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FCC-ee optics tuning WG meeting
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FCC-ee optics tuning WG meeting
Zoom Meeting ID
65518046965
Host
Rogelio Tomas Garcia
Alternative host
Jacqueline Keintzel
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E. Musa presents updates on tuning simulations with SR with dipole and BPM misalignments. Without BPM misalignments a vertical emittance of 0.09 an 0.06 pm is found with and without CW. With BPMs misaligned and next to quadrupoles, 17 out of 20 seeds yield good DA. E. Musa presents on sensitivities to errors. She also finds that the Z-lattice is more sensitive, with some expections. J. Wenninger comments that the spread of the error sensitivity studies is large. L. van Riesen-Haupt suggests to remove large outliers. R. Tomas suggests to compare DA reduction when attaching BPMs to quadrupoles vs sextupoles, and simulations assuming girders. G. Roy suggests to also compare also RDTs, etc. K. Oide suggests to use the latest lattice version.
L. van Riesen-Haupt presents first DA with beam-beam and imperfections for ttbar optics V23. Radiation and tapering is included. Beamstrahlung is not included. DA is defined as the largest possible ellipse where all particles survived. DA decreases with larger multipoles. Beam-beam causes small fluctuations. Plots are given in arbitrary units. K. Oide comments that beamstrahlung should be included to reproduce collissions corrections. On lattices with IR perturbations (same misalignments at all IPs), and waist shifts, beam-beam does not seem to have a significant effect on the DA.
K. Oide presents on the detuned optics at Z, with 3 times larger beta_x* and 10 times larger beta_y* . MA is 2.5 times larger for the relaxed optics. CW is 0, but phase advance between sextupoles to IP is preserved.
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