update on design of final tals in the clic drive beam
DESCRIPTION
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 PresentationTRANSCRIPT
![Page 1: Update on design of final TALs in the CLIC Drive Beam](https://reader036.vdocuments.mx/reader036/viewer/2022062305/568166c3550346895ddad047/html5/thumbnails/1.jpg)
Update on design of final TALs in the CLIC Drive Beam
R. Apsimon, J. Esberg
![Page 2: Update on design of final TALs in the CLIC Drive Beam](https://reader036.vdocuments.mx/reader036/viewer/2022062305/568166c3550346895ddad047/html5/thumbnails/2.jpg)
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
![Page 3: Update on design of final TALs in the CLIC Drive Beam](https://reader036.vdocuments.mx/reader036/viewer/2022062305/568166c3550346895ddad047/html5/thumbnails/3.jpg)
• 20 sextupoles used– 4 sextupoles per arc cell– Maximum pole-tip field ~0.018 T
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Locally optimised solution
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Globally optimised solution
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Dispersion energy dependence
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R56 energy dependence
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Emittance growth vs sextupole strength: PLACET tracking
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Emittance growth vs sextupole strength: PLACET tracking
![Page 10: Update on design of final TALs in the CLIC Drive Beam](https://reader036.vdocuments.mx/reader036/viewer/2022062305/568166c3550346895ddad047/html5/thumbnails/10.jpg)
Emittance growth vs sextupole strength: PLACET tracking
![Page 11: Update on design of final TALs in the CLIC Drive Beam](https://reader036.vdocuments.mx/reader036/viewer/2022062305/568166c3550346895ddad047/html5/thumbnails/11.jpg)
Emittance growth vs sextupole strength: MADX-PTC tracking
HorizontalVertical
Longitudinal
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PLACET tracking: longitudinal phase space: no synchrotron radiation
![Page 13: Update on design of final TALs in the CLIC Drive Beam](https://reader036.vdocuments.mx/reader036/viewer/2022062305/568166c3550346895ddad047/html5/thumbnails/13.jpg)
Emittance growth vs sextupole strength: PLACET tracking
HorizontalVertical
Longitudinal
![Page 14: Update on design of final TALs in the CLIC Drive Beam](https://reader036.vdocuments.mx/reader036/viewer/2022062305/568166c3550346895ddad047/html5/thumbnails/14.jpg)
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