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Graduate Student Seminar - 02/27/2009

"Beam Emittance Measurements Using Optical Transition Radiation"

by Christos Papadopoulos

Friday, February 27, 2009 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Professor Patrick O'Shea

Particle accelerators have a wide variety of uses in areas as diverse as high-energy physics experiments, light and neutron sources, or inertial fusion machines. For most of these applications, the basic requirements on the particle beam are that it should have (a) high current, that there are a large number of particles, and (b) low emittance,  that we are able to focus the beam into a small spot. In this presentation, we will propose a technique for measuring the beam emittance based on the widely deployed Optical Transition Radiation (OTR) method. OTR has been used to simultaneously measure the beam size and the beam divergence, or velocity spread. Motivated by this, we will present the algorithms that relate the size and divergence measurements from OTR to the beam emittance and discuss the experimental implications.

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