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Correction of the baseline fluctuations in the GEM-based ALICE TPC

Alme, J. ; Christiansen, P. LU ; Matonoha, O. LU ; Nassirpour, A. LU orcid ; Oskarsson, A. LU ; Önnerstad, A. ; Österman, L. LU ; Silvermyr, D. LU orcid ; Vazquez Rueda, O. LU and Winkler, S. (2023) In Journal of Instrumentation 18(11).
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... (More)
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. (Less)
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published
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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
in
Journal of Instrumentation
volume
18
issue
11
article number
P11021
publisher
IOP Publishing
external identifiers
  • scopus:85179176730
ISSN
1748-0221
DOI
10.1088/1748-0221/18/11/P11021
language
English
LU publication?
yes
id
91c10f3b-953f-4f06-8d1a-e970e0e3a3a6
date added to LUP
2024-01-17 09:11:58
date last changed
2024-01-17 09:14:11
@article{91c10f3b-953f-4f06-8d1a-e970e0e3a3a6,
  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.}},
  author       = {{Alme, J. and Christiansen, P. and Matonoha, O. and Nassirpour, A. and Oskarsson, A. and Önnerstad, A. and Österman, L. and Silvermyr, D. and Vazquez Rueda, O. and Winkler, S.}},
  issn         = {{1748-0221}},
  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}},
  language     = {{eng}},
  number       = {{11}},
  publisher    = {{IOP Publishing}},
  series       = {{Journal of Instrumentation}},
  title        = {{Correction of the baseline fluctuations in the GEM-based ALICE TPC}},
  url          = {{http://dx.doi.org/10.1088/1748-0221/18/11/P11021}},
  doi          = {{10.1088/1748-0221/18/11/P11021}},
  volume       = {{18}},
  year         = {{2023}},
}