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Abstract

This paper presents a brief review of the development trend of superconducting magnets in large scale applications towards high magnetic fields, depending on and pushing the Nb ₃Sn wire technics' continuous improvement. The focus is on analysis of the technology challenges of 14 T whole-body superconducting magnets. Using the Bonze Nb ₃Sn wires and on the base of a combination design of Nb ₃Sn and NbTi coils, an electromagnetic conception design of a 14 T whole-body MRI magnet is presented, and the thermal stability and quench protection are analyzed by simulations. The critical issues on stress, joints as well as shimming of 14 T whole-body superconducting magnets are also discussed. According to the results, this paper believes: 1) Nb ₃Sn wires are of the first important issue for 14 T whole-body superconducting magnets—the Bonze Nb ₃Sn wire is of the best choice but the performance specifications of the current products need to be improved further to match the requirements; 2) quench protection of 14 T whole-body superconducting magnets is one of the most complicated technics that covers design of the copper to superconductor (Cu/SC) ratio, coordination of the operating current and coil inductances, subdivisions of passive protection circuits and quench triggering control of active protection, as well as the stray field limitation during the transient process.

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Authors and contacts

Corresponding author:Li Ye,liye1@siat.ac.cn

Funds:Project supported by the Strategic Priority Research Program of Chinese Academy of Sciences, China (Grant No. XDB25000000)

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Cited By

DownLoad: Full-Size Img PowerPoint

	Nb₃Sn线圈1	Nb₃Sn线圈2	NbTi 线圈3	NbTi 线圈4	NbTi补偿线圈	NbTi屏蔽线圈
电流密度/A·mm^–2	80	95	25	35	65	65
铜超比	2	2	10	10	8	8

DownLoad: CSV

	无屏蔽	主动屏蔽
线圈最大长度/m	2.99	2.98
线圈最大外径/m	1.63	3.18
Nb₃Sn导线总量/m³(不含铜)	0.460	0.466
NbTi导线总量/m³(不含铜)	0.189	0.308
磁场不均匀度(ppm on 40 cm DSV)	1.1	2.4

DownLoad: CSV

	无屏蔽	主动屏蔽
中心磁场/T	14	14
Nb₃Sn线圈1最大磁密/T	14.76	14.66
Nb₃Sn线圈2最大磁密/T	10.67	10.02
NbTi线圈3最大磁密/T	8.28	7.40
NbTi线圈4最大磁密/T	7.54	6.28
NbTi补偿线圈最大磁密/T	6.78	6.01
NbTi屏蔽线圈最大磁密/T	—	4.36
5 Gs线(径向m × 轴向m)	21.2 × 26.6	11.8 × 14.8
线圈总能量/MJ	260	280

DownLoad: CSV

	无屏蔽	主动屏蔽
最大周向应力/MPa	645	651
补偿线圈轴向力/t, 压强/MPa	–2540, –78.6	–1560, –43.3
屏蔽线圈轴向力/t, 压强/MPa	—	1310, 20.3

DownLoad: CSV

	无屏蔽	主动屏蔽
运行电流/A	244	248.8
总电感/H	8746	10287
Nb₃Sn导线总长/km	315.6	320.4
NbTi导线总长/km	331.8	591.7

DownLoad: CSV

	无屏蔽	主动屏蔽
Nb₃Sn线圈1最小失超能量/mJ	34	42
Nb₃Sn线圈2最小失超能量/mJ	68	78
NbTi线圈3最小失超能量/mJ	32	68
NbTi线圈4最小失超能量/mJ	36	104
NbTi补偿线圈最小失超能量/mJ	14	18
NbTi屏蔽线圈最小失超能量/mJ	—	32

DownLoad: CSV

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Vol. 70, Issue 1 - 2021-01-05

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