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    FCC-ee top-up injection

    → Europe/Zurich
    FCC-ee top-up injection
    Zoom Meeting ID
    66156014911
    Host
    Yann Dutheil
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    Present: C. Carli, Y. Dutheil, A. Lechner, T. Mori, G. Nigrelli, K. Skoufaris, S. Yue

    • Follow-up from the optics meeting

      • Longitudinal offset that gave high injection efficiency still not understood.
      • Xsuite–SAD comparison:
        • Takashi adjusted max threshold (3 m → 1 m).
        • Applying the same emittance method.
        • Results remain to be checked.
      • Giulia continuing simulations incl. collimation; may report next meeting.

    • Optics comparison

      • Optics files to be shared soon.
      • Impact of using a new optics in PB to be discussed.
      • Next steps: tracking without beam–beam (ABT needs ~1 month once lattices are provided; ~3 months if hardware changes).
      • Beam–beam tracking will not be used for injection-efficiency comparison.

    • Top-up injection tracking (Sen)

      • Large βx change with ΔE/E = 0.95% (GHC).
      • Adding the non-linear location (with linear Twiss) lowers injection efficiency — unexpected.
      •  -> tracking could be repeated with different seeds to check convergence
      • Vertical emittance blow-up not solved with Twiss parameter scan; remains to be understood. 
      • -> the vertical emittance calculation needs to be checked
      • Preliminary LCC study: with present β and D requires injection offset of 1.12%
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