SuperB Overview John Seeman Accelerator Systems Division SLAC

Super-B Overview John Seeman Accelerator Systems Division SLAC National Accelerator Laboratory Feb 15, 2009 Super-B Orsay Meeting 1

Outline * * * * Overview Results from Mini-MAC Meeting July 2008 Super-B parameters and updates Interaction region Lattice Polarization RF Collective effects Feb 15, 2009 Super-B Orsay Meeting 2

Super-B Project * Super-B aims at the construction of a very high luminosity (1 x 1036 cm-2 s− 1) asymmetric e+e− flavor factory, with the location at the campus of the University of Rome Tor Vergata, near the INFN Frascati National Laboratory. * Aims: – – – Very high luminosity High reliability Polarized e- at IP Ability to collide at the Y 4 S and the J/Psi Flexibility in achieving the luminosity goals Feb 15, 2009 Super-B Orsay Meeting 3

Super-B Accelerator Contributors * M. E. Biagini, 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, M. Donald, A. Fisher, S. Heifets, A. Krasnykh, A. Novokhatski, M. Pivi, C. Rivetta, J. Seeman, M. Sullivan, U. Wienands, W. Wittmer, G. Yocky (SLAC, USA) * E. Levichev, I. Koop, S. Nikitin, P. Piminov, D. Shatilov, M. Zobov (BINP, Russia) * A. Wolski (Liverpool University, UK) * M. Venturini (LBNL, US) * S. Bettoni (CERN, Switzerland) * A. Variola (LAL/Orsay, France) * G. Marchiori, E. Paoloni (Pisa University, Italy) * T. Agoh, K. Ohmi, K. Oide, Y. Ohnishi (KEK, Japan) Feb 15, 2009 Super-B Orsay Meeting 4

Super. B footprint on Tor Vergata site SPARX Super. B Ring (about 1800 m) Super. B Injector (about 400 m) Roman Villa 100 m Super. B Main Building Feb 15, 2009 Super-B Orsay Meeting 5

Sky View * Feb 15, 2009 Super-B Orsay Meeting 6

Crab Waist (Raimondi) * Feb 15, 2009 Super-B Orsay Meeting 7

Beams distribution at IP E. Paoloni Crab sextupoles OFF Without waist line is orthogonal Crab-sextupoles to the axis of one bunch Crab sextupoles ON With Crab-sextupoles waist moves to the axis of other beam All particles from both beams collide in the minimum by region, with a net luminosity gain Feb 15, 2009 Super-B Orsay Meeting 8

Biagini Lattice layout, PEP-II magnets reuse Total length 1800 m 0 m 2 Lmag (m) 0. 45 5. 4 PEP HER - 194 PEP LER 194 - Available SBF HER - 130 Needed SBF LER 224 18 SBF Total 224 148 Needed 30 0 Dipoles Quads 280 m Lmag (m) 0. 25 0. 5 PEP HER/LER 188 - SBF Total 372 4 Needed 184 4 Sexts Lmag (m) 0. 56 0. 73 0. 43 0. 7 0. 4 PEP HER 202 82 - - - PEP LER - - 353 - - SBF HER 165 108 - 2 2 SBF LER 88 108 165 2 2 SBF Total 253 216 165 4 4 Needed 51* 134 0 4 4 All PEP-II magnets are reused. Dimensions and fields are properly sized. Feb 15, 2009 Super-B Orsay Meeting 9

Suggestions from Mini-MAC July 2008 * * * Exciting project! Establish a management team Focus design on 1 x 1036 collider as a base line Plan for parameter flexibility Finish tests of crab-waist at DAFNE Perform beam-beam simulations (strong-strong) Evaluate tolerances Work on dynamic aperture calculations Design IR layout Develop a polarization rotation scheme Add details to the site layout Define the injection scheme Feb 15, 2009 Super-B Orsay Meeting 10

DAFNE Luminosity versus Ib 2: Very positive! Congratulations! * Feb 15, 2009 Super-B Orsay Meeting 11

