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Super-B Overview

Super-B Overview. John Seeman Accelerator Systems Division SLAC. Super-B Outline. Goals for the accelerator Super-B layout Super-B parameters Luminosity options Subsystems. Super-B Goals.

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Super-B Overview

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  1. Super-B Overview John Seeman Accelerator Systems Division SLAC Super-B Mini-MAC Meeting

  2. Super-B Outline • Goals for the accelerator • Super-B layout • Super-B parameters • Luminosity options • Subsystems Super-B Mini-MAC Meeting

  3. Super-B Goals • Super-B aims at the construction of a very high luminosity (1 x 1036 cm-2 s−1) asymmetric e+e− flavor factory, with possible location at the campus of the University of Rome Tor Vergata, near the INFN Frascati National Laboratory. • Aims: • Very high luminosity • Desire 1036: experimenters say 1035 will not get to the physics soon enough. • High reliability • The goal is integrated luminosity! • Polarized e- at IP • This is a relatively new addition by the users. • Ability to collide at Y4S and lower energy (~J/Psi) • For maximum number of experimenters. Super-B Mini-MAC Meeting

  4. Super-B Accelerator Contributors • D. Alesini, M. E. Biagini, R. Boni, M. Boscolo, T. Demma, A. Drago, S. Guiducci, M. Preger, P. Raimondi, S. Tomassini, C. Vaccarezza, M. Zobov (INFN/LNF, Italy) • K. Bertsche, Y. Cai, A. Fisher, S. Heifets, A. Novokhatski, M.T. Pivi, J. Seeman, M. Sullivan, U. Wienands, W. Wittmer (SLAC, US) • T. Agoh, K. Ohmi, Y. Ohnishi (KEK, Japan) • I. Koop, S. Nikitin, E. Levichev, P. Piminov, D. Shatilov (BINP, Russia) • A. Wolski (Liverpool University, UK) • M. Venturini (LBNL, US) • S. Bettoni, D. Schulte (CERN, Switzerland) • A. Variola (LAL/Orsay, France) • E. Paoloni, G. Marchiori (Pisa University, Italy) Super-B Mini-MAC Meeting

  5. The Super-B Process (M. Biagini) 2th Joint Japan-US SuperB-Factory Workshop, Hawaii, US International SuperB Steering Committee established 4th SuperB Workshop, Villa Mondragone, Italy Accelerator test started at DAFNE, LNF, Italy International SuperB Study Group formed 5th SuperB Workshop in Paris, France International Review Committee setup CDR presented to INFN Management ICFA08 Workshop at BINP, Russia CERN strategy group presentation Detector R&D workshop, SLAC,US Physics retreat at Valencia, Spain 1st Accelerator retreat, SLAC, US 2th Accelerator retreat, SLAC, US 2nd SuperB Workshop, LNF, Italy 3rd SuperB Workshop, SLAC, US 1st SuperB Workshop, LNF, Italy SuperB meeting, Daresbury,UK 2nd IRC meeting, Rome, Italy SuperB Meeting in Elba, Italy Mini MAC, EPAC08, Italy 1st IRC meeting, LNF, Italy 2nd Meeting with ECFA CDR presented to ECFA CDR writing started CDR published • 9 11 3 4 6 9 11 12 • 5 5 7 7 9 11 12 1 2 3 44 6 6 .. Month 2005 2006 Super-B Mini-MAC Meeting 2007 2008

  6. Super-B CDR Spring 2007 Initial Super-B design with the ILC damping ring parameters. These parameters are still valid. However, the parameters have evolved since the CDR to minimize power, shorten the tunnel, and and add polarization. Super-B Mini-MAC Meeting

  7. SuperB Ring (about 1800m) SPARX SuperB Injector (about 400m) Roman Villa 100m SuperB Main Building SuperB footprint on Tor Vergata site Super-B Mini-MAC Meeting

  8. What about SPAR-X FEL? Super-B Mini-MAC Meeting

  9. Super-B builds on the Successes of Past Accelerators • PEP-II LER stored beam current (3.2 A in 1722 bunches (4 nsec) at 3.1 GeV at 23 nm with little ECI effect on luminosity. • Low emittance lattices designed for ILC damping rings, PETRA-3, NSLC-II, and PEP-X. (few nm horizontal x few pm vertical) • Very low emittance achieved in an ILC test ring: ATF. • Successful crab-waist luminosity improvement at DAFNE in Frascati. • Successful crab-cavity tests at KEKB at low currents. • Spin manipulation tests in Novosibirsk. • Efficient spin generation with a high current gun and spin transport to the final focus at the SLC. • Successful two beam interaction region built by KEKB and PEP-II. • Continuous injection works with the detector taking data (KEKB and PEP-II) Super-B Mini-MAC Meeting

  10. Basic concepts • Two options: • High currents • Very high currents • Smaller damping time High power components • Shorter bunches Costly to operate • Crab cavities for head-on collision • Higher power • SuperB exploits an alternative approach, with a new IP scheme: • Small emittance beams (ILC-DR like) • Large Piwinski angle and “crab waist” • Currents comparable or smaller than present Factories A lot of fine tuning! Super-B Mini-MAC Meeting

