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Title: ALICE tomography section : phase-space measurements and analysis
Author: Ibison, Mark
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2013
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The technique of phase-space tomography applies the principles of tomographic re-construction to the diagnostics of particle accelerator beams. It is one of the few methods capable of mapping phase-space in detail, using instrumentation commonly available on research accelerator beam-lines, that is, beam profile imaging and variable focussing magnets. This thesis studies the effects of space-charge in the particle bunch on the measurement of transverse phase-space, in the horizontal and vertical dimensions, by the beam tomography method. It applies a novel `comparative' method of using quadrupole tomography scanning to look for these effects, over the length of the diagnostic section of the injection line which transfers the electron beam from the ALICE accelerator to the Electron Model for Many Applications (EMMA) ring at the Daresbury Laboratory. Simulations of the full tomographic process, from beam profle imaging to reconstruction, are developed in the particle tracking code GPT. These are used to investigate space-charge effects, in support of the experimental studies. The concept of `normalised phase-space' is described, in the context of tomography with a very limited number of views, presenting its advantages as applied to a specific type of reconstruction algorithm, the Maximum Entropy Technique. Recommendations for future work in this field are suggested, with possible application both for new machines at the Daresbury Laboratory, and at other accelerator facilities.
Supervisor: Hock, Kai; Wolski, Andrzej Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QC Physics