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Physical Review Letters – 8 April 2005
Volume 94, Issue 13

Images of part of a cycle of "hollow" electron beam evolution in the Duke storage ring; the beam consists of a large outside ring and a small core beam. Initially there is a phase of slow migration from ring to core (images 1-5), followed by a rapid core burst when the charge in the core becomes unstable (6-8), after which the beam quickly returns to the initial configuration to start the cycle again. [Y. K. Wu, J. Li, and J. Wu, Phys. Rev. Lett. 94, 134802 (2005)]

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