Polarization at the Super-B Factory

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Presentation transcript:

Polarization at the Super-B Factory J. Seeman SLAC IRC Meeting November 13, 2007

Polarization studies for Super-B Contributions from: I. Koop (BINP) S. Nikitin (BINP) M. Preger (INFN Frascati) P. Raimondi (INFN Frascati) J. Seeman (SLAC) U. Wienands (SLAC)

Why not let the beam self-polarize? Polarization time: SBF beam lifetime =~ 5 minutes  Inject polarized electrons from the linac

Ring Layout (from F. Forti) SuperB Ring (about 1800m) SPARX SuperB Injector (about 400m) Roman Villa 100m SuperB Main Building

Polarization Components from the SLC at SLAC Example of Injected Polarized Electrons Polarization Components from the SLC at SLAC Polarized Photo-Gun 120 Hz, 87% 2 x 5x10^10/pulse Spin manipulators SLC IP Located at the Stanford Linear Accelerator Center Polarization equipment ready for reuse!

IP Spin Rotation

Spin Transport Issues Spin rotation x-y coupling Spin chromaticity Depolarizing resonances IP symmetry Beam-beam forces

“Foot print” shape preferred

Alternative #1of IP Spin Rotator

Alternative #2 of IP Spin Rotator Derbenev, Kondratenko, Skrinsky, 1977 Snake rotates spin by 1800 around z-axis Snake In arcs spin lies in the horizontal plane At IP the spin is directed longitudinally (exactly!) IP

Polarization times LER: HER: Best energies: 3.83 GeV, 4.10 GeV to avoid resonances Polarization times: 10800 sec with antisymmetric IP horiz. bends 3300 sec with symmetrical IP horiz. bends HER: Best energies: 6.92 GeV, 7.18 GeV to avoid resonances Polarization time: 2800 sec with antisymmetric IP horiz. bends

Polarization Conclusions Polarization of one beam is included in Super-B. Either energy beam could be the polarized one. The LER would be less expensive. Long polarization times and short beam lifetimes indicates a need to inject polarized electrons in the vertical plane. There are several possible IP spin rotators. Solenoids look better at present. Expected longitudinal polarization at the IP of about 87%(inj) x 97%(ring)=85%(effective).