| Disruption often causes damage to the fusion devices by means of heat load and runaway electrons. The disruption mitigation has already become one of the hottest research point for the serious damage to the device and not be avoided. A new method to mitigate the disruption damage by transferring the plasma electromagnetic energy out of the tokamak decice through electromagnetic coupling of multiwinding transfer is study in J-TEXT. The energy processing system is an essential part of the new mitigation method which will directly affect the energy transferring efficiency, so to influence the mitigation effect. So this dissertation focuses on the energy processing system for disposing the transferred plasma electromagnetic energy, including:According to the characters of the transferred electromagnetic energy and the demands for energy processing system, the energy processing system scheme is designed. The four parts of the energy processing system are as follows: the energy absorption and overvoltage protection module based on varistors to protect the energy transferring system, the energy store module based on pulse capacitor to store the energy transferred out of the tokamak, the resistor module as a stand-by processing unit when the pulse capacitor module failure to consume energy, and the inverter module for energy feedback.According to the energy processing system scheme, each module is researched. An overvoltage model of plasma disruption is introduced to analysis the principle of the overvoltage. So the overvoltage protection and energy absorption module is designed and developed. The effectiveness of the overvoltage module is validated with disruption experiments in the J-TEXT tokamak. It shows that the overvoltage can be limited to 330 V. The PSIM simulation software is used to study the influence of different capacitances on the amount of energy transfered and stored. The pulse capacitor module has been firstly deployed and tested in the J-TEXT tokamak. The experimental results indicate that the energy transferred can reach 27.9% of the total plasma electromagnetic energy and the plasma electromagnetic energy stored by the pulse capacitors is 14%. On the basis of the simulation study, the resistor module is designed and developed. The experimental results indicate that the transferred energy can reach 43.4% of the total plasma electromagnetic energy. The energy feedback technology based on inverters to recycle the plasma electromagnetic energy stored in the pulse capacitors is researched. The grid-connected three-phase inverter scheme is proposed. Simulation studies the not grid and grid inverter, so as to provide guidance for the experiment test.The energy processing system for J-TEXT is validated with disruption experiments and reached the demands of the energy transferring. The energy processing system provides a reliable guarantee for the new disruption mitigation method. The research will be good references for ITER and further tokamak researches. |
