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Bettoni, S.

Paper Title Page
MOPP010 Experimental Studies on Drive Beam Generation in CTF3 571
 
  • R. Corsini, S. Bettoni, S. Doebert, P. K. Skowronski, F. Tecker
    CERN, Geneva
  • C. Biscari, A. Ghigo
    INFN/LNF, Frascati (Roma)
  • Y.-C. Chao
    Jefferson Lab, Newport News, Virginia
 
  The objective of the CLIC Test Facility CTF3, built at CERN by an international collaboration, is to demonstrate the main feasibility issues of the CLIC two-beam technology by 2010. CTF3 consists of a 150 MeV electron linac followed by a 42 m long delay loop, an 84 m combiner ring and a two-beam test area. One key-issue studied in CTF3 is the efficient generation of a very high current drive beam, used in CLIC as the power source for the acceleration of the main beam to multi-TeV energies. The beam current is first doubled in the delay loop and then multiplied again by a factor four in the combiner ring by interleaving bunches using transverse deflecting RF cavities. The combiner ring and the connecting transfer line have been installed and put into operation in 2007. In this paper we give the status of the commissioning, illustrate the beam optics measurements, discuss the main issues and present the results of the combination tests.  
WEXG02 Crabbed Waist Collisions in DAΦNE and Super-B Design 1898
 
  • P. Raimondi, D. Alesini, M. E. Biagini, C. Biscari, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, C. Milardi, F. Murtas, L. Pellegrino, M. A. Preger, L. Quintieri, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov
    INFN/LNF, Frascati (Roma)
  • N. Arnaud, D. Breton, P. Roudeau, A. Stocchi, V. Variola, B. F. Viaud
    LAL, Orsay
  • S. Bettoni
    CERN, Geneva
  • P. Branchini
    roma3, Rome
  • M. Esposito
    Rome University La Sapienza, Roma
  • I. Koop, E. B. Levichev, P. A. Piminov, D. N. Shatilov, V. V. Smaluk
    BINP SB RAS, Novosibirsk
  • K. Ohmi
    KEK, Ibaraki
  • E. Paoloni
    University of Pisa and INFN, Pisa
  • M. Schioppa
    INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza)
  • D. Teytelman
    SLAC, Menlo Park, California
  • P. Valente
    INFN-Roma, Roma
 
  The new idea of increasing the luminosity of a collider with crabbed waist collisions and first experimental results from DAΦNE using this concept are presented. Consequences for the design of future factories will be discussed. An outlook to the performance reach with crabbed waist collisions is given, with emphasis on future B Factories.  
slides icon Slides  
WEPD002 Magnetic Design Studies for the Final Focus Quadrupoles of the SuperB Large Crossing Angle Collision Scheme 2401
 
  • E. Paoloni
    University of Pisa and INFN, Pisa
  • S. Bettoni
    CERN, Geneva
  • M. E. Biagini, P. Raimondi
    INFN/LNF, Frascati (Roma)
 
  The vertical focusing element closest to the interaction point of the SuperB factory based on the large crossing angle collision scheme (~50 mrad), must provide a pure quadrupolar field on each of the two beams. This allows to avoid the high background rate in the detector which would be produced by the over-bend of the off-energy particles if a dipolar component were present. Because of the small separation of the two beams in the transverse dimension (only 2 cm) the influence of each winding on the other one is not negligible and, for the same space limitation, a multi-layer configuration is not suitable to compensate the high order multipoles. A novel design, based on 'helical-type' windings, has therefore been investigated. The windings generates the pure quadrupolar field as a superposition of the inner field of the surrounding coil and of the outer fringe field of the neighbor one. The same idea may be used to produce two pure quadrupolar fields with opposite strength, suitable for the final focus elements in colliders, as LHC, where the sign of the circulating particles are the same. In this paper the 2D concept and the 3D model of this design are presented.  
WEPP036 DAΦNE Setup and Operation with the Crab-Waist Collision Scheme 2599
 
  • C. Milardi, D. Alesini, M. E. Biagini, C. Biscari, R. Boni, M. Boscolo, F. Bossi, B. Buonomo, A. Clozza, G. O. Delle Monache, T. Demma, E. Di Pasquale, G. Di Pirro, A. Drago, A. Gallo, A. Ghigo, S. Guiducci, C. Ligi, F. Marcellini, G. Mazzitelli, F. Murtas, L. Pellegrino, M. A. Preger, L. Quintieri, P. Raimondi, R. Ricci, U. Rotundo, C. Sanelli, M. Serio, F. Sgamma, B. Spataro, A. Stecchi, A. Stella, S. Tomassini, C. Vaccarezza, M. Zobov
    INFN/LNF, Frascati (Roma)
  • N. Arnaud, D. Breton, P. Roudeau, A. Stocchi, V. Variola, B. F. Viaud
    LAL, Orsay
  • S. Bettoni
    CERN, Geneva
  • P. Branchini
    roma3, Rome
  • M. Esposito
    Rome University La Sapienza, Roma
  • I. Koop, E. B. Levichev, P. A. Piminov, D. N. Shatilov
    BINP SB RAS, Novosibirsk
  • K. Ohmi
    KEK, Ibaraki
  • E. Paoloni
    University of Pisa and INFN, Pisa
  • M. Schioppa
    INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza)
  • V. V. Smaluk
    BINP, Novosibirsk
  • P. Valente
    INFN-Roma, Roma
 
