This Site umd.edu

Graduate Student Seminar - 05/05/2017

"The Nonlinear Structure of Multipactor"

by Moiz Siddiqi

Friday, May 5, 2017 -- 12:00 p.m.
Large Conference Room, 1207 Energy Research Facility

Advisor:  Prof. Rami Kishek

Multipactor is a vacuum discharge induced by the impact of electrons on a surface due to radio-frequency (RF) electromagnetic fields and secondary electron emission (SEE). Depending on the impact energy and RF phase of the incident electron, a growth in the electron density is possible. Multipactor can lead to device breakdown in many applications, such as particle accelerator structures, RF systems, satellite communication equipment, and microwave components. Conventional analyses make simplified assumptions that make the electron trajectories analytically tractable. In this talk, a new theoretical treatment of multipactor using iterative maps and other concepts from chaos theory is introduced that makes no such a priori assumptions. It does so by globally analyzing the structure of dynamical space, resulting in bifurcation diagrams that predict susceptibility to multipactor over a wide range of parameters. Computational results will be presented and tested against theoretical predictions.

For additional information about the IREAP Graduate Student Seminars, contact Linus Feder.

Return to the Graduate Student Seminar schedule.