Dissertation/Thesis Abstract

Beam halo creation and propagation in the University of Maryland Electron Ring
by Papadopoulos, Christos F., Ph.D., University of Maryland, College Park, 2009, 119; 3372979
Abstract (Summary)

In this thesis we discuss the phenomenon of halo creation in charged particle beams. For this, we combine analytical, numerical and experimental work, which focuses on the University of Maryland Electron Ring, but is applicable to a wide range of accelerators in the same intensity regime.

We find that the details of the beam distribution do not affect the structure of the halo, but are nonetheless important as they determine the number of particles in the halo and whether the latter can be regenerated. Furthermore, we show that the halo in configuration and velocity space comprises of the same particles, a prediction that has great importance for halo removal and diagnostics. In particular, we show that even in the case of ideal halo removal in phase space, the complicated internal dynamics of the beam core lead to halo regeneration.

Following on previous work, we construct a theoretical particle-core model that includes skew quadrupoles and compare our results to simulations and experiments. The agreement between these approaches is satisfactory, within the constraints of each case.

Indexing (document details)
Advisor: O'Shea, Patrick G., Kishek, Rami A.
Commitee: Dorland, William, Ellis, Richard F., Granatstein, Victor L., Hassam, Adil B.
School: University of Maryland, College Park
Department: Physics
School Location: United States -- Maryland
Source: DAI-B 70/09, Dissertation Abstracts International
Subjects: Electromagnetics, Plasma physics, Particle physics
Keywords: Beam halos, Collimation, Halo creation, Intense beams, Particle accelerators, Particle core model, Skew quadrupoles
Publication Number: 3372979
ISBN: 978-1-109-38346-1
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