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Title: Silicon carbide foam as a support structure for silicon sensors in a vertex detector
Author: Page, Ryan
ISNI:       0000 0004 2738 9271
Awarding Body: University of Bristol
Current Institution: University of Bristol
Date of Award: 2012
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In this thesis a complete study of silicon carbide (SiC) foam is presented. The aim of which is to show that this material is sufficiently understood that it could be used as a support material in the vertex detector at the International Linear Collider (ILC). Through this research a deep understanding of SiC foams has been acquired. This knowledge has come from a combination of machining and material tests, along with detailed analyses of SiC foams at the level of its microstructure. The later was carried out by modelling a foam as a set of tetrakaidecahedra unit cells. These were in turn analysed using Finite Element Analyses. The elastic moduli from these studies were within 16% of the manufacturer's values for SiC foams with relative densities 8%, 12% and 16%. The ability to machine the material was vital if it were to be used to make a support structure. Studies presented here showed that this was indeed possible and intricate components were machined, which led the way for the first all SiC foam vertex detector prototype. This structure was temperature cycled to check its stability. The best obtained flatness relative to room temperature was 8 ± 6 um: in the x - y plane of the ladder, over the temperature range -20°C < T < -lOoC. To ensure that an all SiC foam detector was competitive with the current baselines, a series of performance tests were carried out. One of the benchmark tests was the vertex finding capability at the Z-pole energy. This test showed that all the concepts were within 5% of each other. Also carried out were tests on the impact parameter resolutions and the purity and efficiency of heavy jet favour tagging. The research presented here shows that SiC foam is a credible choice and should be seriously considered in 'any future R&D into vertex detector support structures.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available