Particle Physics Booklet - Particle Data Group - Lawrence Berkeley ...

HIGH-ENERGY COLLIDER PARAMETERS: e + e− Colliders (II)
Updated in early 2010 (contact J. Beringer, LBNL). For existing (future) colliders the latest achieved (design) values are given. Quantities are, where appropriate, r.m.s.;
H and V indicate horizontal and vertical directions; s.c. stands for superconducting.
ILC
(TBD)
SuperKEKB
(KEK)
SuperB
(Italy)
PEP-II
(SLAC)
KEKB
(KEK)
Physics start date 1999 1999 TBD 2014? TBD
Physics end date — 2008 — — —
e− : 7–12 (9.0 nominal)
250
Maximum beam energy (GeV) e− :8.33 (8.0 nominal)
e + e
:3.64 (3.5 nominal)
+ : 2.5–4 (3.1 nominal)
e
(nominal Ecm =10.5 GeV)
− :4.2
e + e
:6.7
− :7
e + (upgrade-
:4
able to 500)
26. High-energy collider parameters 227
Luminosity (1030 cm−2s−1 ) 21083 12069
1.0 × 10
(design: 3000)
6 8 × 105 2 × 104 Time between collisions (μs) 0.00590 or 0.00786 0.0042 0.0042 0.004 0.3 ‡
Energy spread (units 10−3 )
0.7 e− /e + : 0.61/0.77 e− /e + : 0.73/0.64 e− /e + : 0.58/0.84 1
Bunch length (cm) 0.65 e− /e + : 1.1/1.0 0.5 e− /e + : 0.5/0.6 0.03
Beam radius (μm)
H :124(e− ), 117 (e + )
H :157
H :8
e
V :0.94
V :4.7
V :0.04
− : 11(H), 0.062(V )
e + H :0.639
: 10(H), 0.048(V ) V :0.0057
Free space at interaction
+0.75/−0.58
±0.2,
±0.35
e
point (m)
(+300/−500) mrad cone ±300 mrad cone
− :+1.20/ − 1.28,e + :+0.78/ − 0.73
±3.5
(+300/-500) mrad cone)
β∗ , amplitude function at e
interaction point (m)
− : 1.2 (0.27*)(H), 0.0059 (V )
e + e
: 1.2 (0.23*)(H), 0.0059 (V )
− :0.50(H), 0.012 (V )
e + e
:0.50(H), 0.012 (V )
− :0.032(H), 0.00021(V )
e + e
:0.026(H), 0.00025(V )
− :0.025(H), 3 × 10−4 (V )
e + :0.032(H), 2.7 × 10−4 H :0.02
(V ) V :0.0004
Interaction regions 1 1 1 1 1
‡ Time between bunch trains: 200ms.
∗ With dynamic beam-beam effect.