Changing the PEP-II Center-of-Mass Energy Down to 10 GeV and up to 11 GeV

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PEP-II, the SLAC, LBNL, LLNL B-Factory was designed and optimized to run at the Upsilon 4S resonance (10.580 GeV with an 8.973 GeV e- beam and a 3.119 GeV e+ beam). The interaction region (IR) used permanent magnet dipoles to bring the beams into a head-on collision. The first focusing element for both beams was also a permanent magnet. The IR geometry, masking, beam orbits and beam pipe apertures were designed for 4S running. Even though PEP-II was optimized for the 4S, we successfully changed the center-of-mass energy (E{sub cm}) down to the Upsilon 2S resonance and completed an E{sub ... continued below

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3 pages

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Sullivan, M; Bertsche, K.; Novokhatski, A.; Seeman, J.; Wienands, U. & /SLAC May 20, 2009.

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PEP-II, the SLAC, LBNL, LLNL B-Factory was designed and optimized to run at the Upsilon 4S resonance (10.580 GeV with an 8.973 GeV e- beam and a 3.119 GeV e+ beam). The interaction region (IR) used permanent magnet dipoles to bring the beams into a head-on collision. The first focusing element for both beams was also a permanent magnet. The IR geometry, masking, beam orbits and beam pipe apertures were designed for 4S running. Even though PEP-II was optimized for the 4S, we successfully changed the center-of-mass energy (E{sub cm}) down to the Upsilon 2S resonance and completed an E{sub cm} scan from the 4S resonance up to 11.2 GeV. The luminosity throughout most of these changes remained near 1 x 10{sup 34} cm{sup -2}s{sup -1}. The E{sub cm} was changed by moving the energy of the high-energy beam (HEB). The beam energy differed by more than 20% which produced significantly different running conditions for the RF system. The energy loss per turn changed 2.5 times over this range. We describe how the beam energy was changed and discuss some of the consequences for the beam orbit in the interaction region. We also describe some of the RF issues that arose and how we solved them as the high-current HEB energy changed.

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3 pages

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  • Contributed to Particle Accelerator Conference (PAC 09), Vancouver, BC, Canada, 4-8 May 2009

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  • Report No.: SLAC-PUB-13635
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 952969
  • Archival Resource Key: ark:/67531/metadc933010

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Office of Scientific & Technical Information Technical Reports

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

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  • May 20, 2009

Added to The UNT Digital Library

  • Nov. 13, 2016, 7:26 p.m.

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  • Dec. 15, 2016, 3:22 p.m.

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Sullivan, M; Bertsche, K.; Novokhatski, A.; Seeman, J.; Wienands, U. & /SLAC. Changing the PEP-II Center-of-Mass Energy Down to 10 GeV and up to 11 GeV, article, May 20, 2009; United States. (digital.library.unt.edu/ark:/67531/metadc933010/: accessed December 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.