Author: Cai, Y.
Paper Title Page
TUOBB02 FACET-II Accelerator Research with Beams of Extreme Intensities 1067
  • V. Yakimenko, Y. Cai, C.I. Clarke, S.Z. Green, C. Hast, M.J. Hogan, N. Lipkowitz, N. Phinney, G.R. White, G. Yocky
    SLAC, Menlo Park, California, USA
  In 2016, the second phase of SLAC's x-ray laser, the LCLS-II, will begin to use part of the tunnel occupied by FACET, and the world's only multi-GeV facility for advanced accelerator research will cease operation. FACET-II is a new test facility to provide DOE with the unique capability to develop advanced acceleration and coherent radiation techniques with high-energy electron and positron beams. FACET-II is an opportunity to build on the decades-long experience developed conducting advanced accelerator R&D at the FFTB and FACET and re-deploy HEP infrastructure in continued service of its mission. FACET-II provides a major upgrade over current FACET capabilities and the breadth of the potential research program makes it truly unique. It will synergistically pursue accelerator science that is vital to the future of both advanced acceleration techniques for High Energy Physics, ultra-high brightness beams for Basic Energy Science, and novel radiation sources for a wide variety of applications. The presentation will discuss FACET-II project status and plans for diverse experimental program.  
slides icon Slides TUOBB02 [17.664 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUOBB02  
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TUPMB021 SLAC FACET-II Positron Damping Ring Magnet Design 1154
  • M.A.G. Johansson
    MAX IV Laboratory, Lund University, Lund, Sweden
  • Y. Cai, V. Yakimenko
    SLAC, Menlo Park, California, USA
  The FACET-II facility, currently being designed at SLAC, will contain a small ~20 m circumference, 335 MeV, positron damping ring. The ring has to fit in the existing linac tunnel, meaning that a compact lattice with short distances between magnets is required. The detailed magnet design is done in Opera-3d, with a finite element model of a full damping ring arc being simulated. This article presents this magnet design in a relatively early stage, with iteration between magnet and lattice design currently in progress.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMB021  
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WEPMW012 Injection Optics for the JLEIC Ion Collider Ring 2445
  • V.S. Morozov, Y.S. Derbenev, F. Lin, F.C. Pilat, G.H. Wei, Y. Zhang
    JLab, Newport News, Virginia, USA
  • Y. Cai, Y. Nosochkov, M.K. Sullivan, M.-H. Wang
    SLAC, Menlo Park, California, USA
  Funding: * Work supported by the U.S. DOE Contract DE-AC02-76SF00515. ** Authored by Jefferson Science Associates, LLC under U.S. DOE Contracts No. DE-AC05-06OR23177 and DE-AC02-06CH11357.
The Jefferson Lab Electron-Ion Collider (JLEIC) will accelerate protons and ions from 8 GeV to 100 GeV. A very low beta function at the Interaction Point (IP) is needed to achieve the required luminosity. One consequence of the low beta optics is that the beta function in the final focusing (FF) quadrupoles is extremely high. This leads to a large beam size in these magnets as well as strong sensitivity to errors which limits the dynamic aperture. These effects are stronger at injection energy where the beam size is maximum, and therefore very large aperture FF magnets are required to allow a large dynamic aperture. A standard solution is a relaxed injection optics with IP beta function large enough to provide a reasonable FF aperture. This also reduces the effects of FF errors resulting in a larger dynamic aperture at injection. We describe the ion ring injection optics design as well as a beta-squeeze transition from the injection to collision optics.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMW012  
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THPOR011 Design study of CEPC Alternating Magnetic Field Booster 3791
  • T.J. Bian, S. Bai, X. Cui, J. Gao, D. Wang, Y. Wang, M. Xiao, C. Zhang
    IHEP, Beijing, People's Republic of China
  • Y. Cai
    SLAC, Menlo Park, California, USA
  • M. Koratzinos
    DPNC, Genève, Switzerland
  • F. Su
    Institute of High Energy Physics (IHEP), People's Republic of China
  CEPC is next generation circular collider proposed by China. The design of the full energy booster ring of the CEPC is especially challenging. The ejected beam energy is 120GeV but the injected beam only 6GeV. In a conventional approach, the low magnetic field of the main dipole magnets creates problems. We propose to operate the booster ring as a large wiggler at low beam energies and as a normal ring at high energies to avoid the problem of very low dipole magnet fields.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR011  
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THPOR022 Design of Beam Optics for the FCC-ee Collider Ring 3821
  • K. Oide, K. Ohmi, D. Zhou
    KEK, Ibaraki, Japan
  • M. Aiba
    PSI, Villigen PSI, Switzerland
  • S. Aumon, M. Benedikt, H. Burkhardt, A. Doblhammer, B. Härer, B.J. Holzer, J.M. Jowett, M. Koratzinos, L.E. Medina Medrano, Y. Papaphilippou, J. Wenninger, F. Zimmermann
    CERN, Geneva, Switzerland
  • A.P. Blondel
    DPNC, Genève, Switzerland
  • A.V. Bogomyagkov, I. Koop, E.B. Levichev, P.A. Piminov, D.N. Shatilov, D.B. Shwartz, S.V. Sinyatkin
    BINP SB RAS, Novosibirsk, Russia
  • M. Boscolo
    INFN/LNF, Frascati (Roma), Italy
  • Y. Cai, M.K. Sullivan, U. Wienands
    SLAC, Menlo Park, California, USA
  A design of beam optics will be presented for the FCC-ee double-ring collider. The main characteristics are 45 to 175 GeV beam energy, 100 km circumference with two IPs/ring, 30 mrad crossing angle at the IP, crab-waist scheme with local chromaticity correction system, and "tapering" of the magnets along with the local beam energy. An asymmetric layout near the interaction region suppresses the critical energy of synchrotron radiation toward the detector at the IP less than 100 keV, while keeping the geometry as close as to the FCC-hh beam line. A sufficient transverse/longitudinal dynamic aperture is obtained to assure the lifetime with beamstrahlung and top-up injection. The synchrotron radiation in all magnets, the IP solenoid and its compensation, nonlinearity of the final quadrupoles are taken into account.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPOR022  
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