Abstract:
Anomalous hollow electron beams have been
recently observed in the Duke storage ring.
With a single bunch beam in a lattice with a
negative chromaticity, a hollow beam can be
created. This beam consists of a solid core
beam inside and a large ring beam outside. In
this paper, we report the measurements of the
hollow beam phenomenon, including its
distinct image pattern and spectrum
signature, and its evolution with time. By
capturing the post-instability bursting beam,
the hollow beam is a unique model system for
studying transverse instabilities, in
particular, the interplay of the wakefield
and lattice nonlinearity. The hollow beam can
also be used as a tool to study linear and
nonlinear particle dynamics in the storage ring.
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