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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摘要针对中国聚变工程实验堆（CFETR）高参数等离子体约束要求,其纵场（TF）混合磁体的设计方案为采用三种不同性能的超导导体绕制,峰值磁场可达14.43T,最大应力超过700MPa。该文结合CFETR纵场磁体面临的稳态以及瞬态热负荷条件,系统分析混合磁体中高性能Nb₃Sn四饼线圈在不同扰动长度及扰动时间工况下的稳定性温度裕度和能量裕度,并对背景场强度及有效应变等因素对稳定性裕度的影响进行讨论。结果表明,高性能Nb₃Sn CICC导体在峰值磁场及-0.7%~-0.5%有效应变预计区间内拥有2.0K以上的温度裕度;但极端条件（B=14.43T, ε =-0.7%）下的电磁扰动（L_p=10m, t_p=100ms）对应导体能量裕度仅有11.41mJ/cc,局部恶劣工况下导体能量裕度下降严重的问题亟待解决。针对高场区单饼线圈在典型扰动下行为的计算表明,典型机械扰动（L_p=0.1m, t_p=1ms）引起的失超能够在5s内使导体热点温度升高至接近120K,这对磁体失超保护系统提出了较高的要求。

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关键词 ：中国聚变工程试验堆, 纵场超导磁体, 高性能Nb₃Sn, 稳定性裕度

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

收稿日期: 2019-10-22

PACS:

TM249.7

基金资助:安徽省杰出青年基金（2008085J28）、国家自然科学基金杰出青年基金（51525703）、国家重点研发专项（2017YFE030050，2017YFE0123400）和中国科学院青年创新促进会优秀会员（Y201979）资助项目。

通讯作者: 郑金星男,1987年生,副研究员,研究方向为聚变堆高场超导磁体设计。E-mail: jxzheng@ipp.ac.cn

作者简介: 张正硕男,1998年生,硕士,研究方向为超导磁体稳定性分析。E-mail: zhengshuo.zhang@ipp.ac.cn

引用本文:

张正硕, 郑金星, 宋云涛, 刘旭峰, 陆坤. 中国聚变工程实验堆纵场超导磁体高性能Nb₃Sn CICC导体稳定性分析[J]. 电工技术学报, 2020, 35(24): 5031-5040. Zhang Zhengshuo, Zheng Jinxing, Song Yuntao, Liu Xufeng, Lu Kun. Stability Analysis of High-Performance Nb₃Sn CICC Conductor in China Fusion Engineering Testing Reactor Toroidal Field Superconducting Magnets. Transactions of China Electrotechnical Society, 2020, 35(24): 5031-5040.

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