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Title: Ultra-low emittance lattice design for advanced synchrotron light sources
Author: Pulampong, Thapakron
ISNI:       0000 0004 6062 4173
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2015
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Storage ring based synchrotron light sources deliver high brightness radiation generated by high quality electron beam. The electron beam emittance plays an importance role in controlling the brightness and coherence of the radiation output. An extensive design effort is required to optimse the lattice to improve the beam emittance and machine performance. This thesis reports a series of investigations into lattice tuning, modification and full upgrade to improve the machine performance of third generation light sources, using the Diamond storage ring lattice as a model. In the first part of this thesis, the optics functions of the existing lattice are optimised in order to reduce the natural beam emittance. A reduction of 27% is achieved and verified experimentally, although the effects of strong insertion devices (IDs) reduce this improvement. A second study was carried out with the aim of replacing one of the existing double bend achromat (DBA)cell with one and two double-double bend achromat (DDBA) cells providing additional straight sections for IDs. It was proven that the addition of one DDBA cell can be implemented without significant deterioration of the performance of the machine. The case with two DDBA cells however provides a beam lifetime which is only half of the value in the existing machine. A third study was carried out to consider a full lattice upgrade using multibend achromat (MBA) cells aiming for ultra-low emittance. The last part of this thesis concentrates on the study of an improved beam injection scheme employing a pulsed multipole kicker (PM). The aim is to achieve an eficient beam injection while producing a lower perturbation to the stored beam during the injection. Based on particle tracking, the beam injection performance of the scheme is optimised for the existing Diamond and for the one DDBA lattice. The effects of the PM on the stored beam is proven to be negligible. The compatibility of the existing injection system with the new injection scheme is evaluated. Such scheme provides a feasible alternative to the existing injection scheme that could reduce the perturbation during the beam injection during Top-up injection.
Supervisor: Bartolini, Riccardo Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available