Keyword: dipole
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MOT3BH3 Issues in CEPC Pretzel and Partial Double Ring Scheme Design ion, sextupole, lattice, dynamic-aperture 39
 
  • H. Geng, J. Gao, Q. Qin, D. Wang, Y. Wang, Y. Zhang
    IHEP, Beijing, People's Republic of China
  • F. Su
    Institute of High Energy Physics (IHEP), People's Republic of China
  
  IHEP has proposed a circular electron and positron collider (CEPC) to study the properties of the Higgs boson. In the baseline design, the circumference of CEPC will be taken as 50-70km. The single ring scheme and the partial double ring scheme are now both under study. In the single ring scheme, the electron and positron beam will share the beam pipes, thus a special orbit is needed to avoid the beam colliding at positions except the Interaction Points (IPs). While in the partial double ring scheme, the two beams will be separated into two beam pipes in the parasitic collision positions. This paper will show the latest design of the CEPC lattice, including both the pretzel and partial double ring scheme. Some critical issues that we encountered when designing the lattices will be discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT3BH3  
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MOT4H7 Ideas for Siberian Snakes and Spin Rotators in Very High Energy e+e− Rings ion, polarization, solenoid, synchrotron 47
 
  • S.R. Mane
    Convergent Computing, Shoreham, New York, USA
  
  The high value of the radiated power in synchrotron radiation in very high energy e+e− storage rings presents unique challenges for the design of Siberian Snakes and spin rotators in such machines. This paper presents some ideas which may lead to a feasible design of such devices. The idea is to employ solenoids interleaved with the arc dipoles, to yield a set of noncommuting spin rotations, which can rotate an initially vertical spin to any desired direction. The solenoids should be (approximately) optically transparent, and can be 'spin matched' to the ring using known procedures. Preliminary numerical studies indicate the design may be feasible.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-MOT4H7  
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TUT2H3 Design study of CEPC Booster ion, dynamic-aperture, sextupole, wiggler 79
 
  • T.J. Bian, X. Cui, J. Gao, B. Sha, 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
  
  Funding: Work supported by National Natural Science Foundation of China, Grant No. NSFC 11575218 and No. 11505198
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 have two ways to solve this problem, Firstly, we propose to operate the booster ring as a large wiggler at low beam energy and as a normal ring at high energies to avoid the problem of very low dipole magnet fields. Secondly, we implement the orbit correction and correct the earth field to make booster work. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT2H3  
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