Crab Sextupoles Improve luminosity * Feb 15, 2009 Super-B Orsay Meeting 12

Beam-Beam Simulation of DAFNE (Ohmi) * Feb 15, 2009 Super-B Orsay Meeting 13

July 2008 * Feb 15, 2009 Super-B Orsay Meeting 14

* Biagini Feb 15, 2009 Super-B Orsay Meeting 15

Super. B Interaction Region Layout View (Jan 2009) Sullivan Feb 15, 2009 Super-B Orsay Meeting 16

SC Quadrupoles at the IP (Paoloni, Bettoni) * Feb 15, 2009 Super-B Orsay Meeting 17

Initial Lost Particles backgrounds (M. Boscolo) * Feb 15, 2009 Super-B Orsay Meeting 18

Locations of Fast Kickers for Luminosity Feedback * K. Bertsche Feb 15, 2009 Super-B Orsay Meeting 19

Super-B Beam-Beam Simulation (Ohmi) * Feb 15, 2009 Super-B Orsay Meeting 20

Beam-Beam Simulation (Ohmi) (Feb 10, 2009) * Feb 15, 2009 Super-B Orsay Meeting 21

Lattice overview * * The Super. B 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 * * The design is flexible but challenging and the synergy with the ILC Damping Rings which helped in focusing key issues, will be important for addressing some of the topics 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. Dynamic aperture calculations have continued. Feb 15, 2009 Super-B Orsay Meeting 22

Arc cells layout Cell #1 HER LER Cell #2 Feb 15, 2009 M. Biagini Super-B Orsay Meeting 23

* Feb 15, 2009 Super-B Orsay Meeting 24

IR Longitudinal Polarization * Polarization of one beam is included in Super. B – Either energy beam could be the polarized one – The LER would be less expensive, the HER easier – HER was chosen for now. * 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: – Solenoids look 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 Feb 15, 2009 Super-B Orsay Meeting 25

Example of spin rotators Summer 2008 U. Wienands Proof-of-principle scheme No V-emittance growth. Maybe possible to incorporate into lattice using the Final Focus bends to provide the spin rotation. Work in progress Feb 15, 2009 Super-B Orsay Meeting 26

Winter 2009 W. Wittmer * Feb 15, 2009 Super-B Orsay Meeting 27

Polarization versus Energy of HER (Wienands) * Feb 15, 2009 Super-B Orsay Meeting 28

Possible layout with spin rotators near IR (Wienands) * Feb 15, 2009 Super-B Orsay Meeting 29

RF Plan: Use PEP-II RF system and cavities * Feb 15, 2009 Super-B Orsay Meeting 30

S. Novokhatski Super-B RF: Supply power Jan 2009 31 01/26/09 Feb 15, 2009 Super-B Orsay Meeting 31

Impedance budget from S. Novokhatski Feb 15, 2009 In progress Super-B Orsay Meeting 32

Super-B Feedback Parameters (A. Drago) * Feb 15, 2009 Super-B Orsay Meeting 33

New feedback Kicker design (A. Krasnykh) * Feb 15, 2009 Super-B Orsay Meeting 34

Conclusions * The Super-B parameters are being optimized around 1 x 1036. * The Mini-MAC in July made good suggestions. All being addressed. * IR design (Jan 2009) has a strong basis to start adding subtle features. * IR polarization (spin) rotators have now been added to the HER lattice. Ring geometrical layout changed a bit. * Beam-beam and dynamic aperture calculations have started. Need to make this work well. * Beam loading and RF parameters have taken the next step. Looks ok. * Next Mini-MAC in late April. * Planning for the Technical Design Report has started. Feb 15, 2009 Super-B Orsay Meeting 35

Oide * Feb 15, 2009 Super-B Orsay Meeting 36

Suzuki Summary of KEK Roadmap 2007 2008 2009 2010 2011 2012 operation & completion of 1 st goal J-PARC power upgrade upgrading to Super-KEKB Photon Factory operation & upgrade continue R&D and compact ERL R&D construction operation 1 st results LHC upgrade TDP 1 ILC R&D Feb 15, 2009 Super-B Orsay Meeting lots 37 and lots of R&D’s TDP 2

Conclusion Image of the Roadmap for Particle Physics in the Next Decade LHC　　　　 Kam. LAND Super-Kamiokande Feb 15, 2009 K-decay, Super-B MEG, Orsay m: g-2 …. . Meeting 38