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FCC-ee top-up injection
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FCC-ee top-up injection
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
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