Comparative study and sensitivity analysis on different coil design approach for 1.0 T HTS extremity MRI magnet

A 1.0 T magnet suitable for extremity magnetic resonance imaging has been considered and a comparative study for the magnet is carried out by taking two distinct coil design approaches (Multi-coil and Compensate solenoid) with the help of COMSOL Multi-Physics. The magnet consists of double pancake coils made up of a 4 mm wide and 0.12 mm thick second-generation high temperature superconducting tape, manufactured by SuNAM. It has an inner winding diameter of 200 mm and is operated at 65 K. A field homogeneity of less than 50 ppm over a diametric spherical volume of 100 mm has been selected for both design approaches. The outer winding diameter and length of the magnet are restricted to 500 mm and 300 mm respectively. The major parameters such as peak axial and radial field, 5G stray field, magnetic field homogeneity, length and outer diameter of the magnet and total consumption of length of HTS tape are compared for the best configuration of two design approaches. Also, a sensitivity analysis corresponding to the field homogeneity is performed by varying the turns of coils. (author)