TOMOGRAPHIC MEASUREMENT OF THE PHASE-SPACE DISTRIBUTION OF A SPACE-CHARGE-DOMINATED BEAM

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dc.contributor.advisorO'Shea, Patrick Gen_US
dc.contributor.advisorKishek, Rami Aen_US
dc.contributor.authorStratakis, Diktysen_US
dc.contributor.departmentElectrical Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2008-06-20T05:35:15Z
dc.date.available2008-06-20T05:35:15Z
dc.date.issued2008-04-24en_US
dc.description.abstractMany applications of accelerators, such as free electron lasers, pulsed neutron sources, and heavy ion fusion, require a good quality beam with high intensity. In practice, the achievable intensity is often limited by the dynamics at the low-energy, space-charge dominated end of the machine. Because low-energy beams can have complex distribution functions, a good understanding of their detailed evolution is needed. To address this issue, we have developed a simple and accurate tomographic method to map the beam phase using quadrupole magnets, which includes the effects from space charge. We extend this technique to use also solenoidal magnets which are commonly used at low energies, especially in photoinjectors, thus making the diagnostic applicable to most machines. We simulate our technique using a particle in cell code (PIC), to ascertain accuracy of the reconstruction. Using this diagnostic we report a number of experiments to study and optimize injection, transport and acceleration of intense space charge dominated beams. We examine phase mixing, by studying the phase-space evolution of an intense beam with a transversely nonuniform initial density distribution. Experimental measurements, theoretical predictions and PIC simulations are in good agreement each other. Finally, we generate a parabolic beam pulse to model those beams from photoinjectors, and combine tomography with fast imaging techniques to investigate the time-sliced parameters of beam current, size, energy spread and transverse emittance. We found significant differences between the slice emittance profiles and slice orientation as the beam propagates downstream. The combined effect of longitudinal nonuniform profiles and fast imaging of the transverse phase space provided us with information about correlations between longitudinal and transverse dynamics that we report within this dissertation.en_US
dc.format.extent10838266 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/8121
dc.language.isoen_US
dc.subject.pqcontrolledEngineering, Electronics and Electricalen_US
dc.subject.pqcontrolledPhysics, Fluid and Plasmaen_US
dc.subject.pqcontrolledPhysics, Electricity and Magnetismen_US
dc.subject.pquncontrolledUniversity of Maryland Electron Ringen_US
dc.subject.pquncontrolledacceleratorsen_US
dc.subject.pquncontrolledbeamen_US
dc.subject.pquncontrolledspace chargeen_US
dc.subject.pquncontrolledelectron opticsen_US
dc.subject.pquncontrolledphase-space tomographyen_US
dc.titleTOMOGRAPHIC MEASUREMENT OF THE PHASE-SPACE DISTRIBUTION OF A SPACE-CHARGE-DOMINATED BEAMen_US
dc.typeDissertationen_US

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