Phys. Rev. ST Accel. Beams 12, 054202 (2009) [9 pages]

Longitudinal beam dynamics studies with space charge in small isochronous ring

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E. Pozdeyev *
BNL, Upton, New York 11973-5000, USA

J. A. Rodriguez
CERN, Geneva, Switzerland

F. Marti and R. C. York
NSCL, MSU, Lansing, Michigan 48824, USA

Received 22 January 2009; published 20 May 2009

Studies of the longitudinal beam dynamics in the small isochronous ring (SIR) at Michigan State University revealed a fast, space-charge driven instability that did not fit the model of the negative mass instability. The observed beam behavior can be explained by the transverse horizontal component of the coherent space-charge force and its effect on the longitudinal motion. This force effectively modifies the slip factor, shifting the isochronous point and enhancing the negative mass instability. This paper presents results of numerical and experimental studies of the longitudinal beam dynamics in SIR and proposes a simple analytical model explaining these results.


©2009 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevSTAB.12.054202
DOI: 10.1103/PhysRevSTAB.12.054202
PACS: 52.59.Sa, 29.27.Bd

* pozdeyev@bnl.gov

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