| The design of MBA-Lattice allows more dipole magnets in a short distance with high gradient quadrupole magnet,achieving lower beam emittance.The magnetic field gradient of the quadrupole magnets for DLSR are at least 4-5 times higher than the quadrupole magnets in SSRF.The poles of a conventional high gradient quadrupole magnet are usually in the saturation state.The magnetic efficiency is generally low.In addition,there are other types of high gradient quadrupoles such as superconducting quadrupole,permanent magnet quadrupole and so on which have different difficulties and limitations.In this dissertation,the excitation characteristics of several different types of quadrupole magnet are studied by simulation.A type of novel high gradient quadrupole magnet is developed by installing permanent magnets on both sides of the poles to improve the gradient and its excitation characteristics and magnetic field error are studied and measured.The development of high gradient quadrupole magnets has great significance for the development of synchrotron radiation source.In this dissertation,the development and trend of synchrotron radiation source,the research status of high gradient quadrupole magnet worldwide and the significance of the development of high gradient quadrupole magnet are described.According to the theory of quadrupole magnet,the excitation characteristics of different types of quadrupole magnet are studied and discussed.A novel high gradient quadrupole magnet is studied and compared with other types of quadrupole magnet.Then this dissertation mainly introduces the development of a prototype of the novel high gradient quadrupole magnet,including physical design and optimization,mechanical design,mechanical analysis,processing technology and so on.During the physical design,the magnetic field quality is optimized and the influence of permanent magnets on the magnetic field quality is studied.During the mechanical design,the coiling parameters and the mechanical structure is designed and analyzed.The processing technology of the prototype is discussed,and the prototype is tested after machining.Finally,the magnetic measurement device and the magnetic measurement result of the prototype are introduced.The magnetic measurement results are good agreement with the simulation results.The feasibility of this novel high gradient quadrupole magnet is proved by the development of the prototype and magnetic measurement results.The research results of this dissertation provide technical support for the development of synchrotron radiation devices in the future. |
