FCC-ee top-up injection
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FCC-ee top-up injection
Present: Y. Dutheil, G. Gonen, M.A. Jebramcik, T. Mori, G. Nigrelli, K. Skoufaris, S. Yue
New colleagues:
- Marc-André (ABP): Linear/non-linear optics, working on LCC w/ Pantaleo
- Gal (ABT): Tracking studies on MIK injection scheme
Top-Up Injection Status gitlab link
- Repository updates
- Loss locations (S7): Discrepancies between SAD and Xsuite, Takashi will update the loss output to show meters instead of element ID
- Beam matching issues at injection likely linked to beam-beam element.
- S8 simulations without beam-beam still show injection inefficiency.
- Simulation comparison:
- with beam-beam SAD: ~80% efficiency. Xsuite: ~66% efficiency.
- Large discrepancy on beam-beam impact
- much larger than results showed at FCCweek
- Potential source:
- mismatch in injected beam parameters.
- injected beam in Xsuite uses the SAD distribution
- Giulia and Kyriacos + several others working on a tool set that will ensure setup and reproducibility of results
- Marc-Andre recommends to check the beam-beam force effect on the lattice w/o SR and using FFT on the tracking
Nonlinear Kickers and Injection Schemes
- Review presented at low emittance workshop 2024 here by P. Alexandre (ESRF)
- Present work in ABT aim at establishing specifications for a MIK
- for FCC
- Initial work by P. Hunchak, for instance here
- no bump of circulating beam
- Marc-André matching universal straight from GHC section to LCC. -> LCC will be available soon as drop-in replacement for the purpose of injection tracking
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- Non-linear kickers have been installed (Max IV, SOLEIL, SIRIUS) or are being developed (ESRF-EBS, SOLEIL2) at several facilities
- Review presented at low emittance workshop 2024 here by P. Alexandre (ESRF)
- for FCC
- Initial work by P. Hunchak, for instance here
- no bump of circulating beam
- possibly simpler, thicker injection septum
- but needs compensation (second non-linear kicker to compensate the non-linearity for the circulating beam) -> strong optics constraint on phase advance and dispersion
- Status
- specifications are being discussed
- New summer student starting work of injection with MIK
- Prospects
- Need to study the impact of compensation error -> beyond the lattice choice
- GHC lattice does not provide the required optics quantities -> can we use a fake-cMIK at the injection point for now, perfect compensation
- possibly new distribution of the injection losses will require updated
- LCC lattice : no work as yet, but needs to be started within the next few weeks
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