Self-consistent simulation of radiation and space-charge in high-brightness relativistic electron beams
| dc.contributor.advisor | O'Shea, Patrick G | en_US |
| dc.contributor.advisor | Antonsen, Thomas M. | en_US |
| dc.contributor.author | Gillingham, David | en_US |
| dc.contributor.department | Physics | en_US |
| dc.contributor.publisher | Digital Repository at the University of Maryland | en_US |
| dc.contributor.publisher | University of Maryland (College Park, Md.) | en_US |
| dc.date.accessioned | 2007-09-28T14:57:58Z | |
| dc.date.available | 2007-09-28T14:57:58Z | |
| dc.date.issued | 2007-06-25 | en_US |
| dc.description.abstract | The ability to preserve the quality of relativistic electron beams through transport bend elements such as a bunch compressor chicane is increasingly difficult as the current increases because of effects such as coherent synchrotron radiation (CSR) and space-charge. Theoretical CSR models and simulations, in their current state, often make unrealistic assumptions about the beam dynamics and/or structures. Therefore, we have developed a model and simulation that contains as many of these elements as possible for the purpose of making high-fidelity end-to-end simulations. Specifically, we are able to model, in a completely self-consistent, three-dimensional manner, the sustained interaction of radiation and space-charge from a relativistic electron beam in a toroidal waveguide with rectangular cross-section. We have accomplished this by combining a time-domain field solver that integrates a paraxial wave equation valid in a waveguide when the dimensions are small compared to the bending radius with a particle-in-cell dynamics code. The result is shown to agree with theory under a set of constraints, namely thin rigid beams, showing the stimulation resonant modes and including comparisons for waveguides approximating vacuum, and parallel plate shielding. Using a rigid beam, we also develop a scaling for the effect of beam width, comparing both our simulation and numerical integration of the retarded potentials. We further demonstrate the simulation calculates the correct longitudinal space-charge forces to produce the appropriate potential depression for a converging beam in a straight waveguide with constant dimensions. We then run fully three-dimensional, self-consistent end-to-end simulations of two types of bunch compressor designs, illustrating some of the basic scaling properties and perform a detailed analysis of the output phase-space distribution. Lastly, we show the unique ability of our simulation to model the evolution of charge/energy perturbations on a relativistic bunch in a toroidal waveguide. | en_US |
| dc.format.extent | 1016585 bytes | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.uri | http://hdl.handle.net/1903/7213 | |
| dc.language.iso | en_US | |
| dc.subject.pqcontrolled | Physics, Electricity and Magnetism | en_US |
| dc.subject.pquncontrolled | electrodynamics | en_US |
| dc.subject.pquncontrolled | accelerators | en_US |
| dc.subject.pquncontrolled | beams | en_US |
| dc.subject.pquncontrolled | radiation | en_US |
| dc.title | Self-consistent simulation of radiation and space-charge in high-brightness relativistic electron beams | en_US |
| dc.type | Dissertation | en_US |
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