  In the second half of 2007 a major upgrade has been implemented on the Frascati DAΦNE collider in order to test the novel idea of Crab Waist collisions. New vacuum chambers and permanent quadrupole magnets have been designed, fabricated and installed to realize the new configuration. At the same time the performances of relevant hardware components, such as fast injection kickers and shielded bellows have been improved relying on new design concepts. The collider has been successfully commissioned in this new configuration. The paper describes the new layout as well as several experimental results about linear and non-linear optics setup and optimization, damping of beam instabilities and discusses the obtained luminosity performances.  
WEPP039 Design of a 1036 cm-2 s-1 Super-B Factory 2605
 
  • J. Seeman, K. J. Bertsche, A. Novokhatski, M. K. Sullivan, U. Wienands, W. Wittmer
    SLAC, Menlo Park, California
  • S. Bettoni
    CERN, Geneva
  • M. E. Biagini, R. Boni, M. Boscolo, T. Demma, A. Drago, S. Guiducci, P. Raimondi, S. Tomassini, M. Zobov
    INFN/LNF, Frascati (Roma)
  • A. Bogomyagkov, I. Koop, E. B. Levichev, S. A. Nikitin, P. A. Piminov, D. N. Shatilov
    BINP SB RAS, Novosibirsk
  • G. Marchiori
    INFN-Pisa, Pisa
  • E. Paoloni
    University of Pisa and INFN, Pisa
 
  Submitted for the High Luminosity Study Group for an Asymmetric Super-B-Factory: Parameters are being studied for a high luminosity e+e- collider operating at the Upsilon 4S that would deliver a luminosity of 1 to 2 x 1036/cm2/s. This collider would use a novel combination of linear collider and storage ring techniques. In this scheme an electron beam and a positron beam are stored in low-emittance damping rings similar to those designed for a Linear Collider (LC) or the next generation light source. A LC style interaction region is included in the ring to produce sub-millimeter vertical beta functions at the collision point. A large crossing angle (±25 mrad) is used at the collision point to allow beam separation. A crab-waist scheme is used to reduce the hourglass effect and restore peak luminosity. Beam currents of about 1.8 A in 1400 bunches can produce a luminosity of 1036/cm2/s with upgrade possibilities. Design parameters and beam dynamics effects are discussed.  
WEPP040 New Low Emittance Lattices for the SuperB Accelerator Project 2608
 
  • M. E. Biagini, M. Boscolo, P. Raimondi, S. Tomassini, M. Zobov
    INFN/LNF, Frascati (Roma)
  • S. Bettoni
    CERN, Geneva
  • A. Bogomyagkov, I. Koop, E. B. Levichev, S. A. Nikitin, P. A. Piminov, D. N. Shatilov
    BINP SB RAS, Novosibirsk
  • E. Paoloni
    University of Pisa and INFN, Pisa
  • J. Seeman, M. K. Sullivan, U. Wienands, W. Wittmer
    SLAC, Menlo Park, California
 
  New low emittance lattices (1.6 nm at 7 GeV, 2.8 nm at 4 GeV) have been designed for the asymmetric SuperB accelerator aiming at a luminosity of 1036 cm-2 s-1. Main optics features are two alternating arc cells with different horizontal phase advance, in order to decrease beam emittance and allow at the same time for easy chromaticity correction in the arcs. Emittance can be further reduced by a factor of two for luminosity upgrade. New beam parameters have been chosen to fulfill the transparency conditions for 4x7 GeV beams, different from the asymmetric currents used in operating B-Factories. Beam polarization schemes have been studied and will be implemented in the lattice.  
WEPP042 An Improved Design for a SuperB Interaction Region 2614
 
  • M. K. Sullivan, J. Seeman, U. Wienands
    SLAC, Menlo Park, California
  • S. Bettoni
    CERN, Geneva
  • M. E. Biagini, P. Raimondi
    INFN/LNF, Frascati (Roma)
  • E. Paoloni
    University of Pisa and INFN, Pisa
 
  We present an improved design for a SuperB interaction region. The new design attempts to minimize the bending of the two colliding beams which results from shared magnetic elements near the Interaction Point (IP). The total crossing angle at the IP is increased from 34 mrad to 50 mrad and the distance from the IP to the first quadrupole is increased. Although the two beams still travel through this shared magnet, these changes allow for a new a new magnetic field design with a septum which gives the magnet two magnetic centers. This greatly reduces the beam bending from this shared quadrupole and thereby reduces the radiative bhabha background for the detector as well as any beam emittance growth from the bending. We decribe the new design for the interaction region.