Numerical study to obtain the improved field homogeneity of HTS bulk magnet with enlarged inner diameter for compact NMR

29th International Symposium on Superconductivity

Fukada, S.^1 ; Kim, S.B.^1 ; Nakagawa, T.^1 ; Nomura, R.^1 ; Ueda, H.^1

Graduate School of Natural Science and Technology, Okayama University, 3-1-1, Tsushimanaka, Kita-ku, Okayama

700-8530, Japan^1

关键词: Analytical studies;    Compensation method;    Field homogeneity;    HTS bulk magnets;    Inner diameters;    NMR relaxometry;    Size and shape;    Trapped magnetic field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/871/1/012088/pdf
DOI  :  10.1088/1742-6596/871/1/012088

来源: IOP

【 摘 要 】

The strength and homogeneity of the magnetic field required for NMR relaxometry device are 1.5 T and 150 ppm/cm3respectively. It is relatively easy to generate the trapped magnetic field over 1.5 T at 77.4 K using the stacked HTS bulks, and 150 ppm/cm3field homogeneity was obtained using the fabricated field compensation methods on HTS bulks magnet with 20 mm inner diameter. However, it is still hard to obtain 150 ppm/cm3field homogeneity without field compensation methods. In this paper, in order to improve the trapped magnetic field homogeneity, the HTS bulk magnet with enlarged inner diameter was proposed and studied as the functions of size and shape of HTS bulk. The analytical study based on FEM was carried out to optimize the shape of HTS bulk magnet with enlarged inner diameter.