A coupled-bunch ion instability in the SLC electron damping ring

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Under abnormally poor vacuum conditions in the electron damping ring, described in a companion paper at this conference, an emittance blowup was observed related to a transverse instability. The instability was only observed with two bunches in the ring, and could not be seen with single bunch operation, even at the same total beam current as for the two bunches. Measurements of the transverse Beam Transfer Function indicate strong coupling between the two bunches when ions are present. This is described in terms of a simple model where the oscillating ion cloud provides the coupling between the two bunches. The ... continued below

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5 p.

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Krejcik, P. May 1, 1997.

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Description

Under abnormally poor vacuum conditions in the electron damping ring, described in a companion paper at this conference, an emittance blowup was observed related to a transverse instability. The instability was only observed with two bunches in the ring, and could not be seen with single bunch operation, even at the same total beam current as for the two bunches. Measurements of the transverse Beam Transfer Function indicate strong coupling between the two bunches when ions are present. This is described in terms of a simple model where the oscillating ion cloud provides the coupling between the two bunches. The frequency shift due to coupling can also cause the ion cloud to become unstable, and disappear, when the betatron tune of the electron bunch is just below the 1/2 integer.

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5 p.

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INIS; OSTI as DE97007339

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  • 17. IEEE particle accelerator conference, Vancouver (Canada), 12-16 May 1997

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  • Other: DE97007339
  • Report No.: SLAC-PUB--7545
  • Report No.: CONF-970503--276
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 524869
  • Archival Resource Key: ark:/67531/metadc697964

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  • May 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Feb. 2, 2016, 5:25 p.m.

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Krejcik, P. A coupled-bunch ion instability in the SLC electron damping ring, article, May 1, 1997; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc697964/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.