Author: Gottschalk, S.C.
Paper Title Page
THPAL078 In-Vacuum Lambertson Septum for SPEAR3 Low Emittance Injection 3831
  • M.A.G. Johansson, J. Langton, J.A. Safranek
    SLAC, Menlo Park, California, USA
  • S.C. Gottschalk
    STI Magnetics LLC, Woodinville, USA
  Funding: Work supported by DOE Contract No. DE-AC02-76SF00515
A new in-vacuum Lambertson septum magnet is being designed for the SPEAR3 storage ring, intended to replace the existing septum to allow injection into a new lower emittance operation mode for SPEAR3. The new septum design is constrained to fit in the same length and have the same bend angle as the existing injection septum, so as to minimize changes to surrounding storage ring and transfer line components, while also meeting stringent requirements on the stored beam leakage field. This has led to a design using Vanadium Permendur alloy for the septum pole pieces, with shaping of the inner profile of the stored beam channel to minimize the leakage fields indicated in 2D and 3D magnetic simulations.
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