Design And Analysis Of Cryogenic Cooling Of CFETR Toroidal Superconducting Magnet

CFETR(China Fusion Engineering Test Reactor)is the next generation tokamak fusion device independently designed in China,which is used to verify the engineering feasibility of high-power fusion power generation,and is of great significance for the development of fusion from experimental reactor to commercial reactor.As one of the most critical systems in the whole CFETR,the magnet system generates magnetic field to constrain the plasma to achieve fusion reaction conditions.While the superconducting magnet is subjected to high temperature thermonuclear radiation it also needs to maintain the cryogenic environment of the inner conductor.It is beneficial to improve the stability of toroidal field superconducting magnet to carry out the engineering research and design of the cryogenic cooling system of toroidal field superconducting magnet.Through design,analysis and optimization,the conceptual design and engineering research of the cryogenic cooling system of toroidal field magnet carried in this paper.First,the layout of the winding pack of the CFETR toroidal field superconducting magnet is designed and studied,and the long-term steady-state operating conditions of the winding pack are analyzed to determine the layout of the internal conductor winding of the magnet.The number of turns of the winding pack is one of the important parameters to measure the strength of the magnetic field.The magnetic field restrains the plasma,and the collision between the high-speed plasmas is conducive to the occurrence of fusion reactions.Secondly,on the basis of the determined winding design,combined with the physical structure parameters of the inner conductor of the CFETR toroidal field superconducting magnet,the design of the magnet winding and the arrangement of cooling channels are completed.Analyze and determine the mass flow rate of supercritical helium in the central cooling hole inside the winding conductor and the cooling flow path in the coil box,and complete the calculation of the pressure drop along the flow rate.Finally,combined with the calculated critical helium flow rate,the pressure drop along the way and the physical parameters of the cooling channel,the design of the series conductor cooling holes in the inlet and outlet areas is completed.The import and export area is to distribute supercritical helium into the cooling flow channel to achieve cooling of the magnet system.Using the vertical field superconducting coil winding structural parameters,the cooling flow channels in the coil box are designed and arranged,and the interface of the pipe is connected to the interface of the import and export area to realize the supply of the cooling flow channels in the coil box.Fig[49],Table[7],Ref[81]...