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interaction-region

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MOPP031 Challenges and Concepts for Design of an Interaction Region with Push-pull Arrangement of Detectors - an Interface Document shielding, alignment, radiation, collider 616
 
  • A. Seryi, T. W. Markiewicz, M. Oriunno, M. K. Sullivan
    SLAC, Menlo Park, California
  • D. Angal-Kalinin
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • B. Ashmanskas, V. R. Kuchler, N. V. Mokhov
    Fermilab, Batavia, Illinois
  • K. Buesser
    DESY, Hamburg
  • P. Burrows
    OXFORDphysics, Oxford, Oxon
  • A. Enomoto, Y. Sugimoto, T. Tauchi, K. Tsuchiya
    KEK, Ibaraki
  • A. Herve, J. A. Osborne
    CERN, Geneva
  • A. A. Mikhailichenko
    Cornell University, Department of Physics, Ithaca, New York
  • B. Parker
    BNL, Upton, Long Island, New York
  • T. Sanuki
    Tohoku University, School of Scinece, Sendai
  • J. Weisend
    NSF, Arlington
  • H. Y. Yamamoto
    Tohoku University, Sendai
  Two experimental detectors working in a push-pull mode has been considered for the Interaction Region of the International Linear Collider [1]. The push-pull mode of operation sets specific requirements and challenges for many systems of detector and machine, in particular for the IR magnets, for the cryogenics system, for alignment system, for beamline shielding, for detector design and overall integration, and so on. These challenges and the identified conceptual solutions discussed in the paper intend to form a draft of the Interface Document which will be developed further in the nearest future. The authors of the present paper include the organizers and conveners of working groups of the workshop on engineering design of interaction region IRENG07 [2], the leaders of the IR Integration within Global Design Effort Beam Delivery System, and the representatives from each detector concept submitting the Letters Of Intent.  
 
TUPC065 Luminosity Measurement at DAΦNE for Crab Waist Scheme luminosity, background, simulation, controls 1203
 
  • M. Boscolo, F. Bossi, B. Buonomo, G. Mazzitelli, F. Murtas, P. Raimondi, G. Sensolini
    INFN/LNF, Frascati (Roma)
  • N. Arnaud, D. Breton, A. Stocchi, V. Variola, B. F. Viaud
    LAL, Orsay
  • P. Branchini
    roma3, Rome
  • F. Iacoangeli, P. Valente
    INFN-Roma, Roma
  • M. Schioppa
    INFN Gruppo di Cosenza, Arcavacata di Rende (Cosenza)
  Since the beginning of 2008 the DAΦNE complex started to test the "crabbed scheme" to improve the luminosity performance of the accelerator. In order to ensure a fast, accurate and absolute measurement of the luminosity and to fully understand the background conditions, the new interaction region has been equipped with three different luminosity monitors: a Bhabha calorimeter, a Bhabha GEM tracker and a gamma bremsstrahlung proportional counter. The detectors design, construction, and performance, as well as the first measurements performed at DAΦNE during the crab waist commissioning are here presented. Data are also compared with the Monte Carlo simulations of the full setup. First results acquired during the SIDDHARTA run are supposed to be presented.  
 
WEXG02 Crabbed Waist Collisions in DAΦNE and Super-B Design luminosity, collider, injection, emittance 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.  
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WEPD027 A new cable insulation scheme improving heat transfer in Nb-Ti superconducting accelerator magnets superconducting-magnet, dipole, quadrupole, collider 2467
 
  • D. Tommasini, D. Richter
    CERN, Geneva
  The next applications of superconducting magnets for interaction regions of particle colliders or for fast cycled accelerators require dealing with large heat fluxes generated or deposited in the coils. Last year* we have anticipated the theoretical potential for a large improvement of heat transfer of state of the art Nb-Ti cable insulations in superfluid helium, such as the one used for the LHC superconducting magnets. In this paper we present and discuss new experimental results, confirming that a factor of 5 increase of the allowed heat flux from coil to coolant can be obtained with the new insulation topology while keeping a sound margin in the dielectric performance.

*M. La China, D. Tommasini. “Cable Insulation Scheme to Improve Heat Transfer to Superfluid Helium in Nb-Ti Accelerator Magnets,” MT-20, Philadelphia, USA, August 2007.

 
 
WEPP032 Parametric Study of Energy Deposition in the LHC Inner Triplet for the Phase 1 Upgrade quadrupole, dipole, insertion, luminosity 2590
 
  • E. Y. Wildner, F. Borgnolutti, F. Cerutti, M. Mauri, A. Mereghetti, E. Todesco
    CERN, Geneva
  To be able to make a global parametric analysis and to have some basic understanding of the influence of critical parameters, scaling laws may be of help. For the design of the LHC collision insertion regions, one of the critical parameters is the energy deposited in the insertion superconducting magnet coils, to avoid magnet quench, too heavy load on the cryogenic system, and degradation of the superconductor due to radiation. The influence on energy deposition of some key parameters for magnet design, such as the magnet apertures, the magnet lengths and positions, has been studied for some specified optical beta-value at the collision point.  
 
WEPP039 Design of a 1036 cm-2 s-1 Super-B Factory collider, luminosity, injection, emittance 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.  
 
WEPP042 An Improved Design for a SuperB Interaction Region quadrupole, emittance, luminosity, background 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.  
 
WEPP046 Final Focus for the Crab-waist Tau-charm Factory quadrupole, luminosity, factory, collider 2623
 
  • I. N. Okunev
    BINP, Novosibirsk
  • A. Bogomyagkov, E. B. Levichev, P. A. Piminov, S. V. Sinyatkin, P. Vobly
    BINP SB RAS, Novosibirsk
  In the crab-waist colliders design of the final focus region is a matter of primary importance. The paper describes analysis of final focus quadrupole design and results of particles tracking through the quadrupoles.