Author: Sullivan, M.K.
Paper Title Page
WEXBA01 IR Design for High Luminosity and Low Backgrounds 194
 
  • M.K. Sullivan
    SLAC, Menlo Park, California, USA
  
  Funding: Work supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-76SF00515 and HEP
New e+e− accelerator designs aim for factory-like performance with high-current beams and high luminosities. These new machines will push interaction region designs to new levels and require a careful evaluation of all previous background sources as well as introduce possibly new background sources. I present here a summary of standard background sources and also suggest a new possible background source for Synchrotron Radiation (SR) namely, specular reflection. In addition, one will have to pay closer attention to the beam tail particle distribution as this may become a significant source of SR background from the high-current and high-energy beams of these new designs. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA01  
About • paper received ※ 16 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEXBA02 Machine Detector Interface for the e+e− Future Circular Collider 201
 
  • M. Boscolo, O.R. Blanco-García
    INFN/LNF, Frascati (Roma), Italy
  • N. Bacchetta
    INFN- Sez. di Padova, Padova, Italy
  • E. Belli
    INFN-Roma, Roma, Italy
  • M. Benedikt, H. Burkhardt, D. El Khechen, K. Elsener, M. Gil Costa, P. Janot, R. Kersevan, A.M. Kolano, E. Leogrande, M. Lueckof, E. Perez, N.A. Tehrani, H.H.J. Ten Kate, O. Viazlo, G.G. Voutsinas, F. Zimmermann
    CERN, Meyrin, Switzerland
  • A.P. Blondel, M. Koratzinos
    DPNC, Genève, Switzerland
  • A.V. Bogomyagkov, E.B. Levichev, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  • F. Collamati
    INFN-Roma1, Rome, Italy
  • M. Dam
    NBI, København, Denmark
  • A. Novokhatski, M.K. Sullivan
    SLAC, Menlo Park, California, USA
  • K. Oide
    KEK, Ibaraki, Japan
  
  The international Future Circular Collider (FCC) study~[fccweb] aims at a design of p-p, \rm e+e-, e-p colliders to be built in a new 100~km tunnel in the Geneva region. The \rm e+e- collider (FCC-ee) has a centre of mass energy range between 90 (Z-pole) and 375~GeV (t\bar{t}). To reach such unprecedented energies and luminosities, the design of the interaction region is crucial. The crab-waist collision scheme~[ref:cw] has been chosen for the design and it will be compatible with all beam energies. In this paper we will describe the machine detector interface layout including the solenoid compensation scheme. We will describe how this layout fulfills all the requirements set by the parameters table and by the physical constraints. We will summarize the studies of the impact of the synchrotron radiation, the analysis of trapped modes and of the backgrounds induced by single beam and luminosity effects giving an estimate of the losses in the interaction region and in the detector.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA02  
About • paper received ※ 03 November 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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WEXBA04 Early Commissioning of the Luminosity Dither System for SuperKEKB 212
 
  • Y. Funakoshi, T. Kawamoto, M. Masuzawa, S. Nakamura, T. Oki, M. Tobiyama, S. Uehara, R. Ueki
    KEK, Ibaraki, Japan
  • P. Bambade, S. Di Carlo, D. Jehanno, C.G. Pang
    LAL, Orsay, France
  • D.G. Brown, A.S. Fisher, M.K. Sullivan
    SLAC, Menlo Park, California, USA
  • D. El Khechen
    CERN, Geneva, Switzerland
  • U. Wienands
    ANL, Argonne, Illinois, USA
  
  SuperKEKB is an electron-positron double ring collider at KEK which aims at a peak luminosity of 8 x 1035 cm-2s-1 by using what is known as the ’nano-beam’ scheme. A luminosity dither system is employed for collision orbit feedback in the horizontal plane. This paper reports a system layout of the dither system and algorithm tests during the SuperKEKB Phase 2 commissioning.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-WEXBA04  
About • paper received ※ 15 October 2018       paper accepted ※ 19 February 2019       issue date ※ 21 April 2019  
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