Experimental Research On Simulation Platform For Poloidal Magnetic Energy Transfer During Plasma Disruptions In J-TEXT Tokamak

The huge poloidal magnetic energy released during plasma disruptions which always happen in tokamak operation may cause extraordinary damage to the vacuum vessel. The new disruption mitigation method based on poloidal magnetic energy transfer has been put forward by J-TEXT Laboratory. This method can reach the goal of reducing the total energy dissipated in the vacuum vessel during the disruption by coupling portion of the poloidal magnetic energy to the outside of the tokamak device. And then the disruption damage can be mitigated. Since it's risky and difficult to carry out poloidal magnetic energy transfer experiments on J-TEXT directly, an experimental platform should be set up to carry out pre- feasibility researches. An experimental platform which can imitate J-TEXT tokamak disruption and the poloidal magnetic energy transfer process is designed in this paper. The simulation experiment researches of the new method can be conducted on the experimental platform by carrying out poloidal magnetic energy transfer experiments.This paper has a deep study in the energy dissipation process of J- TEXT and the principle of the new method. Two equivalent circuit models of the experimental platform which can be respectively used to simulate the disruption and the poloidal magnetic energy transfer process are built based on the studies. Meanwhile, the equivalence of the energy flow between the experimental platform and J-TEXT is verified. The experimental platform is designed based on the equivalent circuit models. The simulation analysis goes on by the method of combining MAXWELL software and Simulink software together. And then the rationality of the parameters is confirmed. The experimental platform is constructed according to the design. The rationality of the design and the feasibility of the method of poloidal magnetic energy transfer is verified by taking preliminary poloidal magnetic energy transfer experiments. In order to investigate the mitigation effect of the new method, the relationship between energy transfer efficiency and the parameters of the energy transfer coils is studied in the article. The influence of the install position, the loop resistance and the turn number is investigated. The experiment results indicate that, when the energy transfer coils locate more close to the plasma coil with lower loop resistance, the higher the energy transfer efficiency is. The turn number has little influence on the efficiency. The energy transfer coils can export at most 35.72% of the poloidal magnetic energy stored in the experimental platform. However, the poloidal magnetic energy dissipated in the plasma coil during disruption can be reduced by about 42.93% at most.The experimental results verified the feasibility of the method of poloidal magnetic energy transfer from principle. The results can also provide reference for the future poloidal magnetic energy transfer experiments on J-TEXT device.