Undulators are devices that create an extremely narrow beam of collimated, high-energy light by periodically deflecting charged particles traveling at the speed of light. This light is then used for research at the molecular level in medicine, industry, and science in general. In an undulator, deflection of charged particles is performed by periodically changing the magnetization direction of permanent NdFeB magnets. To achieve high collimation, the charged particles must be deflected by the correct angle when passing over the magnets. So, over the entire surface of a magnet, the magnetic field must be as homogeneous as possible. To ensure that we achieve the correct shape of desired magnetic field across all magnets inside the undulator, each magnet must be accurately measured after manufacture procedure so that we know what we are dealing with. Company Kyma Technologija d. o. o. is specialized in manufacture of undulators and specific measurement equipment for measuring and characterizing the magnetic field. Together with this company and a colleague from the Faculty of Mechanical Engineering in Ljubljana, we have developed a measuring device that automatically measures first integrals of magnetic field on the surface of a selected magnet at different angles. We can then use results of these measurements in a tomography algorithm that returns a 2D image of magnetic field density on the same surface. This image can then be used to analyze the homogeneity of the magnetic field.
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