Commissioning the 90 Degree Lattice for the PEP II High Energy Ring

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In order to benefit from further reduction of the vertical IP beta function of the PEP-II high energy ring (HER) the bunch length should be reduced. This will be achieved by changing the phase advance from 60 degree to 90 degree in the four arcs not adjacent to the IR region, thus reducing momentum compaction by about 30% and reducing bunch length from a present 12 mm down to 8.5 mm at low beam current. In preparation to implement the 90 degree lattice the main HER quadrupole and sextupole strings and their power supplies have been reconfigured. The synchrotron tune ... continued below

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3 pages

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Wittmer, W.; Cai, Y.; Cheng, W.X.; Colocho, W.S.; Decker, F.J.; Ecklund, S. et al. November 2, 2011.

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In order to benefit from further reduction of the vertical IP beta function of the PEP-II high energy ring (HER) the bunch length should be reduced. This will be achieved by changing the phase advance from 60 degree to 90 degree in the four arcs not adjacent to the IR region, thus reducing momentum compaction by about 30% and reducing bunch length from a present 12 mm down to 8.5 mm at low beam current. In preparation to implement the 90 degree lattice the main HER quadrupole and sextupole strings and their power supplies have been reconfigured. The synchrotron tune initially will be lower but can be brought back by raising the rf voltage. Beam emittance is held at 48 nmr by introducing a significant dispersion beat in the arcs. The lattice was successfully commissioned at currents up to 800 mA in August 2007. In this paper we will compare the actual machine with the predicted behaviour, explain the correction strategies used and give an overall assessment of the operation and the benefit of the new lattice configuration.

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3 pages

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  • Journal Name: Conf.Proc.C0806233:wepp044,2008; Conference: EPAC'08, 11th European Particle Accelerator Conference, 23-27 June 2008, Genoa, Italy

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  • Report No.: SLAC-PUB-14669
  • Grant Number: AC02-76SF00515
  • Office of Scientific & Technical Information Report Number: 1028702
  • Archival Resource Key: ark:/67531/metadc829224

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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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  • November 2, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Dec. 8, 2016, 2:56 p.m.

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Wittmer, W.; Cai, Y.; Cheng, W.X.; Colocho, W.S.; Decker, F.J.; Ecklund, S. et al. Commissioning the 90 Degree Lattice for the PEP II High Energy Ring, article, November 2, 2011; United States. (digital.library.unt.edu/ark:/67531/metadc829224/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.