Discussion of Inconsistent Simulation Results in Top-up Injection

Thursday 7 Aug 2025, 10:00 → 11:00 Europe/Zurich

10:00 → 10:20 Inconsistent Simulation Results

Objectives: Reach coherent results before the presentation at FCC optics meeting

Top-up injection with only considering SR

• Similar results between SAD and Xsuite (ABT), but evident different Xsuite simulation results between ABP (Xutil) and ABT
  
  
  • Horizontal emittance blow-up is observed in both SAD and Xsuite (ABT), but not in Xsuite (ABP)
  • Vertical emittance results looks fine
  • Longitudinal emittance difference?
• Injection efficiency results
  • 100 % with only considering the SR
  • slightly difference with considering the WS beambeam effects

 

Possible difference

 

• Code tracking difference?
  • Tracking setting
  • Lattice generation methods (the version of July)

 

• Beam Parameter 
  • According to the booster repo, the bunch length of injected beam should be 2.4 mm ?
• Beam distribution difference
• Comparison between Sen and Xutil (Matched beam)
• 
• Comparison between Sen and SAD (Mismatched beam)
• 
• Emittance results comparison
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