The Development Of The Large-caliber Uniform High Intensity Magnetic Compatibility Test Equipment For ITER

International Thermonuclear Experimental Reactor(ITER)is the largest tokamak experimental reactor under construction in the world.The surrounding area will be covered by high magnetic field during operation,which will affect the safety of various electronic and electrical equipment.At present,there is no large-scale strong magnetic field platform to test the electromagnetic compatibility(EMC)of the equipment in the world.Entrusted by ITER international organization,this paper develops a set of large-caliber uniform high intensity magnetic compatibility test equipment.The main contents of this paper are as follows:For the first time in the world,a large-caliber and high power steady-state uniform high intensity magnetic compatibility test equipment with a nominal magnetic field of 60mT and a uniform magnetic field range of 2.1×2.1×2.1m has been successfully developed.A three-coil configuration for uniform magnetic field generation is proposed and verified by experiments.All performance indexes can meet the requirements of ITER test,and solve the design problems related to the uniform magnetic field with large-scale and cube shape.The multi angle design is carried out from the multi-physical coupling field,which ensures the excellent performance,safety and reliability of the equipment,and builds the largest uniform high intensity magnetic compatibility test equipment in the world.In the process of equipment development,the optimization design of the structural parameters is completed.Different technical solutions are studied,such as two-coil configuration,three-coil configuration with equal and unequal side length,four-coil configuration and more coil groups.Through comparative analysis,the three-coil configuration with equal side length is determined as the final scheme,which achieves the maximum optimization of space,weight and power loss.At the same time,based on the analysis of the structure of two coils and three coils of equal length,the calculation formulas of magnetic field uniformity,magnetic field intensity and structural parameters are derived,which can simplify the design of similar products.In addition,a set of multi-parameters optimization calculation program and the calculation method of rounding coil turns are also developed,which can reduce the size,weight and power consumption of the system while maintaining high magnetic field uniformity.On the basis of the final scheme,various factors affecting the magnetic field performance of the equipment are studied.Firstly,the conductor cross section,coil spacing,helical structure and coil lead connection of the coil structure are analyzed,and the influence degree is studied to determine the reasonable structure size.Secondly,under the premise of more installation offset variables,a reasonable method is selected to determine the allowable offset of the coil installation,which has guiding significance for the actual installation.At the same time,the influence of the installation deviation of Hall probe on the measurement error is also studied,and the bidirectional influence of the magnetic field generated by the equipment and the external environment is analyzed.According to the analysis results,the experimental platform is built,and the correctness of the results is verified by the measurement of one-dimensional Hall probe array and three-dimensional Hall probe.Based on the analysis method of the multi-physical coupling field,the temperature rise of equipment brought by a high current is studied by the coupling method of electromagnetic,temperature and fluid,and the structural stress of the system is calculated by using the coupling method of electromagnetic and structure.According to the relevant analysis results,a scheme of water cooling and heat dissipation is studied to ensure the safety and stability of the equipment in the heating state.At the same time,a system fixing method is designed to strengthen the stability of the system structure and ensure the safe and reliable operation under working condition.The measurement and acquisition system of the uniform high intensity magnetic compatibility test equipment is described.Based on the principle of magnetic field hall detection element and temperature detection element,a multi-point synchronous Hall probe array system is established to collect the magnetic field data in the test area,which can fully and accurately characterize the magnetic field distribution in the test area.And the Hall probe is calibrated,analyzed and tested to ensure the accuracy of the test elements and measurement.