Process Design of Cryogenic Distribution System for CFETR CS Model Coil

The superconducting magnet of Central Solenoid（CS） model coil of China Fusion Engineering Test Reactor（CFETR） is made of Nb_3Sn/Nb Ti cable-in-conduit conductor（CICC）,and operated by forced-flow cooling with a large amount of supercritical helium.The cryogenic circulation pump is analyzed and considered to be effective in achieving the supercritical helium（SHe） circulation for the forced-flow cooled（FFC） CICC magnet.A distributed system will be constructed for cooling the CFETR CS model coil.This paper presents the design of FFC process for the CFETR CS model coil.The equipment configuration,quench protection in the magnet and the process control are presented.

CFETR CS模型线圈迫流冷却流程设计

中国聚变工程实验堆(China Fusion Engineering Test Reactor,CFETR)中央螺线管(Central Solenoid)模型线圈超导磁体采用Nb3Sn和NbTi低温超导材料的CICC(Cable in Conduit Conductor)绕制而成,并用大量的超临界氦(SHe)冷却。通过低温氦循环泵能够有效的达到CICC磁体的超临界氦迫流冷却循环。为冷却CFETR CS模型线圈,需进行低温分配系统的建造。本文介绍CFETR CS模型线圈迫流冷却的流程设计。

Numerical and experimental analysis of AC loss for CFETR CS model coil

The central solenoid(CS) is an important component of China Fusion Engineering Test Reactor, for producing, forming and stabilizing plasma in the superconducting tokamak. It is a complicated work to design and manufacture the large superconducting CS magnet, so it is meaningful to design a central solenoid model coil(CSMC) and analyze its electromagnetic properties in advance. In this paper, the structure, design parameters and magnetic field distribution of the CS model coil are discussed. The peak power of radial and axial turn conductors and time bucket loss are analyzed by using piecewise-linear method. The CSMC AC loss with different Nb3 Sn CICCs and AC loss of ITER CS coil are compared. The special electrometric method to measure AC loss of the CS model coil for future reference is presented.

CFETR CS超导模型线圈氦进出口焊接工艺研究

冷却CS模型线圈的超临界液氦通过线圈上的氦进出口流入铠甲内部。本文给出了氦进出口焊接工艺与关键参数,并对焊接试样进行室温与低温拉伸试验及室温弯曲实验,研究了焊缝在室温与4.2 K下的力学性能。实验结果表明,焊接试样的机械性能均能满足CFETR CS超导模型线圈铠甲设计要求。

CFETR中心螺线管模型线圈磁场及电磁载荷计算

中国聚变工程实验堆的中心螺线管模型线圈由Nb3Sn、NbTi混合超导磁体组成,在初始设计阶段,需要进行大量的探索计算以获得设计方案。文章基于微元叠加法原理,利用Matlab的向量化编程,提出了一种可修改性强、计算时间短的磁场计算方法,并将计算结果与有限元法进行对比,证实了本方法是可行的,并提高了设计效率,同时给出了线圈电磁载荷的分布情况。

流道形状对铜基螺线管线圈冷却效果的影响

采用Fluent和ANSYS Workbench软件对水冷铜基螺线管线圈进行了流体分析及热流耦合分析。得到了水冷铜基螺线管线圈内壁面温度随曲率角和曲面角的变化关系。分析了3种不同流道截面(圆形、椭圆形、三叶形)的螺旋管线圈在同样工况下的出口及交界面的最大温度、平均温度和最小温度,发现流道形状会严重影响螺线管线圈的换热,椭圆截面和三叶形截面的螺旋管线圈相比圆形截面的螺旋管线圈具有更好的冷却效果,如平均壁表面温度均降低了近70℃,管壁上的最高温度也控制在了100℃以内,最大温差也控制在了60℃以内。