Magnetic Pole Pieces: Coercivity <10 A/m

Q: What is the primary function of magnetic pole pieces in bending magnets?

Magnetic pole pieces shape and concentrate magnetic fields to create uniform flux density across the magnet gap, enabling precise deflection of charged particle beams with minimal aberrations.

Q: Why are high-permeability materials essential for pole pieces?

High-permeability materials minimize magnetic reluctance, allowing efficient field concentration with lower magnetomotive force, reducing power consumption and heat generation while improving field homogeneity.

Q: How do pole piece geometry affect beam quality?

Precisely contoured pole surfaces (hyperbolic, cylindrical) create optimized field distributions that minimize sextupole and higher-order multipole components, reducing beam emittance growth and trajectory errors.

Component Specifications

Definition

Magnetic pole pieces are critical components in bending magnets used in particle accelerators, synchrotrons, and beamlines. These precisely machined ferromagnetic elements define the magnetic field geometry, ensuring uniform field distribution and precise beam deflection. They work in conjunction with electromagnet coils to create controlled magnetic fields that steer charged particles along predetermined paths. The pole pieces' geometry (typically hyperbolic or cylindrical surfaces) determines the field quality, while their material properties affect saturation characteristics and hysteresis losses.

Working Principle

Magnetic pole pieces operate on electromagnetic principles. When current flows through surrounding coils, it generates a magnetic field that is concentrated and shaped by the high-permeability pole pieces. The pole faces create uniform magnetic flux density across the gap, with the field strength proportional to the magnetomotive force and inversely proportional to the gap distance. The precise contouring of pole surfaces ensures field homogeneity, minimizing beam aberrations and enabling accurate particle trajectory control.

Materials

High-permeability electrical steel (M19, M36 grades), Vanadium Permendur (49% Co, 49% Fe, 2% V), Silicon steel laminations (0.35-0.65mm thickness), Pure iron (Armco grade), Nickel-iron alloys (Mu-metal for shielding applications)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Coercivity	<10 A/m
Surface Flatness	<10 μm over 100mm
Surface Roughness	Ra < 0.8 μm
Residual Induction	<0.1 Tesla
Dimensional Tolerance	±0.05 mm
Magnetic Permeability	>5000 μr
Operating Temperature	-196°C to +150°C
Saturation Flux Density	1.8-2.3 Tesla

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 19833, ISO 19834, DIN 17405, IEC 60404-8-6

Parent Products

This component is used in the following industrial products

Bending Magnet

A magnetic component that deflects and controls the path of charged particle beams in a linear accelerator.

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Engineering Analysis

Risks & Mitigation

Magnetic saturation at high fields
Mechanical deformation under magnetic forces
Corrosion in vacuum environments
Thermal expansion mismatches
Residual magnetism affecting field quality

FMEA Triads

Trigger: Material impurities or improper heat treatment
Failure: Reduced permeability leading to field inhomogeneity
Mitigation: Implement material certification (MTR), perform permeability testing, use vacuum annealing processes

Trigger: Inadequate surface finish or geometric errors
Failure: Field distortions causing beam instabilities
Mitigation: Apply precision grinding/polishing, implement CMM verification, use optical profilometry for surface analysis

Trigger: Improper assembly or alignment
Failure: Asymmetric field distribution and beam steering errors
Mitigation: Use laser alignment systems, implement shimming procedures, perform magnetic field mapping after assembly

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Geometric tolerances per ISO 2768-mK, magnetic properties within ±2% of specification, surface finish Ra < 0.8 μm

Test Method

Hall probe mapping for field homogeneity, permeameter testing for B-H curves, CMM for dimensional verification, eddy current testing for material defects

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

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Supplier transparency

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Manufacturers of Magnetic Pole Pieces

Manufacturer profiles associated with Magnetic Pole Pieces.

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Frequently Asked Questions

What is the primary function of magnetic pole pieces in bending magnets?