Update on design of final TALs in the CLIC Drive Beam R. Apsimon, J. Esberg
Update on design of final TALs in the CLIC Drive Beam
Feb 24, 2016
Update on design of final TALs in the CLIC Drive Beam. R. Apsimon, J. Esberg. Optimisation techniques. Local optimisation Each cell optimised separately Easy to tune Poor energy acceptance Sextupoles don’t help a lot Global optimisation Match all sextupoles and quadrupoles - PowerPoint PPT Presentation
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Update on design of final TALs in the CLIC Drive Beam
R. Apsimon, J. Esberg
Optimisation techniques
• Local optimisation– Each cell optimised separately• Easy to tune• Poor energy acceptance
– Sextupoles don’t help a lot
• Global optimisation– Match all sextupoles and quadrupoles• Very good energy acceptance• Very weak sextupoles needed
• 20 sextupoles used– 4 sextupoles per arc cell– Maximum pole-tip field ~0.018 T
Locally optimised solution
Globally optimised solution
Dispersion energy dependence
R56 energy dependence
Emittance growth vs sextupole strength: PLACET tracking
Emittance growth vs sextupole strength: PLACET tracking
Emittance growth vs sextupole strength: PLACET tracking
Emittance growth vs sextupole strength: MADX-PTC tracking
HorizontalVertical
Longitudinal
PLACET tracking: longitudinal phase space: no synchrotron radiation
Emittance growth vs sextupole strength: PLACET tracking
HorizontalVertical
Longitudinal
PTC tracking emittance growth
Horizontal Vertical LongitudinalLocal optimisation 138 μm.Rad 2.2 μm.Rad 1.8 μm.GeV
Global optimisation 3.0 μm.Rad 2.0 μm.Rad -0.0012 μm.GeV
PLACET 0.67 s.f. 3.0 μm.Rad 0.85 μm.Rad 0.0 μm.GeV
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