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Updated: Aug 9, 2026

Development of Whispering Gallery Mode Polymeric Micro-optical Electric Field Sensors
Published on: January 29, 2013
Wake field of an electron bunch moving parallel to a dielectric cylinder
1Department of Electrical Engineering, Technion-Israel Institute of Technology, Haifa 32000, Israel.
Abstract:
The wake field of an electron bunch moving parallel to the axis of a dielectric cylinder is being considered. It is shown that for a relativistic bunch (gamma>>1) the circular harmonic of order zero contributes a decelerating force inversely proportional to gamma, whereas the circular harmonics of nonzero order contribute a gamma-independent force. Moreover, the wake linked to the circular harmonic of order zero may grow in space in case the dielectric cylinder consists of an active medium; however, this growth rate does not depend on the value of gamma. On the other hand, no growth is anticipated for the case of circular harmonics of nonzero order.
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