General Meeting Minutes 2/12/10

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Contents

Participants

A. Accardi, A. Bogacz, J.P. Chen, S. Derbenev, H. Gao, V. Guzey, R. Ent, T. Horn, N. Kalantarians, V. Kubarovsky P. Nadel-Turonski, A. Prokudin, H. Sayed, C. Weiss, Y. Zhang

Ion Lattice

  • 'Relaxed IR design', triplet based optics
  • The ion collider ring is based on a 60deg. FODO lattice
    • Compact figure-8 ring layout (660 m circumference)
    • Quad strength lowered to about 100 T/m
  • Uses a novel chromaticity compensation scheme - large chromaticity of the IRs
    • Uncompensated dispersion from arc
    • Dispersive straights with dedicated high symmetry optics inserts, pairs of sextupoles "minus identity" apart
    • 60 deg. lattice, uniform pattern for three families of orthogonal sextupoles, cancellation of spherical aberrations
  • We now have an ion lattice in addition to the electron lattice that we can study
  • Reference slides (Alex Bogazc: Ion Collider Ring with 'Relaxed' IR Optics)

Ion Quads

  • As a follow-up to the discussion on the IR proton optics, the possibility of using a large-aperture final-focusing quad at closer distance was mentioned. Since the focal length gets shorter as the quad moves closer to the IP, the required gradient scales inversely with distance. At 5 m, for instance, it would thus be more than 150 T/m for the first ion FF quad. To achieve an aperture of 100 mrad at the upstream side of the quad (the downstream one would be smaller), would require an inner bore radius of 0.5 m, giving a peak field of 75 T, which is an order of magnitude larger than can be achieved. Thus, large aperture quads are not an option for the ion optics.


Discussion of MEIC parameters

  • Rolf presents the MEIC parameter list sent to the User Workshop conveners by the director
  • The main questions to be considered during the workshops are:
  1. What nuclear science within your topic of interest can quantitatively be accomplished with the foreseen parameters?
  2. What nuclear science within your topic of interest could quantitatively be accomplished with a change in the parameter space given, e.g., by a change in the energies, a change in the luminosity, a change in the detector space.


Summary of workshop at FIU

  • Vadim gives an overview and impressions of the workshop on High Energy Nuclear Physics and QCD held at FIU on Feb 3-6 2010
  • Reference slides (Vadim Guzey: Impressions of the FIU workshop)