Magnetic Field Analysis And Design In The Magnetic System Of Galatea Magnetic Confinement Device

Galatea magnetic confinement device is the primary research unit of thecontrolled thermonuclear fusion plasma catcher. Compared with other magneticconfinement devices such as tokamaks, stellarators, it has the characteristics ofSimple structure, Small volume and good controllability, and it can automaticallysuppress the instability of the plasma exchange. In foreign countries it has beenwidely studied. Our country is planning to make a research on it. Electromagneticfield analysis, calculation and design of magnetic system are its core part, but thereare no papers about them, therefore the electromagnetic field numerical calculationand optimization design are studied in this paper. Magnetic field distributions ofeach component in the magnetic system, analytical solutions of electric power,spatial distribution of the magnetic field and the influence of physical parameters onspatial distribution of magnetic field are given in this paper. Part of physicalparameters in magnetic system are designed which is of great significance in usingand improving the existing galatea magnetic confinement device.Several commonly used electromagnetic field numerical methods such asnumerical integration method, finite difference method and finite element methodare studied in the paper, and the advantages and disadvantages of the methods aboveare analyzed. The principle and implementation process of genetic algorithm arestudied, and they are the basis of electromagnetic field analysis, calculation anddesigning physical parameters in the magnetic system.Specific structure and working principle of galatea magnetic confinementdevice are analyzed, and the magnetic system components are studied, then the keyparts of physical parameters design are given. The relationships between plasmacurrent, pressure, interchange instability and the spatial distribution of magneticfield are studied. The conditions that ideal magnetic field configuration shouldsatisfy are given in the paper, and take it as starting point to design the physicalparameters of magnetic trap coils. Take the spatial position parameters of magnetictraps as the known quantity, then calculate the magnetic field distribution andelectric power of magnetic traps with numerical integration methods, and study theinfluence of magnetic trap coil ampere-turns on the magnetic configuration withfinite element software. The objective function of genetic algorithm is establishedbased on the above two points, and ideal magnetic field configurations can be got byiterative optimization.The characteristics of magnetic field distribution in the whole plasma channelare given and the relationships between coil spacing and the uniform magnetic field area on the axis. The whole plasma channel is optimized with genetic algorithm. Theparameters such as coil spacing and current of the whole plasma channel aredesigned in the paper.The position of chute coils and the influence of current on barrier magneticfield are studied with finite element software. The reasonable parameters of chutecoils are designed in this paper to open a gap in barrier magnetic field.