中国聚变工程实验堆纵场超导磁体高性能Nb<sub>3</sub>Sn CICC导体稳定性分析

doi:10.19595/j.cnki.1000-6753.tces.191369

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Abstract In order to obtain the high-parameter confined plasma in China fusion engineering testing reactor (CFETR), the hybrid magnets of CFETR toroidal field (TF) magnetic system is to use three kinds of superconductors with different properties. The peak magnetic field can reach 14.43T and the maximum stress exceeds 700MPa. In this paper, the temperature margin and energy margin of the high-performance Nb₃Sn pancake coils of hybrid magnets are analyzed under different perturbation lengths and durations based on steady-state and transient thermal load conditions of CFETR TF magnets. The results show that the high-performance Nb₃Sn CICC conductors have a temperature margin of 2.0K and above under the peak field and -0.7% - -0.5% effective strain. However, the energy margin for electromagnetic disturbance (L_p=10m, t_p=100ms) under extreme conditions (B=14.43T, ε =-0.7%) is only 11.41mJ/cc. The decline of energy margin under severe local conditions is a serious problem. The quench caused by typical mechanical perturbation (L_p=0.1m, t_p=1ms) can raise the hot spot temperature of the conductor to above 100K within 5 seconds, which puts forward a high demand on the magnet quench protection system.

Key words： China fusion engineering testing reactor toroidal field superconducting magnets high-performance Nb₃Sn stability margin

Received: 22 October 2019

PACS:

TM249.7

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	Zhang Zhengshuo
	Zheng Jinxing
	Song Yuntao
	Liu Xufeng
	Lu Kun

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Zhang Zhengshuo,Zheng Jinxing,Song Yuntao等. Stability Analysis of High-Performance Nb₃Sn CICC Conductor in China Fusion Engineering Testing Reactor Toroidal Field Superconducting Magnets[J]. Transactions of China Electrotechnical Society, 2020, 35(24): 5031-5040.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.191369 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I24/5031

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