A re-commissioning year - normal cavaets particularly apply. Estimates based on 2012's Hubner factor and the indicated physics efficiency. Total consistent with the stated target for the year of 10 fb-1.
| Phase |
Days |
Physics efficiency |
Integrated luminosity |
|
| Initial low luminosity run |
7 |
20% |
few pb-1 |
low number of bunches |
| 50 ns intensity ramp-up |
14 from 21 |
20% |
0.1 fb-1 |
short fills plus issues: QPS, UFOs, MCS |
| 25 ns phase beta*=80 cm |
65 |
30% |
4 fb-1 |
includes ramp-up and bedding in of 25 ns, beta* might be lowered (65 cm say) later in the run depending on stability, aperture etc. Issues with TDI limit number of injected bunches |
Assumed parameters
| Parameter |
50 ns |
25 ns phase 1 |
25 ns phase 2 - supressed following delays -not fully ruled out |
| Energy [TeV] |
6.5 |
6.5 |
6.5 |
| β* (1/2/5/8) [m] |
0.8 / 10 / 0.8 / 3 |
0.8 / 10 / 0.8 / 3 |
0.4 / 10 / 0.4 / 3 |
| Half X-angle (1/2/5/8) [μrad] |
-145 / 120 / 145 / -250 |
-145 / 120 / 145 / -250 |
-155 / 120 / 155 / -150 |
| Number of colliding bunches (1/5) |
1368 |
2376 (not likely given TDI limitations - scale accordingly) |
2448 |
| Bunch population |
1.2e11 |
1.2e11 |
1.1e11 |
| Emittance into Stable Beams [μm] |
2.5 |
3.5 |
2.5 |
| Bunch length [ns] - 4 sigma |
1.25 |
1.25 |
1.25 |
| Peak Luminosity |
4.8e33 |
6.3e33 |
1.2e34 |
| Peak mean pile-up (inelastic xsection 80 mb) |
25 |
21 |
34 |
- Number of bunches injected limited BCMS (144)
- 80 mb inelastic cross section at 6.5 TeV
Updated August 2015
ML
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