Intensity ramp-up in 2025
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Intensity ramp-up in 2025 |
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The following AGK is assumed: 32781
| Scheme | Gitlab | Remarks |
|---|---|---|
| Single_4b_2_2_2_noLRs | Download (link to be added) | 4b with two colliding at each IP, no long range collisions -- this is the 3b step |
| Single_12b_8_8_8_1bpi_12inj | Download (link to be added) | 12b with 8 colliding at each IP |
| 25ns_75b_74_38_50_12bpi_9inj_3INDIVs | Download (link to be added) | 75b step with 12 bunch trains and 3 INDIVs (2 collisions per IP) |
| 25ns_447b_434_380_398_36bpi_16inj_3INDIVs | Download (link to be added) | 400b step with 1x36 bunch trains (1st fill) and 3 INDIVs (2 collisions per IP). 12 non-colliding bunches. |
| 25ns_447b_434_382_403_72bpi_12inj_3INDIVs | Download (link to be added) | 400b step with 2x36 bunch trains (later fills) and 3 INDIVs (2 collisions per IP) 12 non-colliding bunches. |
| 25ns_843b_830_702_744_72bpi_16inj_3INDIVs | Download (link to be added) | 800b step with 2x36 bunch trains (1st fill) and 3 INDIVs (2 collisions per IP) 12 non-colliding bunches. |
| 25ns_843b_830_704_749_144bpi_12inj_3INDIVs | Download (link to be added) | 800b step with 4x36 bunch trains (later fills) and 3 INDIVs (2 collisions per IP) 12 non-colliding bunches. |
| 25ns_1167b_1154_1020_1083_144bpi_16inj_3INDIVs | Download (link to be added) | 1200b step with 4x36 bunch trains and 3 INDIVs (2 collisions per IP) 12 non-colliding bunches. |
| 25ns_1887b_1874_1658_1763_144bpi_20inj_3INDIVs | Download (link to be added) | 1800b step with 4x36 bunch trains and 3 INDIVs (2 collisions per IP) 12 non-colliding bunches. |
| 25ns_2390b_2377_2045_2180_144bpi_22inj_2INDIVs | Download (link to be added) | 2400b step with 4x36 bunch trains and 2 INDIVs (1 collision per IP) 12 non-colliding bunches. 3x36b train for steering, assumes no steering issues. |
| 25ns_2460b_2448_2089_2227_144bpi_20inj | Download (link to be added) | Full machine with 4x36 bunch trains and 0 INDIVs, 0 non-colliding bunches. 3x36b train for steering, assumes no steering issues. |
To be discussed -- very preliminary first suggestion.
Activities agreed with experiments. Only activities affecting the LHC or other experiments are listed.
| Step | ATLAS | CMS | LHCb | ALICE |
|---|---|---|---|---|
| 4b/12b | ||||
| 1st 75b | ||||
| 2nd 75b | Low μ (μ∼1 for 2h, μ∼0.1 for 2h) | Solonoid and Dipole OFF | ||
| 1st 400b | Low μ (μ∼0.05) separated before stable beams (∼2h) | |||
| 2nd 400b | Magnet off - as short a fill as possible | |||
| 1st 800b | Higher rate for readout commissioning - postponed** | |||
| 2nd 800b | Low solonoid field and higher rate - postponed** |
* 15-point emittance scans at IP1/5 at the start and end of every fill from 1200b. IP2 and IP8 on request. Prior to this step various emittance scans are requested by experiments/machine.
** Problem with stability at high rate had to be studied prior to these tests to they were postponed to a later step.
Note that there will be the calibration transfer fills with INDIVs and with trains between the ramp-up steps. These fills are described on the VdM Special Runs page. The first of these is between the 4b and 75b step, and the second is after the 1200b step before going to the full machine.
| Step | ATLAS | CMS | LHCb | ALICE | Filling scheme | Notes |
|---|---|---|---|---|---|---|
| 4b step | Separation leveling of μ∼5-10 | High μ | Multi_3b_1_2_2_1bpi_3inj_800ns_Afterglow | This fill is the CMS afterglow request. Step through β* quickly. ∼4-6h | ||
| 75b step | 25ns_75b_74_38_50_12bpi_9inj_3INDIVs | This fill will be after the Calibration Transfer fill with INDIVs. Full β* and x-angle leveling. ∼8h | ||||
| 400b step | Short μ scan | 25ns_447b_434_382_403_72bpi_12inj_3INDIVs | Full β* and x-angle leveling. ∼8h | |||
| 1200b step | High lumi test after end of β* leveling. OFB with high gain. | 25ns_1167b_1154_1020_1083_144bpi_16inj_3INDIVs | Full β* and x-angle leveling. ∼8h. Following this fill there is the Calibration Transfer fill with trains before the full machine. |