This website is no longer maintained. Its content may be obsolete. Please visit http://home.cern for current CERN information.
Bunch Spacing
|
Charges per bunch
|
Bunches per batch
|
|
Pilot
|
25 ns
|
5 x 10^9
|
1
|
Intermediate
|
25 ns
|
3.4 x 10^10
|
72
|
Intermediate
|
75 ns
|
8.3 x 10^10
|
24
|
Commissioning
|
25 ns
|
1.8 to 2.75 x 10^10
|
216/288
|
Nominal
|
25 ns
|
1.1 x 10^11
|
216/288
|
Ultimate
|
25 ns
|
1.8 x 10^11
|
216/288
|
Nominal Lead
|
125 ns
|
5.6 x 10^9
|
608 per beam
|
Machine Studies
|
|||
Totem
|
1.1 x 10^11
|
36
|
Pilot beam parameters (JJG - LCC)
Commissioning proton beam parameters (FR at LCC)
Detailed breakdown provided by Oliver in Seminar on the 19th September 2001.
Nominal emittance 3.75 mm Commissioning emittance 1.0 mm
Injection: bmax in arcs = 183 m, Dmax in arc 2.15 m, bmax in IRs = 380 m
Commissioning
|
Nominal Injection |
Nominal high energy
|
|
e = 7.8 nm b = 180 m -> s = 1.2 mm g = 479.7 |
|||
Momentum spread
|
|||
Momentum deviation
|
Dp/p< 10^-4
|
||
Beta beating
|
21%
|
25%
|
|
Orbit RMS
|
< 4mm
|
< 3mm
|
|
Orbit peak
|
< 0.4 s in arcs
< 0.2 s in IPs < 0.15 s (30 mm) in cleaning insertions |
|
|
Chromaticy
|
< 10
|
+/- 1 unit
|
+/- 1 unit
|
Mechanical aperture
|
orbit + beat + alignment (2.5 mm) 8.5s in arc |
||
Tune
|
DQ < +/- 0.015
|
DQ < +/- 0.005
|
Nq at 450 GeV 7 x 10^8 p/m/s (protons/metre/second) which is 2.2 10^-6 % of the nominal beam.