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

2. MEIC Schematic Layout

3. 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) ≤ for ion
Round ion beams due to low energy 3

4. IP
e-Cooler