotate magnet system with optical access

This custom-designed vector rotate magnet system differs from the usual vector rotate configuration by featuring three orthogonal split pair magnet coils, rather than the more conventional solenoid with one or two orthogonal split pair coil sets. This is in order to offer straight-through optical access in the horizontal (x and y) axes, with perpendicular sample access and loading in the vertical z axis into a 1.5 K ‑ 300 K variable temperature insert (VTI).

Despite its apparently ‘low’ field, the magnet design is not trivial, due to the large twisting forces set up between the coils in their different vector combinations. Careful three-dimensional stress analysis enabled a successful design in which the magnet can be run to any vector up to 3 Tesla magnitude within a complete 360º sphere.

To fit the magnets in a compact arrangement, the z-, y- and x-axis coil pairs are nested inside each other as shown below. Each pair of coils is fitted with its own persistent mode switch.

The cryostat is a low loss Oxford Instruments design for optical and beamline applications. To reduce the number of optical elements in the beam path, the radiation shield has no windows but is fitted with re-entrant bore tubes to reduce the radiative heat load. This cryostat design can also be supplied as a zero-boiloff helium recondensing system.

3 T µSR magnet

3 Tesla high homogeneity magnet system for muon resonance (μSR) spectroscopy

This magnet system was supplied in 2009 for muon spin resonance spectroscopy on a customer’s new and upgraded beamlines, and consists of a high homogeneity, low drift rate 3 T split pair magnet mounted within the tail set of a low loss cryostat.

The magnet incorporates independent shim coils to provide a high level of homogeneity correction. As it is important in this application to remove remanent field effects, ‘zero field’ coils are located within the magnet.

The cryostat is based on a standard Oxford Instruments NMR-type low loss cryostat, with modifications to suit the specific requirements of the customer's system specification, and provides liquid helium hold time of > 14 days. Ambient temperature access is provided along the two orthogonal directions in the horizontal plane. Vacuum sealing faces and mounting holes for sample cryostats and are provided on the bore tube end flanges for integration with the beamline and detectors.3 Tesla high homogeneity magnet

A key success of this magnet system was in achieving the extremely tight clearance and precise alignment requirements of the magnet coils (right) within the cryostat tails. By comparing magnetic field plots from either end of the bore, the angular deviation of the flux density vector relative to the bore axis was calculated as only < 0.03º, compared to a specification requirement of < 0.2º – an excellent achievement.

Muon spin resonance (μSR) spectroscopy

The broadest application of μSR spectroscopy is as a magnetic probe with which to examine structural and dynamic processes in bulk materials on an atomic scale, providing a powerful technique to gain a deeper understanding of magnetic materials, semiconductors and superconductors. Beams of positive muons are created with aligned spins, which precess around the local magnetic fields within the material that the beam is fired into it. The muons decay into positrons which are typically ejected in the same direction as the muon spin. By measuring the directions in which the positrons are emitted, the μSR spectroscopist can investigate how the internal magnetic fields of the sample materials have influenced the muon spins.

Recondensing 2.2 K magnet

High homogeneity split pair magnet system for muon spin resonance (μSR) spectroscopy

This magnet system provides a high homogeneity, specific field profile in a horizontal room temperature bore tube, at 8 T (4.2 K) and 9.5 T (2.2 K). Field alignment is precisely made between the magnetic and mechanical axes within the bore.

A particular challenge of this magnet system was to be able to maintain homogeneity from very low fields right up to 9.5 T. This was achieved using independent shims in conjuction with custom-written software to set the shim currents automatically from the magnetic field being set by the magnet power supply.

To achieve the upper field without resorting to Nb3Sn conductors, a lambda point refrigerator (LPF) system was used. Since the main liquid helium bath is maintained at 4.2 K and atmospheric pressure, a pulse tube (PTR) recondensing system could be fitted to give zero liquid helium consumption during static conditions. Further, this removes the need for users to enter the beamline area to refill liquid nitrogen since the PTR cools the radiation shields.

The recondensing system has sufficient power to recirculate the LPF exhaust back into the magnet system, and reliquefy it, providing full recondensation with the magnet persistent at 2.2 K.

Picture gallery

22 Tesla magnet

22 Tesla magnet

3/3 (2 x 3 T split pair, field directions in z- and x-axis) vector rotate magnet system

3/3 (2 x 3 T split pair, field directions in z- and x-axis) vector rotate magnet system

11-Tesla-Horizontal-Magnet

11-Tesla-Horizontal-Magnet

Custom magnet

Custom magnet

Demagnetisation magnet

Demagnetisation magnet

Dual mode horizontal field split pair magnet system for neutron scattering

Dual mode horizontal field split pair magnet system for neutron scattering

Actively Shielded high homogeneity 12.5 T magnet

Actively Shielded high homogeneity 12.5 T magnet

High homogeneity magnet System for muon resonance (μSR) spectroscopy

High homogeneity magnet System for muon resonance (μSR) spectroscopy

Levitation-magnet

Levitation-magnet

Magnet for magnetic seperation

Magnet for magnetic seperation

Neutron scattering magnet

Neutron scattering magnet

Recondensing magnet system(at 2.2 K) for muon spin resonance

Recondensing magnet system(at 2.2 K) for muon spin resonance

UHV custom magnet

UHV custom magnet

14 T UHV recondensing magnet system

14 T UHV recondensing magnet system

Related Products

Solenoid magnets - Integra

Solenoid magnets - Integra

Solenoid magnets are available with fields up to 22 Tesla.

2D vector rotate magnet

Vector  magnets

Wide range of vector magnets including 2 and 3 axis vector magnets.

Helium recondensing dewars - IntegraAC

Helium recondensing dewars - IntegraAC

Considerably reduce the helium consumption of your helium dewar.

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