Anomalous Hollow Electron Beams in a Storage Ring

Y. K. Wu, J. Li, and J. Wu
Phys. Rev. Lett. 94, 134802 – Published 7 April 2005

Abstract

This Letter reports the first observations of an anomalous hollow electron beam in the Duke storage ring. Created by exciting the single-bunch beam in a lattice with a negative chromaticity, the hollow beam consists of a solid core inside and a large ring outside. We report the detailed measurements of the hollow beam phenomenon, including its distinct image pattern, spectrum signature, and its evolution with time. By capturing the postinstability bursting beam, the hollow beam is a unique model system for studying the transverse instabilities, in particular, the interplay of the wakefield and the lattice nonlinearity. In addition, the hollow beam can be used as a powerful tool to study the linear and nonlinear particle dynamics in the storage ring.

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  • Received 24 November 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.134802

©2005 American Physical Society

Authors & Affiliations

Y. K. Wu1,*, J. Li1, and J. Wu2

  • 1Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA
  • 2Stanford Linear Accelerator Center, Stanford University, Stanford, California 94309, USA

  • *Electronic address: wu@fel.duke.edu

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Issue

Vol. 94, Iss. 13 — 8 April 2005

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