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Title: Performance of the PEP-II B-Factory Collider at SLAC

Abstract

PEP-II is an e{sup +}e{sup -} asymmetric B-Factory Collider located at SLAC operating at the Upsilon 4S resonance (3.1 GeV x 9 GeV). It has reached a luminosity of 9.21 x 10{sup 33}/cm{sup 2}/s and has delivered an integrated luminosity of 710 pb{sup -1} in one day. PEP-II has delivered, over the past six years, an integrated luminosity to the BaBar detector of over 262 fb{sup -1}. PEP-II operates in continuous injection mode for both beams boosting the integrated luminosity. The peak positron current has reached 2.45 A in 1588 bunches. Steady progress is being made in reaching higher luminosity. The goal over the next several years is to reach a luminosity of 2.1 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}*{sub y} interaction region operation, and coupling control. Figure 1 shows the PEP-II tunnel.

Authors:
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Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
877216
Report Number(s):
SLAC-PUB-11727
TRN: US0601304
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Prepared for Particle Accelerator Conference (PAC 05), Knoxville, Tennessee, 16-20 May 2005
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; CLOUDS; ELECTRONS; INSTABILITY; LUMINOSITY; PERFORMANCE; PHYSICS; POSITRONS; RESONANCE; STANFORD LINEAR ACCELERATOR CENTER; Accelerators,ACCPHY

Citation Formats

Seeman, J., Browne, M., Cai, Y., Colocho, W., Decker, F.J., Donald, M.H., Ecklund, S., Erickson, R.A., Fisher, A.S., Fox, J.D., Heifets, S.A., Iverson, R.H., Kulikov, A., Li, N., Novokhatski, A., Ross, M.C., Schuh, P., Smith, T.J., Sonnad, K.G., Stanek, M., Sullivan, M.K., and /SLAC /Frascati /DSM, DAPNIA, Saclay /LBL, Berkeley /Orsay, IPN. Performance of the PEP-II B-Factory Collider at SLAC. United States: N. p., 2006. Web.
Seeman, J., Browne, M., Cai, Y., Colocho, W., Decker, F.J., Donald, M.H., Ecklund, S., Erickson, R.A., Fisher, A.S., Fox, J.D., Heifets, S.A., Iverson, R.H., Kulikov, A., Li, N., Novokhatski, A., Ross, M.C., Schuh, P., Smith, T.J., Sonnad, K.G., Stanek, M., Sullivan, M.K., & /SLAC /Frascati /DSM, DAPNIA, Saclay /LBL, Berkeley /Orsay, IPN. Performance of the PEP-II B-Factory Collider at SLAC. United States.
Seeman, J., Browne, M., Cai, Y., Colocho, W., Decker, F.J., Donald, M.H., Ecklund, S., Erickson, R.A., Fisher, A.S., Fox, J.D., Heifets, S.A., Iverson, R.H., Kulikov, A., Li, N., Novokhatski, A., Ross, M.C., Schuh, P., Smith, T.J., Sonnad, K.G., Stanek, M., Sullivan, M.K., and /SLAC /Frascati /DSM, DAPNIA, Saclay /LBL, Berkeley /Orsay, IPN. Fri . "Performance of the PEP-II B-Factory Collider at SLAC". United States. doi:. https://www.osti.gov/servlets/purl/877216.
@article{osti_877216,
title = {Performance of the PEP-II B-Factory Collider at SLAC},
author = {Seeman, J. and Browne, M. and Cai, Y. and Colocho, W. and Decker, F.J. and Donald, M.H. and Ecklund, S. and Erickson, R.A. and Fisher, A.S. and Fox, J.D. and Heifets, S.A. and Iverson, R.H. and Kulikov, A. and Li, N. and Novokhatski, A. and Ross, M.C. and Schuh, P. and Smith, T.J. and Sonnad, K.G. and Stanek, M. and Sullivan, M.K. and /SLAC /Frascati /DSM, DAPNIA, Saclay /LBL, Berkeley /Orsay, IPN},
abstractNote = {PEP-II is an e{sup +}e{sup -} asymmetric B-Factory Collider located at SLAC operating at the Upsilon 4S resonance (3.1 GeV x 9 GeV). It has reached a luminosity of 9.21 x 10{sup 33}/cm{sup 2}/s and has delivered an integrated luminosity of 710 pb{sup -1} in one day. PEP-II has delivered, over the past six years, an integrated luminosity to the BaBar detector of over 262 fb{sup -1}. PEP-II operates in continuous injection mode for both beams boosting the integrated luminosity. The peak positron current has reached 2.45 A in 1588 bunches. Steady progress is being made in reaching higher luminosity. The goal over the next several years is to reach a luminosity of 2.1 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}*{sub y} interaction region operation, and coupling control. Figure 1 shows the PEP-II tunnel.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Mar 03 00:00:00 EST 2006},
month = {Fri Mar 03 00:00:00 EST 2006}
}

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  • The design of the lattice for the High Energy Ring (HER) of the SLAC B-Factory has several special features, notably provision for octupole compensation of amplitude dependent tune shift effects and a beta-beat scheme for semi-local chromaticity correction. In the arcs adjacent to the interaction point (IP) the beta functions are enhanced to allow the use of non-interlaced sextupoles to compensate the chromaticity of the interaction region. A closed bump of beta {open_quotes}mismatch{close_quotes} is generated by two vertically focusing quadrupoles spaced 2 betatron wavelengths apart. The beta-beat has two advantages: it enhances the ratio between the horizontal and vertical betamore » functions at the sextupoles and, because of the locally higher beta function, allows weaker sextupoles to be used. The standard design uses a 60 degree/cell lattice but a 90 degree/cell lattice may also be used if lower emittances and momentum compaction factor are desired.« less
  • The Beam-Position Monitors (BPM) for the PEP-II B Factory consist of four 1.5-cm diameter button style pickups mounted on the diagonals of the quadrupole vacuum chambers. Before installation of the vacuum chambers in the quadrupole assemblies, the electrical center of the BPMs is measured with respect to the mechanical center in a calibration test stand. In this paper the calibration test stand is described and the precision and accuracy of the calibrations are presented. After installation of the quadrupole assemblies in the PEP-II tunnel, the passive attenuation for each channel of the system is measured to preserve the accuracy ofmore » the calibration. Finally, the active electronics includes an onboard calibrator. Results for these portions of the calibration are presented.« less
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  • To improve the understanding of accelerator-induced backgrounds at the SLAC B-Factory, we simulate lost particle backgrounds in the BABAR detector originating from beam-gas interactions and radiative Bhabha scatters. We have extended the GEANT4-based BABAR detector simulation to include beam-line components and magnetic fields up to 8.5 m away from the interaction point. We describe the simulation model and then compare preliminary predicted background levels with measurements from dedicated single- and colliding-beam experiments.
  • No abstract prepared.