Configuration for the 2025 Special Runs: Proton-Oxygen, Oxygen-Oxygen, Neon-Neon and VdM scans
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Configuration for the 2025 Special Runs: Proton-Oxygen, Oxygen-Oxygen, Neon-Neon and VdM scans |
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This document is work in progress and is being updated as information is collected and decisions are made.
| General beam properties | ||
|---|---|---|
| Beam energy | 6.8 ZTeV | |
| Nucleon-nucleon CoM energy | 9.62 TeV | |
| Beam 1 | Protons | |
| Beam 2 | Oxygen ions | |
| Max number of bunches per beam | 48 | Multi_48b_32_32_32_4bpi_12inj_800ns_bs1000ns is possible. Exact scheme to be defined/discussed. |
| Minimum Bunch spacing | 1 µs | Injections widely spaced to aid ATLAS IBL veto. |
| Proton bunch intensity | 1 x 1010 protons per bunch | |
| Ion bunch intensity | 1 x 1010 charges per bunch | |
| Proton beam emittance | 2.0 µm | Assumed from 2024 operation. |
| Ion beam emittance | 2.1 µm | Large uncertainty on this. |
| Hadronic cross-section | 0.45 barns | |
| IP1 (ATLAS/LHCf) | ||
| β* | 1 m | |
| Half crossing angle | -145 µrad | V (negative) is optimal for LHCf |
| Leveling value (pile-up) | µ = 0.01-0.03 | 8h at 0.01 then 0.03 |
| IP5 (CMS) | ||
| β* | 1 m | |
| Half crossing angle | 0 µrad | Plane is undefined but H (positive) |
| Leveling value (pile-up) | No leveling | |
| Peak pile-up | µ ∼ 0.1 | |
| IP2 (ALICE) | ||
| β* | 1 m | |
| Dipole polarity | + / + | No change during the run |
| External crossing angle | + 72 µrad | |
| Internal crossing angle | - 72 µrad | |
| Total half crossing angle | 0 µrad | |
| Leveling value (pile-up) | No leveling | |
| Peak pile-up | µ ∼ 0.1 | |
| IP8 (LHCb) | ||
| β* | 1.5m | |
| Dipole polarity | negative | No change during the run |
| External half crossing angle | -139 µrad | |
| Internal half crossing angle | + 139 µrad | |
| Half crossing angle | 0 µrad | |
| Leveling value (pile-up) | No leveling | |
| Peak pile-up | µ ∼ 0.07 | |
This assumes a squeeze for this energy is commissioned and that the lower center-of-mass energy is prefered.
| General beam properties | ||
|---|---|---|
| Beam energy | 5.36 ZTeV | |
| Nucleon-nucleon CoM energy | 5.36 TeV | |
| Beam 1 | Oxygen ions | |
| Beam 2 | Oxygen ions | |
| Max number of bunches per beam | 18 | Multi_18b_12_12_12_1bpi_18inj_800ns is possible. Exact scheme to be defined/discussed. |
| Minimum Bunch spacing | Batches widely spaced to aid ATLAS IBL veto. | Injections of single bunches. |
| Bunch intensity | 3 x 1010 charges per bunch | |
| Beam emittance | 2.1 µm | Large uncertainty on this. |
| Hadronic cross-section | 1.30 barns | |
| IP1 (ATLAS) | ||
| β* | 0.5 m | |
| Half crossing angle | 0 µrad | Plane is undefined but V (positive) |
| Leveling value (pile-up) | No leveling | |
| Peak pile-up | µ ∼ 0.33 | |
| IP5 (CMS) | ||
| β* | 0.5 m | |
| Half crossing angle | 0 µrad | Plane is undefined but H (positive) |
| Leveling value (pile-up) | No leveling | |
| Peak pile-up | µ ∼ 0.33 | |
| IP2 (ALICE) | ||
| β* | 0.5 m | |
| Dipole polarity | + / + | No change during the run |
| External crossing angle | + 91 µrad | Adjusted for lower beam energy |
| Internal crossing angle | - 91 µrad | Adjusted for lower beam energy |
| Total half crossing angle | 0 µrad | |
| Leveling value (pile-up) | µ = 0.2 | |
| IP8 (LHCb) | ||
| β* | 1 m | |
| Dipole polarity | negative | No change during the run |
| External half crossing angle | -176 µrad | Adjusted for lower beam energy |
| Internal half crossing angle | + 176 µrad | Adjusted for lower beam energy |
| Half crossing angle | 0 µrad | |
| Leveling value (pile-up) | No leveling | |
| Peak pile-up | µ ∼ 0.17 | |
The Neon-Neon run will follow closely the Oxygen-Oxygen configuration but the emittance may be different and intensity per bunch might be limited by the injectors/source. These will be better known after the tests towards the end of May.
| General beam properties | ||
|---|---|---|
| Beam energy | 5.36 ZTeV | |
| Nucleon-nucleon CoM energy | 5.36 TeV | |
| Beam 1 | Neon ions | |
| Beam 2 | Neon ions | |
| Max number of bunches per beam | 18 | Multi_18b_12_12_12_1bpi_18inj_800ns is possible. Exact scheme to be defined/discussed. |
| Minimum Bunch spacing | Batches widely spaced to aid ATLAS IBL veto. | Injections of single bunches. |
| Bunch intensity | 3 x 1010 charges per bunch | This might be limited by the injector chain / source. |
| Beam emittance | 2.1 µm | Large uncertainty on this. |
| Hadronic cross-section | ??? barns | To be determined |