Colliders
Accel/Storage Rings 02: Lepton Colliders
Paper Title Page
MOOCN4
 Status of the KEKB Upgrade  
 
  • J.W. Flanagan
    KEK, Ibaraki, Japan
  
  In the first half of 2010, KEKB will stop operation for a high-luminosity upgrade that should last about three years. This major reconstruction includes, among other items, a new low-emittance optics, crab-waist collisions, a C-band linac, a damping ring, new vacuum chambers with better electron-cloud mitigation, a "charge swap" between the high- and low-energy rings, etc. The speaker will review the strategy and status of the KEKB upgrade, together with the expected luminosity performance of the upgraded collider.  
slides icon Slides MOOCN4 [3.421 MB]  
 
TUOAN1 SuperB: Next-Generation e+e− B-factory Collider 690
 
  • A. Novokhatski, K.J. Bertsche, A. Chao, Y. Nosochkov, J.T. Seeman, M.K. Sullivan, U. Wienands, W. Wittmer
    SLAC, Menlo Park, California, USA
  • M.A. Baylac, O. Bourrion, N. Monseu, C. Vescovi
    LPSC, Grenoble, France
  • S. Bettoni
    CERN, Geneva, Switzerland
  • M.E. Biagini, R. Boni, M. Boscolo, T. Demma, A. Drago, M. Esposito, S. Guiducci, M.A. Preger, P. Raimondi, S. Tomassini, M. Zobov
    INFN/LNF, Frascati (Roma), Italy
  • A.V. Bogomyagkov, E.B. Levichev, S.A. Nikitin, P.A. Piminov, D.N. Shatilov, S.V. Sinyatkin, P. Vobly
    BINP SB RAS, Novosibirsk, Russia
  • B. Bolzon, L. Brunetti, A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux, France
  • A. Chancé
    CEA, Gif-sur-Yvette, France
  • P. Fabbricatore, S. Farinon, R. Musenich
    INFN Genova, Genova, Italy
  • S.M. Liuzzo, E. Paoloni
    University of Pisa and INFN, Pisa, Italy
  • I.N. Okunev
    BINP, Novosibirsk, Russia
  • F. Poirier, C. Rimbault, A. Variola
    LAL, Orsay, France
  
  Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515.
The SuperB international team continues to optimize the design of an electron-positron collider, which will allow the enhanced study of the origins of flavor physics. The project combines the best features of a linear collider (high single-collision luminosity) and a storage-ring collider (high repetition rate), bringing together all accelerator physics aspects to make a very high luminosity of 1036 cm-2 s-1. This asymmetric-energy collider with a polarized electron beam will produce hundreds of millions of B-mesons at the Y(4S) resonance. The present design is based on extremely low emittance beams colliding at a large Piwinski angle to allow very low ßy* without the need for ultra short bunches. Use of crab-waist sextupoles will enhance the luminosity, suppressing dangerous resonances and allowing for a higher beam-beam parameter. The project has flexible beam parameters, improved dynamic aperture, and spin-rotators in the Low Energy Ring for longitudinal polarization of the electron beam at the Interaction Point. Optimized for best colliding-beam performance, the facility may also provide high-brightness photon beams for synchrotron-radiation applications. 		 
slides icon Slides TUOAN1 [9.378 MB]  
 
THP069 Vibration Budget for SuperB 2261
 
  • K.J. Bertsche, W. Wittmer
    SLAC, Menlo Park, California, USA
  • B. Bolzon, L. Brunetti, A. Jeremie
    IN2P3-LAPP, Annecy-le-Vieux, France
  • S. Tomassini
    INFN/LNF, Frascati (Roma), Italy
  
  Funding: Work supported by the Department of Energy under contract number DE-AC03-76SF00515.
We present a vibration budget for the SuperB accelerator. This includes ground motion data, motion sensitivity of machine components, and beam feedback system requirements. 		 
 
THP071 Interaction Region Design of Super-CT-Factory in Novosibirsk 2264
 
  • A.V. Bogomyagkov, E.B. Levichev, P.A. Piminov
    BINP SB RAS, Novosibirsk, Russia
  
  The interaction region of the Super-CT-factory is designed to bring stored electron-positron beams into collision with luminosity of 1035 cm-2sec-1. To achieve this a waist collision scheme is implemented, which requires cross-angle collision with high Piwinski angle. The small values of the beta functions at the interaction point and distant final focus lenses are the reasons for high nonlinear chromaticity limiting energy acceptance of the whole ring. The present design allows correction of linear and nonlinear chromaticity of beta functions and of betatron tune advances, correction of second and third order geometrical aberrations from the strong sextupoles pairs, satisfies geometrical constraints, embraces realistic design of final focus quadrupoles and as close as possible positioning of crab sextupole to interaction point.  
 
THP072 Compensation of Detector Solenoid in SUPER-B 2267
 
  • Y. Nosochkov, K.J. Bertsche, M.K. Sullivan
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the Department of Energy Contract DE-AC02-76SF00515.
The SUPER-B detector solenoid has a strong 1.5 T field in the Interaction Region (IR) area, and its tails extend over the range of several meters. The main effect of the solenoid field is the coupling of the horizontal and vertical betatron motion which needs to be corrected in order to preserve the small design beam size at the Interaction Point. The additional complications are that: a) due to the crossing angle the solenoid is not parallel to either of the two beams, thus leading to orbit and dispersion perturbations; b) the solenoid overlaps the innermost IR permanent quadrupoles, which will cause additional coupling effects. The proposed correction system provides local compensation of the solenoid effects independently for each side of the IR. It includes “bucking” solenoids to remove the unwanted long solenoid field tails and a set of skew quadrupoles, dipole correctors and anti-solenoids to cancel all linear perturbations to the optics. The details of the correction system design are presented.