Configuration for the 2026 Special Run at Low Energy
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Configuration for the 2026 Special Run at Low Energy |
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Below are the expected machine parameters prior to the actual run.
| General beam properties | ||
|---|---|---|
| Beam energy | 1.2 ZTeV | |
| CoM energy | 2.4 TeV | |
| Beam 1 | Protons | |
| Beam 2 | Protons | |
| 75b filling scheme | 25ns_75b_74_38_50_12bpi_9inj_3INDIVs | |
| 400b filling scheme | 25ns_444b_401_364_432_72bpi_9inj_800ns_bs200ns | Expected performance (please check configuration! small updates might have happened) |
| 800b filling scheme | 25ns_840b_783_680_792_144bpi_9inj_800ns_bs200ns | Expected performance (please check configuration! small updates might have happened) |
| 1200b filling scheme | 25ns_1164b_1081_980_1152_144bpi_13inj_800ns_bs200ns | Expected performance (please check configuration! small updates might have happened) |
| Proton bunch intensity | ∼ 1.8 x 1011 protons per bunch | |
| Proton beam emittance | 1.8 µm (both in H and V) | Assumed from discussions and simulations with and by the machine experts. |
| Proton beam emittance growth | ∼ 0.5 (H) / ∼ 0.1 (V) µm / h | |
| Hadronic cross-section | 60 mb | Interpolated from arXiv:1712.06153 [hep-ex]. |
| IP1 (ATLAS) | ||
| β* | 11 m | |
| Half crossing angle | +170 µrad (V) | |
| Leveling value (pile-up) | µ = 0.05 (75b), 0.5 (later) | |
| Peak pile-up | µ ∼ 1 | This is if head-on at the start of the fill. |
| IP5 (CMS) | ||
| β* | 11 m | |
| Half crossing angle | +170 µrad (H) | |
| Leveling value (pile-up) | No leveling | |
| Peak pile-up | µ ∼ 1 | This is when head-on at the start of the fill. |
| IP2 (ALICE) | ||
| β* | 10 m | |
| Dipole polarity | - / - | |
| External crossing angle | +170 µrad | |
| Internal crossing angle | +408 µrad | |
| Total half crossing angle | +578 µrad | |
| Leveling value (pile-up) | To be communicated | |
| Peak pile-up | µ ∼ 1.07 | This is if head-on at the start of the fill. |
| IP8 (LHCb) | ||
| β* | 3.1 m | |
| Dipole polarity | Down, positive | No change during the run |
| External half crossing angle | -150 µrad | |
| Internal half crossing angle | -788 µrad | |
| Half crossing angle | -938 µrad | |
| Leveling value (pile-up) | No leveling | |
| Peak pile-up | µ ∼ 2.2 | This is when head-on at the start of the fill. |