title: Enhanced Cherenkov-wake amplification by an active medium.
abstract: A Cherenkov wake confined by perfectly reflecting transverse walls is amplified if the dielectric medium is active. Because of the multiple-reflections process, the effective gain of the wake is enhanced compared to a ray propagating in a straight line. Higher enhancement occurs when the electron velocity is close to the Cherenkov velocity. This Cherenkov wake can then accelerate a second bunch of electrons trailing the first. Gradients larger than 1 GV/m are predicted before saturation becomes a major impediment.
authors.affiliation: Department of Electrical Engineering Technion-Israel Institute of Technology, Haifa 32000, Israel.
authors.forename: Miron
authors.initials: M
authors.lastname: Voin
authors.affiliation: Department of Electrical Engineering Technion-Israel Institute of Technology, Haifa 32000, Israel.
authors.forename: Levi
authors.initials: L
authors.lastname: Schächter