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Abstract #0708

Development of a high T c superconducting bulk magnet with a homogeneous magnetic field using a finite element method and a single-layer shim coil

Daiki Tamada 1,2 , Yosuke Yanagi 3 , Yoshitaka Itoh 3 , Takashi Nakamura 1,2 , and Katsumi Kose 1

1 Institute of Applied Physics, University of Tsukuba, Tsukuba, Ibaraki, Japan, 2 RIKEN, Wako, Saitama, Japan, 3 IMRA Material R&D., Ltd., Aichi, Japan

A magnet using a high critical temperature bulk superconductor is the new magnet for NMR/MRI. The bulk magnet gives a strong magnetic field without a liquid cryogen such as helium. However, there is a critical problem, which is the inhomogeneous magnetic field of the bulk magnet. To overcome this problem, the magnet structure was optimized using a finite element method. In addition to this, a single-layer shim coil was developed to compensate the residual inhomogeneity of the magnet. As the result, the 6.9 ppm (peak-to-peak) in lower case Greek phi 6.2 multiplication sign 9.2 mm was achieved.

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