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Update on design of final TALs in the CLIC Drive Beam

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

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Update on design of final TALs in the CLIC Drive Beam

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  1. Update on design of final TALs in the CLIC Drive Beam R. Apsimon, J. Esberg

  2. 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

  3. 20 sextupoles used • 4 sextupoles per arc cell • Maximum pole-tip field ~0.018 T

  4. Locally optimised solution

  5. Globally optimised solution

  6. Dispersion energy dependence

  7. R56 energy dependence

  8. Emittance growth vs sextupole strength: PLACET tracking

  9. Emittance growth vs sextupole strength: PLACET tracking

  10. Emittance growth vs sextupole strength: PLACET tracking

  11. Emittance growth vs sextupole strength: MADX-PTC tracking Horizontal Vertical Longitudinal

  12. PLACET tracking: longitudinal phase space: no synchrotron radiation

  13. Emittance growth vs sextupole strength: PLACET tracking Horizontal Vertical Longitudinal

  14. PTC tracking emittance growth

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