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
Institute of Applied Physics, University of
Tsukuba, Tsukuba, Ibaraki, Japan,
Wako, Saitama, Japan,
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
mm was achieved.
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