Structural Design And Performance Research Of Superconducting Magnet System For Neutron Scattering Sample Experiments

The new sample environment of neutron scattering opens up new research fields and cross frontiers,and the sample parameters develop towards extremes,multicondition and multi-field coupling.Superconducting magnet for neutron scattering is the one of the important experimental instrument that meets these conditions.However,the development of the instrument was monopolized by a few foreign companies(Oxford Instruments).The project of "Neutron scattering Sample Environment and related experimental technology" was carried out.The key sub-topic project of the "Neutron scattering superconducting magnet System" was being developed at High Magnetic Field Laboratory,Chinese Academy of Sciences.On the one hand,neutron scattering superconducting magnet system with independent intellectual property rights can meet the demand of magnetic frontier research such as condensed matter quantum materials.On the other hand,it will break the technological monopoly of foreign companies and lay the foundation for the development of the next generation of high magnetic field sample environment.This dissertation mainly emphasizes on the research of electromagnetic design and structural optimization.The primary contents are listed as following:1.The particularity and main components of neutron scattering superconducting magnet,as well as the important technical indexes and design issues of difficulties are introduced.Also,the overall design route of neutron scattering superconducting magnet system is given.2.Duo to the limitations of the configuration of the superconducting magnet,several electromagnetic designs are analyzed and evaluated using electromagnetic simulation of the Finite Element Method.The electromagnetic force distribution of each coil,energy storage and inductance are solved to prepare for the subsequent structure design.3.A structural design scheme of neutron scattering superconducting magnet is proposed in this dissertation.The coil support structure,cavity liquid helium channel and two existing magnet support types are introduced in detail,and the third magnet support type is proposed.According to the specific parameters,three support of the magnet are designed,and the finite element model is simplified.4.This dissertation proposed a process and method for optimization design of magnet support.Two failure modes of the main magnet support model are discussed.According to the specific parameters,the parameterized electromagnetic and structural coupling finite element model of the magnet support is constructed,and the optimization calculation is carried out.At last,the optimization result is given.5.The structural design of the cryostat for the superconducting magnet is proposed.Based on the design,heat load calculation and finite element heat transfer simulation are analyzed.The first cryogenic test of the superconducting coil was carried out.Compared the measured strain values with calculated values for finite element model,the effectiveness of the finite element model in the optimization calculation and stress analysis is also verified.