Introductory Lecture Eighth-Order Coil Systems for Generating High Uniformity Extremely Low-frequency EM Fields: Field Computation, Application-specific Constraints and Heating Estimation by Dr. Romāns Kušņins

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The lecture is concerned with designing various coil systems capable of producing a magnetic field exhibiting a high degree of uniformity. Recent advances in cell therapy and molecular biology have captivated minds of researchers around the globe thereby stimulating intense scientific efforts. Promising findings in this field might substantially improve the existing medications and treatment strategies, as well as bring about novel ones. One finding is that the secretion of extracellular vesicles (EV) may be stimulated by exposing them to extremely low-frequency electromagnetic fields (ELF-EMF) without any noticeable adverse effect on their biological properties. However, it is by no means the only application of ELF-EMF produced by seemingly trivial current coil arrangements. The underlying mechanisms and workings of such coil systems will be discussed, as well as various practical challenges that must be addressed to construct practical coil systems with desired characteristics. In some specific cases, it is tremendously difficult to simultaneously ensure high magnetic field intensity, sufficiently large high-field uniformity region size, and compactness. Namely, compactness is the essential aspect of biomedical applications requiring the placement of the system into a bioreactor used to cultivate Mesenchymal Stem Cells due to the relatively small interior space. The heat produced by such systems is another critical aspect to be considered at the design stage and will also be addressed in this lecture.

IEEE MTTW'24