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Super-c-tau in Novosibirsk

Super-c-tau in Novosibirsk. Bogomyagkov Budker Institute of Nuclear Physics Novosibirsk International Workshop on e+e- collisions from Phi to Psi September 19-22, 2011. Requirements. Beam energy from 1.0 to 2.5 GeV Peak luminosity is 10 35 cm -2 s -1 at 2 GeV

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Super-c-tau in Novosibirsk

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  1. Super-c-tau in Novosibirsk Bogomyagkov Budker Institute of Nuclear Physics Novosibirsk International Workshop on e+e- collisions from Phi to Psi September 19-22, 2011

  2. Requirements • Beam energy from 1.0 to 2.5 GeV • Peak luminosity is 1035 cm-2s-1 at 2 GeV • Electrons are polarized longitudinally at IP • Energy calibration by Compton backscattering (~(5  10)10-5) A.Bogomyagkov (BINP)

  3. Details • Two rings with Crab Waist collision scheme and single interaction point • Sub-mm y at IP • Preserving of emittance and damping times through the whole energy range to optimize the luminosity • 5 Siberian snakes to obtain the longitudinally polarized electrons for the whole energy range • Highly effective positron source (50 Hz top-up injection) • Polarized electron source • 2.5 GeV full energy linac A.Bogomyagkov (BINP)

  4. Crab Waist (P.Raimondi 2006) • Large Piwinski’s angle (z/x∙/2) – to decrease the overlapping area • Low y – luminosity increase • Crab waist – to suppress betatron resonances (sextupoles in phase with IP) A.Bogomyagkov (BINP)

  5. Main ring scheme A.Bogomyagkov (BINP)

  6. Facility scheme A.Bogomyagkov (BINP)

  7. Cite A.Bogomyagkov (BINP)

  8. Parameters A.Bogomyagkov (BINP)

  9. Optical functions IP: y=0.8 mm, x=40 mm A.Bogomyagkov (BINP)

  10. Final focus Compensation Solenoid Detector Yoke Cryostat Anti Solenoid e+ e- QD0 QF1 A.Bogomyagkov (BINP)

  11. Final focus A.Bogomyagkov (BINP)

  12. QD0 quadrupole • SC iron yoke twin aperture magnet • Excitation current 8.5 kA·turns • Single aperture 2 cm • Gradient 10.7 kGs/cm • Length 20 cm • Prototype production has started! A.Bogomyagkov (BINP)

  13. Radiation parameters 4x1.5m Wigglers @ 50 kGs λ=20cm A.Bogomyagkov (BINP)

  14. Damping wiggler Wiggler field amplitude vs energy Wiggler prototype is ready A.Bogomyagkov (BINP)

  15. Polarized electron source In 1995 this kind of PES was developed by BINP for NIKHEF (Amsterdam). Well-known technology! A.Bogomyagkov (BINP)

  16. Polarization scheme Arrows show the electrons spin direction Electrons come from polarized source and 2.5 GeV linac A.Bogomyagkov (BINP)

  17. Polarization degree versus energy 5 snakes 3 snakes 1 snake

  18. Luminosity tune scan • CW advantage: • BB coupling resonances are suppressed • Wide red area corresponds to 1035 cm-2s-1 A.Bogomyagkov (BINP)

  19. Beam-Beam simulation Working BB parameter CW advantage: even for y = 0.2 there is no large beam blow-up and luminosity degradation. Safety margin for BB effects! A.Bogomyagkov (BINP)

  20. Energy acceptance Energy bandwidth 2% with chromaticity corrected and all main nonlinearities (including the crab sextupoles) is obtained. A.Bogomyagkov (BINP)

  21. Dynamic aperture ΔE/E = 0 ΔE/E = -0.5% ΔE/E = +0.5% A.Bogomyagkov (BINP)

  22. Injection facility A.Bogomyagkov (BINP)

  23. Construction FF region Ready-built tunnel Technical reg. (RF and injection) Damping wiggler sections A.Bogomyagkov (BINP)

  24. Conclusion • The lattice, meeting all main requirements (800 m y, chromatic correction, momentum bandwidth, longitudinal polarization, luminosity optimization for wide energy range, etc. ) is ready. • FF key element, twin-aperture SC quadrupole prototype is being manufactured. • Prototype of the damping wiggler is ready. • Civil construction is under way. • Detailed machine design and beam dynamics simulation is in progress. A.Bogomyagkov (BINP)

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