TIDVG Particle Deposition
F.Velotti, C.Bracco, B.Goddard, M.Meddahi
Outline• Initial parameters–Particle distribution–Kicker waveforms
• Simulation for LHC beam• Simulation for HL-LHC beam• Conclusions and next steps
Initial parameters
• Optics: LHC Q20 -> Q_h = 20.13, Q_v = 20.18• Energy = 450 GeV• Dp/p = 0.29e-3• Number of bunches: 288• Bunch spacing: 25 ns• Tracking mode: MAD-X thin-tracking (thin-lens
approximation)• Area of each pixel = 0.25 mm2
LHC values• LHC Norm_emittance: 3.5 um (both planes)• p+/bunch = 1.15e11• Each macro particle = 1.15e8 p+
LHC values• HL- LHC Norm_emittance: 2.3 um (both planes)• p+/bunch = 2.3e11• Each macro particle = 2.3e8 p+
Particle Distribution• 1000 particles• Gaussian
distributions truncated at 3 𝜎
• Each bunch (288) composed of 1000 particles
• Bunch length supposed negligible
Kickers waveforms• MKDV synchronized at
6.975 us with the beam• Waveform sampled at
25 ns• Used the 5 different
current waveforms for the 5 MKDV/H obtained from the experts
• 41.4 kV (very pessimistic assumption)
Outline• Initial parameters–Particle distribution–Kicker waveforms
• Simulation for LHC beam• Simulation for HL-LHC beam• Conclusions and next steps
Simulation for LHC beamS=600.6076
Pixel_area=0.25 mm2
Simulation for HL-LHC beamS=600.6076 Pixel_area=
0.25 mm2
Outline• Initial parameters–Particle distribution–Kicker waveforms
• Simulation for LHC beam• Simulation for HL-LHC beam• Conclusions and next steps
Conclusions and next steps• Just preliminary study! • For LHC beam (1.15e11 p+/b), max particle
deposition is 3.31e11 p+/mm2
• For HL-LHC (2.3e11 p+/b), max particle deposition is 8.28e11 p+/mm2
• Use different HL-LHC values: • 2.5 um, 2.5p+/b• Pencil beam: 1.15 p+/b, 1 um
• Different MKDV voltage has to be considered for a more accurate analysis
• Studies of ‘common’ failure cases need still to done
Backup slides
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