Topical meeting on FCC-ee beam-dust interactions

Thursday 19 Jun 2025, 09:00 → 12:30 Europe/Zurich

774/1-079 (CERN)

Jan Uythoven (CERN), Anton Lechner (CERN), Christoph Wiesner (CERN), Roderik Bruce (CERN), Stefano Redaelli (CERN)

• Briefly summarize the present efforts to understand beam-dust interactions in hadron and lepton machines
• Get an overview of available tools/models/studies/experiments and identify the teams who are working (or plan to work in the future) on the different sub-topics:
  • Dust charging mechanisms in electron/positron storage rings (dependence on beam parameters, etc.)
  • Release of dust into the beam (dependence on dust material, dust size, pre-charge, etc.)
  • Particle-dust interaction (dust ionisation, resulting dust dynamics, dust trapping, dust heating, phase transition incl dependence on dust material, dust fission, etc.)
  • Effect on beam after a phase transition (due to released electrons or ions)
  • Local and global beam losses, including collimation
• Discuss the possible next steps for studying beam-dust interactions for FCC-ee, in view of the FCC pre-TDR in 2027
• Identify possible benchmark studies against existing measurements from LHC and SuperKEKB

Disclaimer: the scope of the meeting is not to give a detailed summary of results, but rather to develop a first work plan for FCC-ee beam-dust studies

09:00 → 09:05 Introduction

Speaker: Tor Raubenheimer (SLAC National Accelerator Laboratory - On Leave (US))

09:05 → 09:15 Scope and objectives of the meeting (5'+5')

Speaker: Jan Uythoven (CERN)

09:15 → 09:35 Topics and key questions (10'+10')

Speaker: Anton Lechner (CERN)

09:35 → 10:00 Modelling of dust charging and beam-dust interactions at CERN (15'+10')

Speaker: Christoph Wiesner (CERN)

10:00 → 10:25 Modelling of beam-dust interactions and effects on beam at KEK (15'+10')

Speaker: kazuhito ohmi (KEK)

10:25 → 10:50 Modelling of dust-induced beam instabilities at CERN (15'+10')

Speakers: Lotta Mether (CERN), Xavier Buffat (CERN)

10:50 → 11:10 Coffee break

11:10 → 11:30 Modelling of beam-plasma interactions at LBL? (10'+10')

11:30 → 11:55 Modelling of dust-induced beam losses at CERN (15'+10')

Speaker: Giulia Nigrelli (Sapienza Universita, INFN-LNF, CERN)

11:55 → 12:25 Guided discussion of study plans (30')