Note: Parametric tuning of the Helmholtz coil and its optimal designs with thick winding pairs

Jianhang Yang,Yanzhao Wang,Jie Pan,Yuxing Wang

doi:10.1063/1.5042007

Jianhang Yang, Yanzhao Wang + Show 2 more

Open Access

https://doi.org/10.1063/1.5042007

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Abstract

Thick winding pairs are generally utilized in high-power Helmholtz coil systems, where the coil-heating and insulation are usually of concern for their field uniformity. Beyond the ideal thin model, we discuss the field uniformity of thick Helmholtz coils and their optimal designs based on the numerical and experimental analysis. Furthermore, the design tuning parameters, i.e., ampere-turn configurations, are introduced to the numerical models to investigate their influence on the magnets’ field uniformity. The results show that different ampere-turn realizations of one ideal Helmholtz coil could induce up to ∼30% uniformity variation within the central region. Regardless of whether it is the conventional Helmholtz coil or its optimal designs, the increase in layer number and axial insulation gaps tends to improve the field uniformity. However, the increase in turns per layer results in a great reduction in their field uniformity. By optimizing the ampere-turn arrangement, it is possible to further improve the performance of a Helmholtz-coil-based magnet.

Highlights

Uniform magnetic field is utilized for magnetic resonance prostate imaging,[1] magnetic navigation[2] and drug delivery[3] in laboratory studies and industry applications
The same situation occurred in the analytical method proposed by Petkovic and Radic for designing Helmholtz coil systems, in which the coils were modelled as thin current loops, for both polygonal and round ones.[7]
Whether the above rules can be extended to the correction coils is examined in one of its optimal design, i.e., Tetra coil system, where a pair of correction coils were introduced in the middle.[14]

Summary

Introduction

Uniform magnetic field is utilized for magnetic resonance prostate imaging,[1] magnetic navigation[2] and drug delivery[3] in laboratory studies and industry applications. To verify the numerical method, the magnetic flux density of this thick Helmholtz coil was calculated and compared with experimental results.

Results

Conclusion