COOL11 eRHIC: ERL-Ring ep 2 He 379 Au 19792 U 238 Energy, GeV20325215130 CM energy, GeV 161131102 Number of bunches/distance between bunches 74 ns166 Bunch intensity (nucleons),10 11 0.242355 Bunch charge, nC3.8323119 Beam current, mA50420411250260 Normalized emittance of hadrons, 95%, mm mrad 1.2 Normalized emittance of electrons, rms, mm mrad 233557 Polarization, %8070 none rms bunch length, cm0.24.9888 β*, cm55555 Luminosity per nucleon,x10 34 cm -2 s -1 (hourglass effect is included) 1.461.390.860.92 Reaching high luminosity: high average electron current (50 mA = 3.5 nC * 14 MHz) energy recovery linacs; SRF technology high current polarized electron source cooling of high energy hadrons (Coherent Electron Cooling) β*=5 cm IR with crab-crossing Reaching high luminosity: high average electron current (50 mA = 3.5 nC * 14 MHz) energy recovery linacs; SRF technology high current polarized electron source cooling of high energy hadrons (Coherent Electron Cooling) β*=5 cm IR with crab-crossing Protons Electrons GeV100130250325 50.62 (3.1)1.4 (5)9.715 100.62 (3.1)1.4 (5)9.715 200.62 (3.1)1.49.715 300.120.281.93 Polarized (unpolarized) e (80%) –p (70%) luminosities in 10 33 cm -2 sec -1 units Au ions Electrons GeV5075100130 52.58.311.418 102.58.311.418 200.491.73.98.6 300.10.340.771.7 Limiting factors: - hadron ΔQ sp ≤ 0.035 - hadron ξ ≤ 0.015 - polarized e current ≤ 50 mA - SR power loss ≤ 7 MW Limiting factors: - hadron ΔQ sp ≤ 0.035 - hadron ξ ≤ 0.015 - polarized e current ≤ 50 mA - SR power loss ≤ 7 MW
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