Beam-Beam Meeting 7

Tuesday 14 Apr 2026, 10:00 → 11:05 US/Pacific

10:00 → 11:00 Discussion

• WarpX / Xsuite tutorials
• SuperKEKB
• multi-turn

• US-HFCC meeting at SLAC in September: https://indico.slac.stanford.edu/event/10213/overview 
• US-HFCC tutorials: Peter and Arianna will meet to discuss  
• FCC Week: Peter, Jan, Dimitris, Spencer will submit abstracts
• Poisson solver: Katie, Jan, Arianna will meet separately 
• To do: reproduce figure 13 from this paper https://doi.org/10.1103/PhysRevAccelBeams.26.111002 - 2D histogram polar angle vs. transverse momentum of incoherent pairs 
• Particle hand-off from to detector simulations
  • stop them at beam pipe
  • in Guinea-Pig there is a flag to stop the pairs 
  • in WarpX we can do it either with specific diagnostics or by setting the beam pipe as the boundary 
  • include also B field = 2 T field (must be align correctly!) 
  • time at which beam pipe: not sure if it matters 
• Multi-turn:
  • workflow WarpX+Xsuite to be optimized
  • 100k particles, 200 turns, Xsuite does linear map = 8 hours on 1 GPU on S3DF 
  • will have to include
    • top-up injection of new beam particles (~once a minute, ~1/4 of turn later they reach the detector) 
    • reflection of synchrotron photons at beam pipe (exists in BDSIM)
• Sensitivity studies of BB sims wrt beam parameters