Update beam_parameters for 2023 PbPb from ion data-taking in October 2023
We have prepared an "expected-2023" PbPb beamfile before (!203 (merged)), now the beam parameters are updated from this slides, listed as follows:
- filling scheme: 1240b with 398 colliding at IP8 (actually there are several filling schemes listed here)
- bunch intensity: 1.8 x 108 Pb ions
- beam energy: 6.8 TeV
- instantaneous lumi: 1.1 x 1027 cm-2 s-1, mu = 0.001 (no levelling)
- β*: 1.5 m
- half crossing angle: horizontal, -139 (internal) - 135 (external) = -274 μrad
- polarity: +/DOWN
The PVs are measured by @samarian , with Run Number 278788, in Fill 9237
- PVX = 1.143 mm
- PVY = 0.649 mm
- PVZ = 5.535 mm
- \sigma_{PVX} = 0.0274 mm
- \sigma_{PVY} = 0.0278 mm
- \sigma_{PVZ} = 46.89 mm
