Generate powerful, highly uniform magnetic fields within a compact footprint.
Internal Field Halbach Cylinders are often called Dipole Rings or ‘Magic Rings’.
It uses a continuously rotating magnetization vector to concentrate flux inside the bore.
This design also cancels out the magnetic field on the exterior.
This self-shielding topology allows researchers and device manufacturers to achieve 1.0 Tesla to 2.0+ Tesla fields.
Meanwhile without the massive iron yokes or high power consumption of electromagnets.
Our cylinders offer the critical balance of high field strength.
And spatial uniformity (homogeneity) required for precision physics
No matter you are developing benchtop NMR spectrometers.
Or particle beam focusing optics, and magnetic refrigeration systems.
Engineering & Manufacturing Capabilities
Precision Sector Assembly:
We manufacture cylinders using segmented wedges (8, 12, 16, 24, or 32 segments).
Higher segmentation approximates a perfect Halbach rotation.
Reduces harmonic distortion and improving field uniformity.
Harmonic Tuning & Shimming:
Achieving <100 ppm homogeneity requires more than just assembly.
We offer passive shimming services.
They place tiny corrective magnets or iron shims inside the bore after mapping.
Cancel out error harmonics and flatten the field profile.
Mechanical Containment:
We encase our cylinders in Non-Magnetic Stainless Steel, Titanium, or Carbon Fiber Composite sleeves.
This design manages the immense internal stress of a dipole array.
This ensures structural integrity even under thermal cycling.
Customization Options
Organize by the magnetic characteristics required.
A. Field Configuration (Multipole Orders)
We design the array based on the function of your beamline or sensor:
Dipole (k=1):
Creates a uniform straight field across the bore.
Primary use: NMR, ESR, Oscillator experiments.
Quadrupole (k=2):
Creates a linear field gradient (zero at center, strong at walls).
Primary use: Focusing particle beams, magnetic lenses.
Sextupole / Octupole:
For higher-order chromatic correction in accelerators.
B. Variable Flux Systems (Nested Cylinders)
Rotatable “Halbach-in-Halbach”:
We can engineer concentric cylinders.
Their inner ring rotates relative to the outer ring.
Function:
This allows you to adjust the field strength continuously (e.g., from 0T to 1.5T).
Or change the field vector angle without moving the sample.
C. Temperature Stability
Low Temperature Coefficient (LTC) Materials:
For NMR applications, field drift is unacceptable.
We use specialized SmCo grades (low drift) or temperature-compensated NdFeB stacks.
Thermal Management:
Integration of cooling jackets or air channels for arrays used near heat sources.
D. Access & Dimensions
Longitudinal vs. Transverse:
Most Halbachs are transverse (field cuts across the tube).
But, we can also configure axial variants.
Split-Ring Designs:
Cylinders that can hinge open (“Clamshell”) to wrap around an existing vacuum pipe or beamline.
Defining the Invisible Field
Designing a Halbach cylinder is a trade-off between Diameter, Length, and Homogeneity.
Do not finalize your mechanical housing until you have verified the magnetics.
Request a Vector Field Simulation:
Send us your required Center Field (Tesla), Uniformity Region (DSV) and Maximum Outer Diameter.
We will simulate the array performance and harmonic content for you.
