Monitoring of Interaction-Point Parameters Using the 3-Dimensional Luminosity Distribution Measured at PEP-II

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The 3-D luminosity distribution at the IP of the SLAC B-Factory is monitored using e{sup +}e{sup -} {yields} e{sup +}e{sup -}, {mu}{sup +}{mu}{sup -} events reconstructed online in the BABAR detector. The transverse centroid and spatial orientation of the luminosity ellipsoid reliably monitor IP orbit drifts. The longitudinal centroid is sensitive to small variations in the average relative RF phase of the beams and provides a detailed measurement of the phase transient along the bunch train. The longitudinal luminosity distribution depends on the e{sup +,-} overlap bunch length and the vertical IP {beta}-functions. Relative variations in horizontal luminous size are ... continued below

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3 pages

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Viaud, B.F.; U., /Montreal; Kozanecki, W.; /DAPNIA, Saclay; O'Grady, C.; Thompson, J. et al. July 28, 2006.

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The 3-D luminosity distribution at the IP of the SLAC B-Factory is monitored using e{sup +}e{sup -} {yields} e{sup +}e{sup -}, {mu}{sup +}{mu}{sup -} events reconstructed online in the BABAR detector. The transverse centroid and spatial orientation of the luminosity ellipsoid reliably monitor IP orbit drifts. The longitudinal centroid is sensitive to small variations in the average relative RF phase of the beams and provides a detailed measurement of the phase transient along the bunch train. The longitudinal luminosity distribution depends on the e{sup +,-} overlap bunch length and the vertical IP {beta}-functions. Relative variations in horizontal luminous size are detectable at the micron level. In addition to continuous on-line monitoring of all the parameters above, we performed detailed studies of their variation along the bunch train to investigate a temporary luminosity degradation. We also compare {beta}*{sub y} measurements, collected over a year of high-luminosity operation, with HER and LER lattice functions measured by resonant transverse excitation. Our bunch-length measurements are consistent with those obtained by other methods and provide direct evidence for bunch-length modulation.

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3 pages

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  • Contributed to European Particle Accelerator Conference (EPAC 06), Edinburgh, Scotland, 26-30 Jun 2006

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  • Report No.: SLAC-PUB-11900
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 887471
  • Archival Resource Key: ark:/67531/metadc876887

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  • July 28, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 29, 2016, 8:30 p.m.

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Viaud, B.F.; U., /Montreal; Kozanecki, W.; /DAPNIA, Saclay; O'Grady, C.; Thompson, J. et al. Monitoring of Interaction-Point Parameters Using the 3-Dimensional Luminosity Distribution Measured at PEP-II, article, July 28, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc876887/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.