Halbach Cylinders

Dipole and quadrupole cylinders for uniform bore fields.

Target Buyer:Research scientists and medical device engineers needing permanent uniform fields.

Dipole Halbach cylinder magnet assembly with segmented NdFeB ring

Best-Fit Procurement Use

Best fit for instrument teams that need a stable field inside a bore and must balance field strength, homogeneity, bore size, weight, and assembly risk.

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Capability Highlights

Highly uniform transverse or axial fields
No external power required
Compact footprint

Typical Applications

NMR/MRI
Particle accelerators
Sensor calibration

Engineering Focus

Field homogeneity (ppm)
Bore diameter constraints
Stray field containment
Segment sorting and angular orientation control

Buyer Decision Criteria

Inner bore diameter, useful field volume, and required homogeneity.
Dipole, quadrupole, sextupole, or higher-order field requirement.
Segment count, angular tolerance, and mechanical support strategy.
Temperature drift control and magnet grade selection for long measurement cycles.

Factory Capability

8, 12, 16, and 24+ segment cylinder assembly with controlled angular orientation.
Machined non-magnetic fixtures for safe bonding of strongly repulsive segments.
NdFeB or SmCo grade selection by temperature, radiation, and stability needs.
Bore-side field mapping and segment sorting before final assembly.

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Field Homogeneity	< 500 ppm	Critical for NMR resolution and beam focusing accuracy.
Segment Count	8, 12, 16, 24, or higher by homogeneity target	More segments can improve field approximation but increase assembly and sorting complexity.
Useful Bore Volume	Defined by instrument geometry and accepted field variation	Homogeneity only matters inside the sample, imaging, or beam aperture volume.

RFQ Checklist

Inner bore diameter and length
Required field strength (T)
Homogeneity requirements (ppm over volume)
Dipole vs. Quadrupole
Useful field volume, temperature stability target, and mapping method

Risk Controls

Angular deviation of segments: CNC machined non-magnetic fixtures for precise angle bonding.
Thermal drift during long measurement cycles: Select stable grades, define operating temperature, and include temperature notes with mapping data.
Bore field data that cannot be compared across suppliers: Define the measurement volume, probe path, and acceptance metric before quoting.

Validation Deliverables

Bore field map with homogeneity zone definition.
Segment angle and ID/OD dimensional inspection.
Material grade, coating, and magnetization direction documentation.
Packaging and handling notes for high-field assemblies.

RFQ to Delivery Flow

Share bore size, field strength, homogeneity volume, segment count preference, and temperature range.
We compare field target, manufacturable segment geometry, and fixture strategy.
Prototype approval uses bore mapping rather than surface-field claims alone.
Production lots follow matched segment sorting and the approved mapping method.

Product Gallery

Magnetic field inside a Halbach cylinder

Halbach cylinder isometric engineering illustration

Halbach cylinder top-view multipole layout

Buyer FAQ

How many segments do you use per cylinder?

Depending on homogeneity needs, we typically use 8, 12, 16, or 24-segment discrete rings.

Can you map the field inside the bore?

Yes. Bore-side mapping can be scoped with the useful volume and homogeneity metric required by the instrument team.

When should SmCo be considered for cylinders?

SmCo is worth reviewing when temperature stability, radiation exposure, or long-term field drift matters more than maximum remanence.

Related Resources

Engineering RFQ Inbox

[email protected]

Email RFQ Desk

Include target torque/speed, quantity, and delivery location.

Direct Engineer Chat

+8618857971991

Chat on WhatsApp

Use for drawing, specification, and RFQ clarification.

Factory Capability

8, 12, 16, and 24+ segment cylinder assembly with controlled angular orientation.

Machined non-magnetic fixtures for safe bonding of strongly repulsive segments.

NdFeB or SmCo grade selection by temperature, radiation, and stability needs.

Bore-side field mapping and segment sorting before final assembly.

Key Evaluation Matrix

Metric	Typical Range	Why It Matters
Field Homogeneity	< 500 ppm	Critical for NMR resolution and beam focusing accuracy.
Segment Count	8, 12, 16, 24, or higher by homogeneity target	More segments can improve field approximation but increase assembly and sorting complexity.
Useful Bore Volume	Defined by instrument geometry and accepted field variation	Homogeneity only matters inside the sample, imaging, or beam aperture volume.

Risk Controls

Angular deviation of segments: CNC machined non-magnetic fixtures for precise angle bonding.

Thermal drift during long measurement cycles: Select stable grades, define operating temperature, and include temperature notes with mapping data.

Bore field data that cannot be compared across suppliers: Define the measurement volume, probe path, and acceptance metric before quoting.

RFQ to Delivery Flow

Share bore size, field strength, homogeneity volume, segment count preference, and temperature range.

We compare field target, manufacturable segment geometry, and fixture strategy.

Prototype approval uses bore mapping rather than surface-field claims alone.

Production lots follow matched segment sorting and the approved mapping method.