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Super-B Factory Scenarios

Super-B Factory Scenarios. John Seeman Assistant Director PPA Directorate SLAC SLUO Meeting September 11, 2006. Super-B Contributors (Accelerator): LNF: Biagini, Raimondi, Zobov Pisa: Giorgi, Paoloni BINP: Koop, Levichev, Shatilov KEKB: Ohmi SLAC: Novokhatski, Roodman, Seeman,

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Super-B Factory Scenarios

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  1. Super-B Factory Scenarios John Seeman Assistant Director PPA Directorate SLAC SLUO Meeting September 11, 2006

  2. Super-B Contributors (Accelerator): LNF: Biagini, Raimondi,Zobov Pisa: Giorgi, Paoloni BINP: Koop,Levichev, Shatilov KEKB: Ohmi SLAC: Novokhatski, Roodman, Seeman, Seryi, Sullivan, Wienands Caltech: Albert Also: PEP-II and KEKB staff

  3. Super-B Workshops • Frascati: November 2005 • Daresbury: April 2006 • SLAC: June 2006 • KEK: September 13-15, 2006 • SLAC: October 19-24, 2006 • Frascati: November 13-15, 2006

  4. Outline • There are two present avenues of study for a future very high luminosity B-Factory: • Super KEKB (extension of present machines) • Use existing KEK tunnel, magnets, RF system, • New injector, vacuum system, crab cavities, IR • High current and high AC power • “Damping ring style” collider “Super-B” (new concept): • New lattice similar to ILC damping ring • New IR similar to ILC final focus • Crab-waist for low vertical beta but long bunches • Present currents and low AC power • Reuse “PEP-II RF and magnets”

  5. K. Oide

  6. 0.79 ?

  7. To be tested in 2007

  8. K. Ohmi Sept 2006

  9. Horizontal tune even closer to the half integer (0.503) K. Oide

  10. K. Oide July 2006

  11. Super-B Factory ILC “like” rings & ILC “like” Final Focus P. Raimondi FF FF IP

  12. Super-B Factory Design • Design still fresh and changing • Started with ILC parameters but has evolved toward smaller rings as new features were added: • Full lattices developed • IR developed with good beam-stay-clear • New IR included in lattice studies • 4 GeV x 7 GeV • Dynamic apertures are good • Tune plane is good. • Fewer bunches are needed, so shorter rings than ILC

  13. Possible site: Tor Vergata near Frascati and Rome • Near INFN Frascati • Near future subway • 3 km rings possible

  14. K. Oide July 2006

  15. LER beam IP layout 2*q=30mrad L*=35cm QF1_LER QD0a 70cm Dq=28mrad 35cm QD0b Dq=9mrad 35cm 35cm QF1_HER 40cm QD0a and QD0b have the same Ks QD0a is shared, all the other quads are on the beams trajectories HER beam 35cm Raimondi August 2006

  16. Horizontal Plane Vertical Plane Collisions with crossing angle = 2*25mrad and long thin bunches with a small vertical beta. Raimondi

  17. x bY e- e+ 2Sx/q Vertical waist has to be a function of x: Z=0 for particles at –sx(- sx/2q at low current) Z= sx/q for particles at + sx(sx/2q at low current) Crabbed waist realized with a sextupole in phase with the IP in X and at p/2 in Y q 2Sz*q z 2Sz 2Sx Crabbed waist removes bb betratron coupling Introduced by the crossing angle

  18. FFTB-style Final Focus IP phase sextupoles

  19. HER cell Extra 1.2m bends LER cell Use PEP-II quads and dipoles

  20. HER ring lattice with FF (Option A: 2.7 km) August 2006

  21. HER ring lattice with FF (Option B: 1.7 km) September 2006

  22. Ring Parameters IP Parameters August 2006

  23. Luminosity vs current Nominal Zobov and Shatilov

  24. Beam size blowups vs current Zobov and Shatilov

  25. Luminosity Tune Scan (0.8/q, sz = 7 mm; 3x1010 particles) Lmax = 2.2x1036 cm-2 s-1 New Qx=0.57 Qy=0.60

  26. Luminosity and size blowups vs 2*q New 2*q =30mrad, by=133mm Larger crossing angle Ay Ax Ax = (0.0:20sx) Ay = (0.0:40sy)

  27. Ring dynamic aperture with FFTB-FF 20sx 40sx 20sx dp/p=0 dp/p=-0.5% dp/p=0.5% 20sy 12sy 12sy

  28. Recent Super-B Parameters Optimization • Relaxed damping time => 17msec • Relaxed y/x IP bs => 200mm/20mm • Relaxed y/x IP ss => 20nm/4mm • Relaxed crossing angle => 2*15mrad • Relaxed bunch length => 7mm • L dependence quadratic with current up to 1037 • L of 2 x 1036 is “possible” for 25 to 30 MW. • PEP-II magnets and 476 MHz RF system reused. • Wiggler sections added to shorten damping time.

  29. Conclusions • A very high luminosity B-Factory seems to have several possible technical avenues. • Recent studies show good progress for an “ILC like” ring and FF solution but of shorter length. • The AC power is similar to present B-Factories. • The study group aim is to have a “Technical Paper” written by the end 2006.

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