Deuteron and Small Aperture Yuhong Zhang February 7 , 2019

Electron-Deuteron Luminosity CM energy GeV 31.6 44.7 D e p Beam energy GeV/u 50 5 100 Collision frequency MHz 476 Particles per bunch 1010 0.42 3.9 Beam current A 0.32 3 Polarization % 80 Bunch length, RMS cm 1 2 Norm. emitt., horiz./vert. μm 0.5/0.1 90/18 0.5/ 0.1 Horiz, & verti. β* 6.75/1.35 13.5/ 13.5 16.5/3.3 8.4/1.7 Vert. beam-beam param. 0.008 0.02 Laslett tune-shift 0.024 0.006 Detector space, up/down m 3.6/7 2.96/2.2 Hourglass(HG) reduction 0.8 0.85 Lumi./IP, w/HG, 1033 cm-2s-1 3.45

Magnet Aperture: A Great Opportunity to Exploit? Cooling No Yes Kinetic energy GeV 8 Injection 50 100 210 10 injection CM energy (Electron energy) 24.7 (3 GeV) 69.6 (12 GeV) 100.6 Emittance, normalized µm 2.5 0.5 0.5 / 0.25 0.5 / 0.1 Emittance, unnorm. nm 266.9 46.1 23.2 11.1 43.0 9.2 / 4.6 4.6 / 0.93 2.2 / 0.44 Energy spread (δp/p) 10-4 3 Maximum beta in arc m 38 Maxi dispersion in arc 2.2 / 0 2.3 / 0 Max beam size in arc mm 3.9 / 3.2 2.6 / 1.3 2.4 / 0.94 2.3 / 0.65 1.4 / 1.3 0.89 / 0.42 0.78 / 0.19 0.72 / 0.13 Beam stay-clear 39 / 32 (10 σ) 26 / 13 23.9 / 9.4 24 / 6.5 8.2 / 7.7 (6 σ) 5.3 / 2.5 4.7 / 1.1 4.3 / 0.8 Magnet saggitt 18.3 Beam steering ± 5 Required phys. Aperture 106 x 74 80 x 37 76 x 29 74 x 23 46 / 25 39 / 15 38 x 12 37 / 12 42% x 34% Is a 50 mm x 30 mm aperture enough? 100 mm x 60 mm is the present baseline Can we get away with a half-size aperture for the JLEIC ion collider ring high-field dipoles so we can save half the cost? Oct. 15. 2017