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Title: Magnet design using finite element analysis
Author: Witte, Holger
ISNI:       0000 0001 3571 2161
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2007
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This thesis applies the method of finite element software to calculate pulsed high field magnets. The calculations address the structural and thermal load of pulsed magnets during discharge and at peak field. The most successful currently-used coil designs from different magnet laboratories are assessed with these methods. The results are compared against wellestablished analytic programs; arising differences are discussed. Particular emphasis is on the coil designs developed for the pulsed field facility in the Clarendon Laboratory, Oxford, UK. The facility, named after Nikolas Kurti, is described and classified. The coil designs are based on a novel high strength copper-silver conductor, which is compared to other common conductors. In combination with the novel calculation methods this established a new quality of high magnetic fields: the local record was broken in March 2007 by creating the highest magnetic field to date in the Clarendon Laboratory. Present and future trends in pulsed magnet design are discussed and evaluated. These include a discussion of foil coils, braiding of conductors and the matching of conductors with suitable reinforcement. Particular emphasis is placed on the verification of the simulation results. To this end a finite element method is developed which can be used to predict the irreversible change of the inductance of pulsed magnets due to plastic deformation. Preliminary results of residual strains in a magnet using neutron scattering are also considered. Another focus is on reducing the cool-down time of pulsed magnets by using rapid cooling methods. The concept of the so-called 'cooling disc' is new in this respect. Experimental and theoretical results are contrasted with other methods. Other work has contributed to the design of the magnetic channel of the international Muon Ionization Cooling Experiment; this thesis gives a summary. The work comprises force calculations, quench considerations and magnetic shielding issues.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available