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Graduate Student Seminar - 02/24/2012

"Experimental Observations of Solitons on Electron Beams in UMER"

by Yichao Mo

Friday, February 24, 2012 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisors:  Research Professor Rami Kishek and Professor Patrick O'Shea

The logitudinal dynamics of space-charge dominated beams plays an important role in particle accelerators and other applications such as heavy ion fusion and free electron lasers (FELs). All beams are space-charge dominated near the source. By means of experiments on the University of Maryland Electron Ring (UMER), we studied how a perturbation to the line charge density could affect the beam propagation. When starting with large-amplitude perturbations, we have observed for the first time in charged particle beams, solitary waves for which the nonlinear steepening exactly balances the wave dispersion, leading to persistent waves that preserve their shapes over a long distance.

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