Research On Measurement And Control System In Galatea Magnetic Confinement Device

Nuclear fusion is an effective way to cope with the energy crisis.The Galatea device is a type of non-Tokamak fusion device that uses current carrying coils(myxine)to confine the plasma.Plasma parameter acquisition can fully grasp the dynamic changes of the relevant parameters during the operation of the device,and then analyze the plasma motion law and constraints characteristics.This thesis studies the measurement and control system of Galatea device including sequential control and parameter acquisition.Firstly,the requirements analysis of measurement and control system are performed,the overall operation structure of the Galatea device is built,the hardware structure and operation principle of the vacuum tank,plasma gun,full plasma channel and magnetic trap is analyzed,and the concrete parameters of the device components are definited.The interaction relationship between the sequential control system and the parameter acquisition system are analyzed.The overall design scheme of the sequential control system and the parameter acquisition system are performed.The specific implementation of each system is proposed.Secondly,combining with the operation characteristics of pulse power,the mathematical model of the sequential control of each part of the Galatea device is established,the Advantech PCI-1780 U timer card is selected as the hardware development platform,and the Lab VIEW is used as the software development platform to complete the hardware and software design of the sequential control system.Experiments verify the accuracy of the sequential pulse of the plasma gun,full plasma channel,chute coil,magnetic trap,full plasma channel probe and magnetic trap probe,and the corresponding relation between sequential control pulses of each part of the Galatea device is gived.Then,the research of the pressure distribution in magnetic trap spatial and measurement probes are performed.the collision coupling model of hydrogen plasmas is constructed,and a two-dimensional MHD simulation model based on COMSOL is established.The plasma pressure distribution in the magnetic trap space at different times is simulated and analyzed.A parameter measurement method based on orthogonal probe measurement structure is proposed.the measurement principle and calculation methods of related plasma parameters of magnetic probes,Langmuir probes and orthogonal probes are studied.To study the probe denoising method,the advantages and disadvantages of common wavelet de-noising methods are studied.Wavelet threshold denoising is selected as the probe denoising method.The effect of probe denoising under different wavelet bases is analyzed.Finally,the overall structure of the parameter acquisition system is built,and the realization process of parameter acquisition system is defined.the hardware structure,installation position and external circuit of the magnetic probes,Langmuir probes and orthogonal probes are designed.For the magnetic probe,the calibration method for the coil's total cross-sectional area is proposed,and the integral circuit structure of the magnetic probe is analyzed.The software design of the parameter acquisition system is performed,and the parameter acquisition software of the magnetic probe,Langmuir probe and orthogonal probe is completed,the parameter acquisition software is simulated and tested to realize the parameter acquisition function.