D. Calzolari, C. Carli, Y. Dutheil, M. Jebramcik, J. Keintzel, T. Mori, G. Nigrelli, A. Potet, G. Roy, K. Skoufaris, S. Yue,

• Comparison report
• No feedback received yet, panel meeting next week
• Kyriacos will present several aspects, including to-up
• Kyriacos will circulate a few slides on top-up, possibly by the end of this week
• Daniele arrived in STI group, and working on FLUKA
• Plans for top-up in 2026 (Sen)
• W-mode with present optics remains an issue for on-axis -> needs hybrid or larger dispersion
• Will switch to 4-kicker orbit bump for the conventional scheme once the optics is chosen
• MIK scheme is more complex, but doesn't need a bump of the circulating beam
• Optics requirements discussed, with a focus when compensation and MIK are placed with zero phase advance, only the simplest concept is discussed for now
• Different mode have very different beam size -> requires different peak field location which may require different designs
• Question remain on the consequence of circulating beam halo kicked by the MIK
• Giulia discussed with COLL in view of setting up a simulation with main physics aspects to understand how the halo is simulated
• Complex simulation and resource-intensive
• COLL planning also comparison with KEK
• Present assumptions consider either
• halo population from beam lifetime -> leads to very heavily populated halo
• Linear distribution of the halo
• Question of the concept for compensation scheme, the feasibility remains in question but the zero phase advance concept may lift the challenging placement at pi or 2pi
• Last run at superKEKB (Takashi)
• Performed synchrotron injection, was successful until beta* of 3mm
• But at 1mm
• vertical dynamic apert was very small
• Part of the bunch was injected in the next bucket