Single-Bunch Tune and Beam Size Measurements Along Bunch Trains in PEP-II

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By scanning gated cameras and gated tune monitors across the bunch pattern during normal colliding-bunch operation of PEP-II, the tunes and beam sizes of individual bunches were measured simultaneously in the high and low energy storage rings of PEP-II. The measurements were made with 1561 colliding bunches in PEP-II, arranged in trains of 66 bunches, with each bunch in the train separated by 4.2 ns. The tune and beam size measurements were correlated with the current, luminosity, and specific luminosity of the bunch. The results show a vertical tune shift at the start and end of the mini-trains, a luminosity ... continued below

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4 pages

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Holtzapple, Robert; U., /Alfred; Dujmic, Denis; Fisher, Alan S. & /SLAC June 22, 2005.

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By scanning gated cameras and gated tune monitors across the bunch pattern during normal colliding-bunch operation of PEP-II, the tunes and beam sizes of individual bunches were measured simultaneously in the high and low energy storage rings of PEP-II. The measurements were made with 1561 colliding bunches in PEP-II, arranged in trains of 66 bunches, with each bunch in the train separated by 4.2 ns. The tune and beam size measurements were correlated with the current, luminosity, and specific luminosity of the bunch. The results show a vertical tune shift at the start and end of the mini-trains, a luminosity droop along the mini-train, and specific luminosity drop in the first and last bunches of the train, since they experience a different parasitic crossing on either side of the interaction point (IP).

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4 pages

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  • Presented at Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005

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  • Report No.: SLAC-PUB-11231
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 890307
  • Archival Resource Key: ark:/67531/metadc883892

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  • June 22, 2005

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 1, 2016, 8:23 p.m.

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Holtzapple, Robert; U., /Alfred; Dujmic, Denis; Fisher, Alan S. & /SLAC. Single-Bunch Tune and Beam Size Measurements Along Bunch Trains in PEP-II, article, June 22, 2005; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc883892/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.