Combined Phase SpaceCharacterization at the PEP-II IP using Single-beam and Luminous-region Measurements

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We present a novel method to characterize the e{sup {+-}} phase space at the IP of the SLAC B-factory, that combines single-beam measurements with a detailed mapping of luminous-region observables. Transverse spot sizes are determined in the two rings with synchrotron-light monitors and extrapolated to the IP using measured lattice functions. The specific luminosity, which is proportional to the inverse product of the overlap IP beam sizes, is continuously monitored using radiative/Bhabha events. The spatial variation of the luminosity and of the transverse-boost distribution of the colliding e{sup {+-}}, are measured using e{sup +}e{sup -} {yields} {mu}{sup +}{mu}{sup -} events ... continued below

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3 pages

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Bevan, A.; /Queen Mary, U. of London; Kozanecki, W.; /Saclay; Viaud, B.; U., /Montreal et al. June 23, 2006.

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We present a novel method to characterize the e{sup {+-}} phase space at the IP of the SLAC B-factory, that combines single-beam measurements with a detailed mapping of luminous-region observables. Transverse spot sizes are determined in the two rings with synchrotron-light monitors and extrapolated to the IP using measured lattice functions. The specific luminosity, which is proportional to the inverse product of the overlap IP beam sizes, is continuously monitored using radiative/Bhabha events. The spatial variation of the luminosity and of the transverse-boost distribution of the colliding e{sup {+-}}, are measured using e{sup +}e{sup -} {yields} {mu}{sup +}{mu}{sup -} events reconstructed in the BABAR detector. The combination of these measurements provide constraints on the emittances, horizontal and vertical spot sizes, angular divergences and {beta} functions of both beams at the IP during physics data-taking. Preliminary results of this combined spot-size analysis are confronted with independent measurements of IP {beta}-functions and overlap IP beam sizes at low beam current.

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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-11904
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 884879
  • Archival Resource Key: ark:/67531/metadc892292

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  • June 23, 2006

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  • Sept. 23, 2016, 2:42 p.m.

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  • Dec. 8, 2016, 2:58 p.m.

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Bevan, A.; /Queen Mary, U. of London; Kozanecki, W.; /Saclay; Viaud, B.; U., /Montreal et al. Combined Phase SpaceCharacterization at the PEP-II IP using Single-beam and Luminous-region Measurements, article, June 23, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc892292/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.