Transverse self-fields within an electron bunch moving in an arc of a circle

G.A. Geloni, J.I.M. Botman, O.J. Luiten, M.J. Wiel, van der, M. Dohlus, E.L. Saldin, E.A. Schneidmiller, M.V. Yurkov

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)


As a consequence of motions driven by external forces, self-fields (which are different from the static case) originate within an electron bunch. In the case of magnetic external forces acting on an ultrarelativistic beam, the longitudinal self-interactions are responsible for Coherent Synchrotron Radiation-related phenomena, which have been studied extensively. On the other hand, transverse self-interactions are present too. At the time being, existing theoretical analysis of transverse self-forces deal with the case of a bunch moving along a circular orbit only, without considering the situation of a bending magnet with a finite length. In this paper, we propose an electrodynamical analysis of transverse self-fields which originate, at the position of a test particle, from an ultrarelativistic electron bunch moving in an arc of a circle. The problem is first addressed within a two-particle system. We then extend our consideration to a line bunch with a stepped density distribution, a situation which can be easily generalized to the case of an arbitrary density distribution. Our approach turns out to be also useful in order to obtain a better insight in the physics involved in the case of simple circular motion.
Original languageEnglish
Pages (from-to)230-251
JournalNuclear Instruments and Methods in Physics Research. Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Issue number3
Publication statusPublished - 2004


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