Variable single-axis magnetic-field generator using permanent magnets

We present a design for producing precisely adjustable and alternating single-axis magnetic fields based on nested Halbach dipole pairs consisting of permanent magnets only. Our design allows for three dimensional optical and mechanical access to a region with strong adjustable dipolar fields, is co...

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Veröffentlicht in:AIP advances 2019-11, Vol.9 (11), p.115312-115312-8
Hauptverfasser: Tretiak, Oleg, Blümler, Peter, Bougas, Lykourgos
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creator Tretiak, Oleg
Blümler, Peter
Bougas, Lykourgos
description We present a design for producing precisely adjustable and alternating single-axis magnetic fields based on nested Halbach dipole pairs consisting of permanent magnets only. Our design allows for three dimensional optical and mechanical access to a region with strong adjustable dipolar fields, is compatible with systems operating under vacuum, and does not effectively dissipate heat under normal operational conditions. We present a theoretical analysis of the properties and capabilities of our design and construct a proof-of-concept prototype. Using our prototype, we demonstrate fields of up to several kilogauss with field homogeneities of better than 5%, which are harmonically modulated at frequencies of ∼1 Hz with a power consumption of approximately 1.2 W. Moreover, we discuss how our design can be modified to generate adjustable quadrupolar magnetic fields with gradients as large as 95 kG/m in a region of optical and mechanical access. Our design is scalable and can be constructed to be suitable not only for table-top experiments, as in the case of polarimetric and magnetometric setups that require strong alternating magnetic fields, but also for large scale applications such as generators.
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subjects Design modifications
Dipoles
Magnetic fields
Magnetism
Permanent magnets
Polarimetry
Power consumption
Prototypes
System effectiveness
title Variable single-axis magnetic-field generator using permanent magnets
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