Electromagnetic, mechanical and thermal performance analysis of the CFETR magnet system

Abstract

The Chinese Fusion Engineering Test Reactor (CFETR) superconducting magnet system was designed by the National Integration Design Group for Magnetic Confinement Fusion Reactor. The CFETR magnet system consists mainly of a central solenoid (CS) coil with six modules, 16 toroidal field (TF) coils, 8 poloidal field (PF) coils, and a set of correction coils (CC). The electromagnetic stresses and stored magnetic energy are huge on the CFETR magnets since they experience both large current densities and high magnetic field. The electromagnetic, structural and thermal performance needs to be evaluated to ensure that the magnetic field, stress, and hot spot temperature of the magnet system are within the allowed criteria.The evaluation of the electromagnetic performance of the CFETR superconducting magnet system under normal operation and fault conditions was performed. The two-dimensional finite element method was adopted to analyse the stress/strain behaviour of the CFETR CS coils. In addition, the thermal-hydraulic behaviour on quench propagation performance of the CFETR CS and TF coils was analysed to evaluate the hot spot temperature of the cable and the helium pressure inside a jacket during a quench.

Thermal–hydraulic analysis of the coil test facility for CFETR

“…The NbTi coils are cooled with supercritical helium at inlet pressure of 0.55 MPa, mass flow rate of 8 g/s and 4.5 K temperature at the inlet. The hydraulic parameters of the Nb 3 Sn and NbTi CICCs for the superconducting magnet can be shown in references (Ren et al 2015a; ITER 2009). …”

“…PERFORMACNE test of the China Fusion Engineering Test Reactor (CFETR) central solenoid (CS) and toroidal field (TF) insert coils is of great importance to evaluate the CFETR magnet performance in relevant operation conditions (Ren et al 2015a). A superconducting magnet of the coil test facility for CFETR magnet is being designed.…”

The Analytical Formula for Calculating the Self-Inductance for the Circular Coil of the Rectangular Cross-Section With a Non-Uniform Current Density

“…These calculations are used in many electromagnetic applications (tubular linear motors, magnetically controllable devices and sensors, current reactors, cochlear implants, defibrillators, instrumented orthopedic implants, in magnetic resonance imaging (MRI) systems, superconducting coils, and tokamaks, etc.). Also, there are nonconventional circular coils with nonuniform density current which are used in many technical applications such as superconducting coils and the homopolar motors [17][18][19][20][21][22][23][24][25][26][27][28][29][30]. Coils with rectangular cross-section and the nonuniform current density, which changes inversely with the cylindrical coordinate r known as Bitter coils, can produce extremely high magnetic fields up to 45 T. In this paper, we give a new formula for calculating the self-inductance of the circular thick coil of the rectangular cross section with nonuniform current density.…”

Parameter Optimization of Thyristor Snubber Circuit in LSTF Quench Protection System

“…The state that the superconductor reverts to resistive state, is defined as quench, which can lead to conductor temperature overheating and potentially destruction with ohmic heating. Therefore, the QPS plays a significant role in the safety of superconducting magnets [2], [3]. In case of quench accident, the energy stored in the coils should be rapidly removed by QPS.…”