The 8th international conference on particle physics and astrophysics

Using LHC real-time information for ALICE FT0 Operation during Run 3

30 Oct 2026, 12:15

15m

Conference Hall 5 ()

Oral talk Facilities and advanced detector technologies Facilities and advanced detector technologies

Description

The LHC Run 3 concluded in June 2026. Over nearly four years of operation, the ALICE experiment [1] collected $\sim$150 pb$^{-1}$ of $\text{pp}$ and $\sim$6.9 nb$^{-1}$ of the first $\text{Pb}{-}\text{Pb}$ collisions data, exceeding the cumulative dataset from previous Run 1 and Run 2. This period was also remarkable for the new
light-ion program, featuring the first $\text{Ne}{-}\text{Ne}$ and $\text{O}{-}\text{O}$ collisions at the LHC.

Two of the new ALICE detectors, Inner Tracking System (ITS) and FT0 – a Cherenkov
detector within the Fast Interaction Trigger (FIT) [2] system – have become essential for data taking. Both are widely used for event selection, particularly based on the vertex position in recent Run 3 analysis. Moreover, the FT0 data is a source for multiplicity classification in $\text{pp}$ collisions and centrality classification in various ion collision systems. In addition, the FT0 serves as the primary ALICE luminometer in pp collisions and the machine background intensity estimator for the ALICE experiment. These capabilities of the FT0 detector are enabled by the high performance of the front-end electronics and its integration with the FIT Detector Control System (DCS) [3], which allows for the correction of trigger counts based on the LHC filling scheme.

This talk is devoted to the integration of the LHC interface signals with FT0 DCS. This connection enabled the Run 3 instantaneous luminosity measurement, online background estimator and other automated algorithms, ultimately contributing to the excellent performance of the FT0.

References

1. ALICE upgrades during the LHC Long Shutdown 2 / S. Acharya [et al.] // Journal of instrumentation.
   – 2024. – Vol. 19, no. 05. – P05062. doi: https://doi.org/ 10.1088/1748-0221/19/05/P05062
2. Slupecki M. Fast Interaction Trigger for ALICE upgrade //Nuclear Instruments and Methods in Physics
   Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. – 2022. – Vol.1039. – P.167021. doi: https://doi.org/10.1016/j.nima.2022.167021
3. ALICE fast interaction trigger detector control system for the LHC Run 3 // M. Sukhanov [et al.] //
   International Journal of Modern Physics E. – 2026. – Vol. 35. – P.2641008. doi: https://doi.org/10.1142/S0218301326410089

Presentation Materials

Using_LHC_real_time_information_for_ALICE_FT0_Operation_during_Run.pdf