Flexibilities of erin lattice格的E环的灵活性.pptVIP

e+e- factories 2003 Oct. 15, 2003 Lepton ring lattice for eRHIC, e+e- factories 2003 Lattice design of a 10 GeV electron ring for eRHIC D. Wang, MIT-Bates Lab, for the e-RHIC team from BNL, BINP, DESY, MIT-Bates The 30th ICFA Beam Dynamics Workshop on e+e- Factories 2003, Oct.13-16, SLAC Outline Introduction Ring geometry Luminosity parameters IR solutions Polarization issues Flexibilities and DA Summary Brief history 2001: eRHIC grew out of joining of two communities: eRHIC (BNL, at BNL) + EPIC(BINP-MIT, at MIT) = Electron Ion Collider ? now called eRHIC February 2002: White paper submitted to NSAC Long Range Planning Review February 2003: NSAC Subcommittee Recommendation. Design goals of e-RHIC Particle species lepton: e- and e+ hardron: proton, gold ion Au(A=197, Z=79) Beam energy lepton: 5~10 GeV hadron: 25(?)~250 GeV for proton, 100 GeV/n for Au Luminosity e-p collision: 1E32~1E33 cm-2s-1 e-Au collision: 1E30~1E31 cm-2s-1 Longitudinal Polarization lepton: e-, 5~10 GeV, e+, 10 GeV, proton: up to 250 GeV What’s special in lattice design of eRHIC e-ring High luminosity: beam-beam is pushed to limit. (HERA, not totally) round beam becomes attractive, though difficult Flexibility: many particle species, beam energies. multi operation modes, very flexible lattice Polarization: longitudinal polarized beam in a wide energy range right rotator + good spin matching + compensation Evolution of the e-ring design Initial designs * ring-ring option * large circumference (RHIC tunnel) or compact design(1/4 of RHIC’s) * round beam for both lepton and hadron beams. * anti-symmetric spin rotator + super-bend ST polarization In recent months, the eRHIC design has been intensified towards the Zero-th order Design Report (ZDR) by the collaboration. Since May, five meetings on accelerator designs have been held in BNL and MIT, plus tele-conferences bi-weekly. * ring-ring option, (ring-l