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Graduate Student Seminar - 10/18/2013

"Nonlinear Optics at the University of Maryland Electron Ring"

by Kiersten Ruisard

Friday, October 18, 2013 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Research Asst. Professor Tim Koeth

Conventional accelerators depend on quadrupole and dipole magnets to provide beam focusing and steering. Quadrupole and dipole lattices are well understood, and in the case of alternating gradient lattices, analytically solvable. However, the conventional lattice is very sensitive to perturbations which can lead to resonant beam growth. This sensitivity is further complicated by the addition of significant space charge forces in high intensity machines. A new theory proposes the use of a highly nonlinear but integrable lattice (including sextupole and higher order field components) to damp rational tune resonances as well as halo formation. While a new facility is being built at Fermilab to demonstrate this nonlinear lattice, UMER has the potential to perform a complementary experiment at a much lower cost. Plans at UMER include simulation of the nonlinear integrable optics design and implementation of strong nonlinear optics in the existing ring. The experiment will demonstrate a non-integrable "chaotic bounded" octupole lattice, which is expected to provide many of the same benefits as the integrable lattice.

For additional information about the IREAP Graduate Student Seminars, contact David Meichle at dmeichle at

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