Low Energy Electron-Ion Collision 2nd MEIC IR/Detector Workshop Nov. 5, 2012

MEIC Schematic Layout

LEIC Design Parameters Beam energy GeV 20 5 7.5 10 CM energy (s2) GeV2 400 600 800 Collision frequency MHz 750 Particles per bunch 1010 0.17 2.5 0.21 0.71 0.23 Beam current A 0.2 3 0.25 0.85 0.27 Polarization % >70 ~ 80 Energy spread 10-4 ~ 3 7.1 RMS bunch length m 2 0.75 Emittance, normalized µm rad 53.5 120 280 Horizontal & vertical β* cm 3.4 2.3 1.25 Beam-beam tune shift 0.015 0.007 0.004 0.001 0.002 Laslett tune shift 0.058 Small 0.073 small Luminosity per IP, 1033 cm-2s-1 1.3* 0.47* 0.15* There is a small hour glass effect, causing 10% to 15% luminosity loss Total tune-shift (space-charge + beam-beam) ≤ 0.075 for ion Round ion beams due to low energy 3

IP e-Cooler