Configuration for the 2023 lead-lead run LPC home

Disclamer

The data in this table has been compiled in collaboration with the HI machine experts. This document is work in progress and will be updated whenever needed or useful.

Heavy Ion configuration and setup

• Intensity ramp-up requested by MPP
  • Intitial cycle performed with low intensity (filling schemes to be finalized).
    • 80b  : 1 fill; 2h Stable Beams
    • 250b  : 2 fills; more than  5h in Stable Beams 
    • 450b  : 2 fills; more than  5h in Stable Beams 
    • Check list needed to be completed before going to higher number of bunches
    • 850b  : 2 fills; more than  5h in Stable Beams 
    • 1240b  (full machine): corresponding to ~20 MJ of stored energy
  • ALICE will perform a polarity change roughly half way through the run. After the polarity change, MPP requires one cycle with low intensity followed by one fill of 450b and more than 2h  in Stable Beams .
• VdM scans will be done with 100ns bunch spacing; filling scheme to be finalized.
• The ion run is expected to be done with 50ns bunch spacing, with slip stacking injection configuration. As a backup option, 75ns or 100ns scheme will be provided

LHC configuration

VdM scans

The VdM scans need to be done in the 100ns configuration. They will be done with regular physics optics and using a physics filling scheme.

After discussions in defining the filling scheme for the VdM scans, two filling schemes have been prepared.

Filling scheme optimised for IP2/8:

100ns_432b_204_324_301_28bpi_27inj_VdMPbPb.csv

Filling scheme optimised for IP1/5:

100ns_432b_374_250_181_28bpi_27inj_VdMPbPb.csv

Filling scheme equalized to all IPs (backup):

100ns_432b_290_264_256_28bpi_27inj_VdMPbPb.csv

Filling schemes

The following AGKs can be assumed: TBC

Two filling schemes per intensity step are provided: the first for the 50ns slip stack solution, the second with 100ns separation in case the 50ns slip stack would not eb ready in time.

pp reference run configuration and setup

• The pp reference run for the year 2023 has been postponed to (early) 2024 due to the limitations imposed by the leaks on the TDI8
• Intensity ramp-up requested by MPP
  • Intitial cycle performed with low intensity: 3b with SB declared and AFP inserted, followed by 12b, one fill with least 2h in SB.
    • 75b  : 1 fill; 2h Stable Beams
    • 400b  : 1 fill; more than  5h in Stable Beams 
    • 900b  : 1 fill; more than  5h in Stable Beams 
    • 1200b  : 1 fill; more than  5h in Stable Beams 
    • 1800b  : 1 fill; more than  5h in Stable Beams 
    • 2400b  : full machine and checklist
  • ALICE will perform a polarity change roughly half way through the run. After the polarity change, no MPP requirements
• VdM scans will be done with 100ns bunch spacing; filling scheme to be finalized.
• The ion run is expected to be done with 50ns bunch spacing, with slip stacking injection configuration. As a backup option, 75ns or 100ns scheme will be provided

LHC configuration

VdM scans

The VdM scans need to be done with physics optics but VdM beams (INDIVs, low bunch intensity and large emittance). It should last about 16h, with 4h per experiments roughly.

The proposed filling scheme for the pp reference run:

525ns_122b_120_48_40_8bpi_17inj_bs800ns_VdMppref.csv

Filling schemes

The following AGKs can be assumed: 32781