Publication Date


Document Type


First Advisor

Piot, Philippe

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Physics


Electron beam halos defined as the peripheral fraction of the beam that does not contribute to the front end application. Particles located in the halo can cause damage to the particle accelerator and lower the power and quality of the beam. Being able to measure the beam halo could provide insight on the halo-formation mechanism and ultimately will improve the overall performance and quality of the beam. A halo diagnostic was designed, and a prototype built and commissioned. The diagnostics relies on detecting optical radiation by the electron beam and masking its core to enhance the detection of the halo. Numerical simulations using a simple ABCD ray-tracing program and a wavefront optical software were performed. The built system was characterized using a HeNe laser. A critical element of the system is a digital micromirror device (DMD) capable of dynamically masking the beam core. This work discusses the development of the halo diagnostics and presents some results from its initial commissioning using a HeNe laser system.


75 pages




Northern Illinois University

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NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

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Physics Commons