Daiki Tamada1, Keisuke Maruyama1, Katsumi Kose1, Takashi Nakamura2
1Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, Japan; 2RIKEN, Wako, Saitama, Japan
A cylindrical single-channel shim coil was developed for a high critical temperature (Tc) superconducting bulk magnet (4.7 Tesla) with a 23 mm diameter room temperature bore. The single channel shim coil was designed using circular current loops periodically placed on the cylindrical surface. The magnetic field distribution in a rectangular region (5 mm x 5 mm x 7 mm) was measured for various shim current values. As a result, about 30% homogeneity improvement was achieved for an optimal current value, which demonstrated usefulness of our approach.