1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Analysis of machine induced background to ALICE in the 2023 LHC ion run

MOPS138
2 Jun 2025, 16:00
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC1.A26 Machine Detector Interface Monday Poster Session

Speaker

Volodymyr Rodin (European Organization for Nuclear Research)

Description

During the 2023 ion run at the LHC, where crystal collimation was regularly adopted for the first time, strong background levels were observed at the Inner Tracking System (ITS) of the ALICE detector. Some of the readout chips became saturated, causing losses of angular acceptance. This background was mitigated with using a dispersion knob in the beam optics, letting some residual background remain. Considering that the next upgrade of ALICE ITS foresees a reduction of the interaction chamber aperture, understanding the mechanisms leading to this background appears critical to envision appropriated mitigation solutions. Preliminary studies showed that this background was related to losses at the upstream tertiary collimator (TCT), impacted by 207Pb ions issued from beam interaction with the crystals of the primary collimation stage. Based on FLUKA simulations, this paper investigates the propagation of the tertiary collimation showers towards the ALICE cavern.

Region represented Europe
Paper preparation format LaTeX

Author

Helene Guerin (European Organization for Nuclear Research)

Co-authors

Anton Lechner (European Organization for Nuclear Research) Francesco Cerutti (European Organization for Nuclear Research) Luigi Salvatore Esposito (European Organization for Nuclear Research) Roderik Bruce (European Organization for Nuclear Research) Rongrong Cai (European Organization for Nuclear Research) Volodymyr Rodin (European Organization for Nuclear Research)

Presentation materials

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