Emittance growth due to decoherence and wakefields

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Suddenly induced coherent centroid oscillations about the closed orbit will decohere due to nonlinearities in the magnetic optics - at the expense of a stored beam`s emittance. Collective effects mediated by the vacuum chamber wakefield and dependent on the beam current, can however damp the coherent oscillations-ameliorating the emittance growth. Closed form expressions for both the beam centroid and the beam size are obtained in the absence of collective effects. Simultaneous turn-by-turn measurements of beam centroid and size in the SLC damping ring are presented, and the importance and intricacy of collective effects is discussed.

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3 p.

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Minty, M.G.; Chao, A.W. & Spence, W.L. May 1, 1995.

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Description

Suddenly induced coherent centroid oscillations about the closed orbit will decohere due to nonlinearities in the magnetic optics - at the expense of a stored beam`s emittance. Collective effects mediated by the vacuum chamber wakefield and dependent on the beam current, can however damp the coherent oscillations-ameliorating the emittance growth. Closed form expressions for both the beam centroid and the beam size are obtained in the absence of collective effects. Simultaneous turn-by-turn measurements of beam centroid and size in the SLC damping ring are presented, and the importance and intricacy of collective effects is discussed.

Physical Description

3 p.

Notes

INIS; OSTI as DE95012495

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  • 16. Institute of Electrical and Electronic Engineers (IEEE) particle accelerator conference, Dallas, TX (United States), 1-5 May 1995

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  • Other: DE95012495
  • Report No.: SLAC-PUB--95-6815
  • Report No.: CONF-950512--91
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 64158
  • Archival Resource Key: ark:/67531/metadc698757

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  • May 1, 1995

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  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 2, 2016, 5:29 p.m.

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Minty, M.G.; Chao, A.W. & Spence, W.L. Emittance growth due to decoherence and wakefields, article, May 1, 1995; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc698757/: accessed August 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.