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The Establishment of Stochastic Magnetic Perturbation for J-TEXT Tokamak

Author: ShiWenFeng
Tutor: ZhuangGe
School: Huazhong University of Science and Technology
Course: Pulsed Power and Plasma
Keywords: J-TEXT Random magnetic field Capacitor discharge Chopper
CLC: TL631.24
Type: Master's thesis
Year: 2011
Downloads: 15
Quote: 0
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Abstract


Plus a random disturbance magnetic field is an effective means to study tokamak plasma confinement and transport. It can open the outermost magnetic surface, affecting the transport of the border particles and energy; can also induce a magnetic island, and can even induce Clamping drive plasma rotation, thus improving the constraints. The very 多托卡马克 device at home and abroad have carried out or being carried out a study of interaction of magnetic fields and plasma external disturbance, and made a series of achievements in terms of transport and constraints. ITER also plan to try to control the resistive wall mode perturbation field coil. J-TEXT device Huazhong University of Science and Technology, the construction of conventional medium-sized tokamak discharge test is currently being carried out. According to the needs of the structural features of the device and related physical experiments on J-TEXT need plus (m, n), (3,1), (2,1) is the dominant mode of disturbed magnetic field inherent in the 2/1 mode plasma and 3/1 mode resonance effect used for research clamping and transport. To do this we need to complete a disturbance magnetic field coil system, power system control and protection systems. This article detailed calculations TEXT-U device device (J-TEXT predecessor) random perturbations of the magnetic field generated by the magnetic field a single disturbance coil distribution and mode. According to the nature of the superposition of two-dimensional Fourier transform, J-TEXT device based on TEXT-U device randomly perturbed magnetic field coil two disturbances coil, the coil and the coil of the new processing distributed symmetrically in the big ring, in order to better produce the disturbance magnetic field of the (m, n), (3,1), (2,1) and other types of models, the maximum current 7.5kA, the average value of the disturbed magnetic field of about 2 * 10-4BT. According to the a random disturbance magnetic field coil power demand, a capacitor discharge pulse power system control, protection systems. Power system uses a combination of chopper freewheeling, the first low-voltage single-phase controlled rectifier the main capacitor charging energy storage; then through the chopper and freewheeling load current waveform shaping, provide the quasi-trapezoidal current waveform, the maximum amplitude of up to 7.5kA, 50ms flat top. The main capacitor energy storage up to 1.7MJ, a peak output power of up to more than 2MW. The control and protection system uses a combination of software and hardware. Hardware system IPC as the core; Software Systems QNX embedded operating system development platform. The combination of power and its control system for power system simulation. The power-on test results confirmed that the simulation results and test run results are consistent guidance and protection of the safe and reliable operation of the J-TEXT device random disturbance magnetic field power system. Completed the J-TEXT device random disturbance magnetic field system, random perturbations to the magnetic field coils have been installed in place, the power system is powered experimental results show that the power running better, safety and reliability is very high, can carry out the relevant physics experiments.

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CLC: > Industrial Technology > Nuclear technology > Controlled thermonuclear reactions ( fusion reaction theory and experimental facilities) > Thermonuclear device > Magnetic confinement devices > Closed plasma device > Tokamak
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