CERN

Intensity ramp-up in 2025

LPC home

LPC: 79977

 

General remarks

 

Filling schemes leading to 4x36 bpi

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.

 

Experiment activities during intensity ramp-up (beginning of the year)

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.

 

Experiment activities during post-TS1 intensity ramp-up

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.

 

 

This web site is owned by the account lpc .