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Transfer Line -2 Optics Design For CTF3

Transfer Line -2 Optics Design For CTF3. Amalendu Sharma, Abdurrahim, A.D.Ghodke, Gurnam Singh and V.C. Sahni. Raja Ramanna Centre for Advanced Technology Indore – 452 013 India. CTF3 Collaboration meeting, January 2008, CERN. Indian Contribution. TL-2 @ CTF3. Optics of TL-2.

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Transfer Line -2 Optics Design For CTF3

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  1. Transfer Line -2 Optics Design For CTF3 Amalendu Sharma, Abdurrahim, A.D.Ghodke, Gurnam Singh and V.C. Sahni Raja Ramanna Centre for Advanced Technology Indore – 452 013 India CTF3 Collaboration meeting, January 2008, CERN

  2. Indian Contribution TL-2 @ CTF3 Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  3. Status of Optics Design • Optics design for required tuning range of R56 completed and delivered to CERN in October 2007. • T566 suppression in entire range with low emittance dilution • Studies do not include wake field/ CSR effects Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  4. Parameters required • R56 -0.30m to +0.30m • T566 0 in entire range •  blow up  <10% Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  5. Magnets Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  6. Design of line: Modules Module-1 Extraction of Combiner Ring to first bending magnet Horizontal Achromat with 2 phase advance Module-2 Module-1 to Module-3 Consist of a clear space for Tail Clipper Clear element free space for Emergency Exit Vertical Achromat Matching triplet for module-3 Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  7. Module-3 Module-2 to CLEX entrance Tunable R56 arc with T566 suppression provision Final matching doublet Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  8. Combiner Ring Septum-1 Septum-2 QF-1-slim QD-slim Previous version QF-2-TSL ~1200mm ~500mm Present version Module-1 Not to scale Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  9. ~1.3m TSL type TSL type Standard type Standard type Qd Qf Qd Qf Qd Qf Qd Qf Vertical Dogleg Place for Tail Clipper ~4m Front of emergency exit ~1.6m Module-2 Qd Qf Qd Not to scale Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  10. ~289mm -30.75 Minor geometrical error in previous version -17.25 Geometrical changes from previous version CLEX Wall 17.25 30.75 Module-3 Not to scale Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  11. Module-3 Continued…. • Mainly constrained by the building geometry • Tunable R56 arc has a symmetry • Two types of dipoles are used • Four sextupoles (driven by two supplies) for T566 suppression • Sufficient space for placing the correctors, BPMs, bellows and vacuum pumps Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  12. Layout of line Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  13. Beta function and dispersion R56 = -0.30m Sign convention of MAD-8 Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  14. Beta function and dispersion Continued… R56 = 0.00m Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  15. Beta function and dispersion Continued… R56 = +0.30m Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  16. Beam size and chamber aperture *  x, y < 40m and Dx < 2.5m, Thus beam size (3, 1% p/p) < 25mm R56 = -0.30m R56 = 0.00m R56 = +0.30m Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  17. T566 correction • Objective: • T566 zero in entire range of R56 tuning • Dispersion is kept higher @ sextupoles to remain within specified strengths • Phase space distortion not too high • Problem: • -I transformer not possible in whole range of tuning • Adjusting quadrupole strengths in module-3 for lowering aberration; a very hard task -> changes dispersion and thus R56 Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  18. T566 correction Continued… • Solution: • Sextupole strength decided by mainly dispersion • Aberration depends on beta function and phases @ sextupoles • Try to obtain the initial conditions @ Module-3 so that the sum of kicks due to sextupoles become minimum Less phase space distortion without disturbing dispersion wave Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  19. Phase space distortion On momentum particles (2) R56 = +0.30m R56 = 0.00m R56 = -0.30m X-Plane Y-Plane Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  20. Phase space distortion On momentum particles (2) R56=-0.15 R56=-0.10 R56=-0.05 R56=-0.25 R56=-0.20 X-Plane Y-Plane Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  21. Phase space distortion On momentum particles (2) R56=0.15 R56=0.10 R56=0.05 R56=0.25 R56=0.20 X-Plane Y-Plane Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  22. Phase space distortion Continued… Off momentum particles (X-Plane) R56 = +0.30m R56 = 0.00m R56 = -0.30m 1% dp/p -1% dp/p Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  23. Phase space distortion Continued… Off momentum particles (Y-Plane) R56 = +0.30m R56 = 0.00m R56 = -0.30m 1% dp/p -1% dp/p Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  24. Magnets and power supplies Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  25. Low dispersion optics Additional optics design for easy commissioning So far : Higher dispersion for T566 correction During Initial run : Low dispersion optics in which sextupoles not switched on R56 = -0.30m Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  26. Low dispersion optics Continued… R56 = 0.00m Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  27. Low dispersion optics Continued… R56 = +0.30m Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  28. Summary • Optics design for entire range of R56 using the available magnets (five new dipoles) completed and delivered to CERN • T566 corrected in whole range of tuning • Sextupole scheme is optimized for low phase space distortion • Additional Low dispersion optics for initial run (T566 ~ -1, while in high dispersion mode T566 ~ -3 to -41) incorporated. Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  29. Acknowledgements • Hans Braun • Gunther Geschonke • Frank Tecker Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  30. Thanking you Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

  31. Optics of TL-2 CTF3 Collaboration meeting, January 2008, CERN

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