Design and Integration meeting: 30 March 2026 10:00 BST

Zoom: ​https://us06web.zoom.us/j/9842827712?pwd=Q1Nzd0RaVkc3SEtpaGJzaWZxSTh3QT09

Agenda

• Simulations (including ion discussion with Nick Dover)
• IPAC paper
• Collaboration meeting agenda.
• AOB

Notes

Present: WS HO MMC CW JP TJK ND
Absent: KL MP

• Simulations
  • Discussion with ND on carbon ion beams:
    • Little data available in literature. TNSA not effective for ions. One paper has studied but at low energy.
    • Simulation work needed with PIC codes, lack of personnel to undertake.
    • similar spectral shape expected in theory possible to adapt Lara linear optics. Scale Q/M ratio. Conversion efficiency around 3 to 6%.
    • Could expect 10⁸ ions up to a maximum ~ 10 MeV/u.
  • Discussion with ND on electron distribution:
    • no one measured electron distribution. Evidence suggests complete space charge cancellation, ie co-propagating electrons with same velocity distribution.
    • fast electrons (5 to 10 MeV) Will hit the nozzle causing it to charge and potentially deflect the lower ion beam. Timescale too short for charge to dissipate.
    • likely that the first electrons follow the laser angle rather than the proton beam.
    • Large angle assumption is valid similar to protons. Some will still enter the nozzle, order a few percent. Typically 30° incident angle, and 30° divergence.
    • Very relativistic, space charge unimportant.
  • MMC update: RF track matches the BDSIM model but not the emittance. Unsure why, still investigating. WS email KL regarding GPT access.

• Collaboration meeting agenda.
  • JP out 15th-29th April
• IPAC paper
  • Draft deadline agreed for Friday 1st May.
• AOB
  • None