The Establishment Of Stochastic Magnetic Perturbation For J-TEXT Tokamak

External stochastic magnetic perturbation is an important means to study the confinement and transport of tokamak plasma. It can disturb the plasma surface to enhance the edge transport of particles and energy. And it can trigger magnetic island. If the amplitude is high enough, it can be used to study locked mode physics and drive rotation of the plasma. There are many internal and external tokamaks have developed or developing the research, and have scored a series of important achievements. External magnetic perturbation is considering to be installed on ITER to control the RWM.J-TEXT tokamak is a medium built by Huazhong University of Science and Technology, which has begun discharge. Considering the characteristics of J-TEXT tokamak and the requirements of physical experiment, we need external stochastic magnetic perturbation with a dominant mode m/n=3/1, 2/1 to resonate with the intrinsic mode. Therefore, external stochastic magnetic perturbation coils, the power systems and the control system for it must be designed and built.In this thesis, the profile of stochastic magnetic perturbation and its model for TEXT-U tokamak were analyzed. In order to develop a stochastic magnetic perturbation with greater capacity to supply m/n=3/1, 2/1modes and other modes, two stochastic magnetic perturbation coils were added on J-TEXT tokamak which were distributed symmetrically to the original coils on TEXT-U tokamak. The power supply can drive up to 7.5kA in the coils which produces a poloidally and toroidally averaged radial field of 2*10-4BT. With the requirement of the coils, a power supply system based on capacitive energy storage, the control system as well as the protection system were developed. The power supply system used a chopper circuit. Capacitors were charged by a single-phase non-controlled rectifier, which can store energy maximum to 1.7MJ and hold out power maximum to 2MW. The control system and the protection system were made up of hardware and software. The module was the core of the hardware and the QNX RTOS(real time operating system) was the platform of the software.After all, we analyzed this kind of chopper circuit with the experimental results similar to simulation. The stochastic magnetic perturbation coil and power supply systems are stable and practicable, which can produce corresponding magnetic perturbation and support the physical experiments.