  11. SuperB Parameters Add to these parameters head room factors: X 2 in beam current X 2 in number of bunches Injection rate for higher losses IP beta ranges (Biagini) Super-B Mini-MAC Meeting

  12. Super-B transparency condition • To have equal tune shifts with asymmetric energies in PEP-II and KEKB the “design” beam currents ratio is: I+/I- ~ E-/E+ • Due to SuperB large crossing angle, new conditions are possible: LER and HER beams can have different emittances and b* and equal currents  Option 2 for SuperB Option 1 for Super-B Super-B Mini-MAC Meeting

  13. Comparison of Super-B to SuperKEKB Super-B Mini-MAC Meeting

  14. Super-B vs Super-KEKB Super-B Mini-MAC Meeting

  15. Super-B Parameter Flexibility (All with 1036)(LER/HER) Super-B Mini-MAC Meeting

  16. (M. Sullivan) Super-B Mini-MAC Meeting

  17. Crab Waist (Raimondi) Super-B Mini-MAC Meeting

  18. Beams distribution at IP E. Paoloni Crab sextupoles OFF waist line is orthogonal to the axis of one bunch Crab sextupoles ON waist moves to the axis of other beam All particles from both beams collide in the minimum by region, with a net luminosity gain Super-B Mini-MAC Meeting

  19. Crab-waist Studies at DAFNE at INFN Frascati • P. Raimondi et al: DAFNE upgrade with improved interaction region to focus tighter the beams at IP and have a “large” crossing angle  large Piwinski angle • Features: • Smaller collision area • Lower b*y • No parasitic crossings • No synchro-betatron resonances due to the crossing angle • “Crab Waist” sextupoles • Results successful and very encouraging so far with improved tunes shifts and higher luminosity with smaller currents. Super-B Mini-MAC Meeting

  20. DAFNE Crab Waist Tests Super-B Mini-MAC Meeting

  21. Lattice • The SuperB lattice as described in the Conceptual Design Report is the result of an international collaboration between experts from BINP, Cockcroft Institute, INFN, KEKB, LAL/Orsay, SLAC • Simulations were performed in many labs and with different codes: • LNF, BINP, KEK, LAL, CERN • Further studies after the CDR • completion led to an evolution of • the lattice to fit the Tor Vergata Site • and to include polarization • manipulation hardware. M. Biagini Super-B Mini-MAC Meeting

  22. HER LER Arc cells layout M. Biagini Cell #1 Cell #1 Cell #2 Cell #2 Super-B Mini-MAC Meeting

  23. Interaction Region Similar to ILC IR Super-B Mini-MAC Meeting

  24. Total length 1800 m 20 m 280 m Lattice layout, PEP-II magnets reuse Dipoles Available Needed Quads Sexts All PEP-II magnets are reused. Dimensions and fields are properly sized. Super-B Mini-MAC Meeting

  25. PEP-II RF Cavities Early design and testing at LBL. High power production cells. Fully fitted cavity units with HOM dampers. Super-B Mini-MAC Meeting

  26. B-Factory RF Klystrons (1.2 MW) Super-B Mini-MAC Meeting

  27. Super-B RF Parameters Novokhatski Super-B Mini-MAC Meeting

  28. Injection Needed rate: 1.85 A = 3E13 particles Lifetime = 15 minute Injector = 5E9 at 100 Hz. R. Boni Super-B Mini-MAC Meeting

  29. Polarization • Polarization of one beam is included in SuperB • Either energy beam could be the polarized one • The LER would be less expensive, the HER easier • HER was chosen. • Longitudinal polarization times and short beam lifetimes indicate a need to inject vertically polarized electrons. • The plan is to use a polarized e- source similar to the SLAC SLC source. • There are several possible IP spin rotators: • Solenoidslook better at present (vertical bends give unwanted vertical emittance growth) • Expected longitudinal polarization at the IP of about 87%(inj) x 97%(ring)=85%(effective) • Polarization section implementation in lattice: in progress with initial success U. Wienands Super-B Mini-MAC Meeting

  30. HER spin manipulation hardware Spin rotators in the HER Full HER lattice Wittmer, Wienands, Biagini Super-B Mini-MAC Meeting

  31. Conclusions • The SuperB design meets the goals requested by the experimenters. • IR polarization rotators have now been added to the lattice. • The next phase for the accelerator group is to form a team to work on a Technical Design Report including engineering. • A Change Control Board for parameters is likely needed. • The areas for further concentration: • Low emittance generation, tuning, dynamic aperture • Crab waist issues • IR design (low betas) • Beam-beam interaction (layout) • Continuous injection with polarization and tolerances • Further beam dynamics studies with ECI for e+ and ions for e- • Vibration analysis. Super-B Mini-MAC Meeting

  32. Super-B Mini-MAC Meeting

  33. Super-B Mini-MAC Meeting

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