Abstract
To operate the ALICE Time Projection Chamber in continuous mode during the Run 3 and Run 4 data-taking periods of the Large Hadron Collider, the multi-wire proportional chamber-based readout was replaced with gas-electron multipliers. As expected, the detector performance is affected by the so-called common-mode effect, which leads to significant baseline fluctuations. A detailed study of the pulse shape with the new readout has revealed that it is also affected by ion tails. Since reconstruction and data compression are performed fully online, these effects must be corrected at the hardware level in the FPGA-based common readout units. The characteristics of the common-mode effect and of the ion tail, as well as the algorithms developed for their online correction, are described in this paper. The common-mode dependencies are studied using machine-learning techniques. Toy Monte Carlo simulations are performed to illustrate the importance of online corrections and to investigate the performance of the developed algorithms. © 2023 CERN for the benefit of the Alice collaboration.
Original language | English |
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Article number | P11021 |
Journal | Journal of Instrumentation |
Volume | 18 |
Issue number | 11 |
DOIs | |
Publication status | Published - 2023 |
Subject classification (UKÄ)
- Accelerator Physics and Instrumentation
Free keywords
- Charge transport and multiplication in gas
- Electron multipliers (gas)
- Micropattern gaseous detectors (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, InGrid, etc)
- Time projection Chambers (TPC)
- Intelligent systems
- Learning systems
- Monte Carlo methods
- Baseline fluctuations
- Commonmode
- Electron multiplier (gas)
- Gaseous detectors
- Micro pattern
- Micromegas
- Micropattern gaseous detector (MSGC, GEM, THGEM, RETHGEM, MHSP, MICROPIC, MICROMEGAS, ingrid, etc)
- Time projection chamber
- Time projection chambers
- Electron multipliers