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Title: Investigations into ion beam emittance and profile monitoring
Author: Tzoganis, Vasileios
ISNI:       0000 0004 6495 5519
Awarding Body: University of Liverpool
Current Institution: University of Liverpool
Date of Award: 2017
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Beam diagnostics systems are essential constituents of any particle accelerator; they reveal the properties of a beam and how it behaves in the machine. This includes: synchrotron light sources and free-electron lasers; high energy accelerators for particle physics experiments; high-intensity hadron accelerators for the generation of exotic beams and spallation sources; much smaller accelerator facilities where cooled beams of specific (exotic) particles are provided for precision experiments and fundamental Physics studies. Without an appropriate set of diagnostic elements, it would simply be impossible to operate any accelerator complex, let alone optimise its performance. This thesis covers investigations into two different beam diagnostics methods. The first part describes work carried out at RIKEN Radioactive Isotope Beam Factory (RIBF) in Japan during October 2013-January 2016. It deals with the development of an online emittance monitor for an ECR ion source that produces low energy beams of various species ranging from protons up to heavier ions such as krypton. The monitor was initially based on an earlier RIKEN prototype which had insufficient performance. After four design iterations and multiple experimental tests the final prototype was integrated at the ion source and experimental measurements were carried out. One of the major challenges was to identify suitable scintillating materials that do not heavily degrade after irradiation with low energy ion beams. Additionally to the emittance monitor, work also focused on optimising the ECR ion source and increasing the beam current by improving the ion extraction. The first and the last year of this PhD were spent at the Cockcroft Institute, UK. Work done there is presented in the second part of this thesis which delves into a non-invasive real-time beam profile monitor based on a supersonic gas jet. This monitor was originally conceived and developed by at the Cockcroft Institute but was never operated successfully in the gas jet mode but only as a residual gas monitor. During this PhD, the monitor was commissioned in gas jet mode, alignment issues that prevented previous operation were identified and addressed and the first experimental results were obtained. Moreover, the vacuum dynamics of the system were explored and additional diagnostics instrumentation for the measurement of the gas jet properties was developed and installed. This thesis presents the design of both beam diagnostics methods, for transverse emittance and transverse profile determination, results from measurements with various beam species and a detailed analysis of their performance. Furthermore, it highlights the challenges of the design, integration, optimisation and real time operation for both instruments.
Supervisor: Welsch, C. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral