Progress of the PEP-II-B-factory

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PEP-II is an e{sup +}e{sup -} B-Factory Collider located at SLAC operating at the Upsilon 4S resonance. PEP-II has delivered, over the past five years, an integrated luminosity to the BaBar detector of over 139 fb{sup -1} and has reached a luminosity of 6.58 x 10{sup 36}/cm{sup 2}/s. Steady progress is being made in reaching higher luminosity. The goal over the next several years is to reach a luminosity of at least 2 x 10{sup 34}/cm{sup 2}/s. The accelerator physics issues being addressed in PEP-II to reach this goal include the electron cloud instability, beam-beam effects, parasitic beam-beam effects, high ... continued below

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Seeman, J.; Browne, M.; Cai, Y.; Colocho, W.; Decker, F.-J.; Donald, M. et al. June 1, 2003.

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PEP-II is an e{sup +}e{sup -} B-Factory Collider located at SLAC operating at the Upsilon 4S resonance. PEP-II has delivered, over the past five years, an integrated luminosity to the BaBar detector of over 139 fb{sup -1} and has reached a luminosity of 6.58 x 10{sup 36}/cm{sup 2}/s. Steady progress is being made in reaching higher luminosity. The goal over the next several years is to reach a luminosity of at least 2 x 10{sup 34}/cm{sup 2}/s. The accelerator physics issues being addressed in PEP-II to reach this goal include the electron cloud instability, beam-beam effects, parasitic beam-beam effects, high RF beam loading, shorter bunches, lower beta y*, interaction region operation, and coupling control. A view of the PEP-II tunnel is shown in Figure 1. The present parameters of the PEP-II B-Factory are shown in Table 1 compared to the design. The present peak luminosity is 219% of design and the best integrated luminosity per month is 7.4 fb{sup -1} that is 225% of design. The best luminosity per month is shown in Figure 2. The integrated luminosity over a month is shown in Figure 3 and the total integrated luminosity in shown in Figure 4. The progress in luminosity has come from correcting the orbits, adding specific orbit bumps to correct coupling and dispersion issues, lowering the beta y* in the LER, and moving the fractional horizontal tunes in both rings to just above the half integer (<0.52).

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  • 2003 Particle Accelerator Conference, Portland, May 12-16, 2003

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  • Report No.: LBNL--55924
  • Report No.: CBP Note - 622
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 842976
  • Archival Resource Key: ark:/67531/metadc786294

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • June 1, 2003

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  • Dec. 3, 2015, 9:30 a.m.

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  • Dec. 12, 2016, 12:48 p.m.

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Seeman, J.; Browne, M.; Cai, Y.; Colocho, W.; Decker, F.-J.; Donald, M. et al. Progress of the PEP-II-B-factory, article, June 1, 2003; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc786294/: accessed June 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.