Overview This Python program enables interactive exploration of the magnetic fields produced by rings of permanent magnets. It provides a Graphical User Interface (GUI) for investigating magnet geometries and field homogeneity. The physical background is described in the article: Analytic approach to creating homogeneous fields with finite-size magnets Ingo Rehberg and Peter Blümler Phys. Rev. Applied 23, 064029 – Published 11 June, 2025, https://doi.org/10.1103/9nnk-jytn preprint: arXiv:2502.18262 Version History v1.0.1 This version includes a configuration inspired by: Sumit Tewari, Thomas O'Reilly, Andrew WebbImproving the Field Homogeneity of Fixed- and Variable-Diameter Discrete Halbach Magnet Arrays for MRI via Optimization of the Angular Magnetization DistributionJournal of Magnetic Resonance, Volume 324, 2021, 106923https://doi.org/10.1016/j.jmr.2021.106923 v1.1.0 Adds functionality to export STL files for 3D printing custom magnet holders. v2.0.0 Adds magnets in the form of cuboids and spheres to the point- and line dipoles.

How to get started: Unzip the file Halbach_two_point_oh_2_0_0.zip. Take a look at the User Guide.pdf Launch the interactive program by running main.py. Using the program: To rotate the ring cluster, check one of the buttons labeled r_e, r_a, or r_r. Important: To stop the rotation, activate the stp checkbox. Preparing for 3D printing: Click the STL button and follow the provided instructions for exporting the model.