| Tokamak and stellarator are two of the most deeply studied experimental devices for magnetic confinement fusion.In recent years,due to the successful operation of W7-X stellarator in Germany,there is an upsurge of stellarator research in the world.H-1 stellarator is a medium-sized Heliac.It is the only national plasma fusion research facility in Australia.At present,University of South China is implementing the project of Introducing the H-1 stellarator from Australian National University,which will be of great significance to the development of magnetic confinement fusion research in China.Compared with the two-dimensional equilibrium magnetic field distribution of Tokamak,the H-1 stellarator has more complex magnetic field coil system and three-dimensional magnetic field distribution.In order to carry out the experimental research based on the stellarator in China in the future,we take the lead in studying the magnetic field coil distribution and magnetic field configuration characteristics of the H-1stellarator,and simulate and calculate the motion orbit of energetic ions in the configuration of the stellarator,and study its motion orbit characteristics,so as to lay a foundation for the extensive theoretical and experimental research of the stellarator in the future.The main research works and conclusions are as follows:(1)Based on the structural parameters of H-1 stellarator,a simplified model of the spatial distribution of magnetic field coil in H-1 stellarator is established.The spatial distributions of 42 coils of 5 kinds of magnetic coils,such as toroidal field coils,poloidal field coil,inner vertical field coils,outer vertical field coils and helical control winding,are drawn.The calculation method of magnetic induction intensity for H-1 stellarator is described,and the HELIAC code of tracking magnetic line is introduced.(2)The Poincaré maps of magnetic field of H-1 stellarator in poloidal cross-sections with different toroidal angles for standard mode and full spiral mode are simulated and calculated by using HELIAC code.Based on the rotation law of magnetic axis position and magnetic surface,the Poincaré maps of magnetic field in poloidal cross-sections with different toroidal angles are rotated and translated to obtain an Poincarémaps of magnetic field in equivalent calibration poloidal cross-section in the rotating coordinate system.The rotating coordinate system is very helpful to analyze the magnetic field configuration and the orbit characteristics of the three-dimensional stellarator.(3)Base on the simulation calculation by using HELIAC code,the Poincaré maps of magnetic field,rotation transformation,magnetic well and magnetic island of H-1 stellarator in poloidal cross-sections of H-1stellarator are discussed.The configuration characteristics of vacuum magnetic field under various power supply modes are analyzed,and some characteristic configuration parameters of magnetic field are obtained.(4)Based on the calculation of the magnetic field configuration of H-1 stellarator,the three-dimensional orbit of energetic ions in the vacuum magnetic field configuration of H-1 stellarator is simulated and calculated.The motion position of energetic ions in three-dimensional space is projected to the equivalent calibration poloidal cross-section with different toroidal angles in the rotating coordinate system,so that the characteristics of the motion orbit the charged particles in the stellarator configuration can be easily analyzed theoretically and intuitively.The results show that the orbit characteristics of passing particles and captured particles in H-1 stellarator are similar to those of the corresponding particles in Tokamak.The difference is that the orbit of passing particles in H-1 stellarator is closed after several cycles of equivalent calibration polar section,and the banana orbit of the captured particles in H-1stellarator is not closed,and the orbit gradually drifts towards the outside of magnetic surface,eventually,it can cause particle loss. |
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