Two magnet configurations of multi-coil design (i.e.5-coil and 6-coil) for 1T extremity Magnetic resonance Imaging (E-MRI) magnet were analysed and compared numerically by using COMSOL multi-physics. Each configuration consists of 20 double pancake coils, which were wound using second generation (2G) HTS tape (SCN04200) from SuNAM and were operated at 50A, 65 K. The magnet satisfies a target field homogeneity < 50 ppm over an 80 mm Diametric Spherical Volume (DSV) by fixing the inner winding diameter as 200 mm and its length and outer winding diameter are restricted to < 350 mm and < 500 mm respectively. The key parameters such as central flux density, maximum total field, maximum radial field, stray field distribution and field homogeneity were analysed for both configurations. Comparison was carried out based on homogeneity for minimum length of HTS tape at 65 K. Configuration -1 results homogeneity of 32 ppm for a 5.35 km long tape.
Chand et al. (Sun,) studied this question.