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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

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

Author

  • J. Alme
  • P. Christiansen
  • O. Matonoha
  • A. Nassirpour
  • A. Oskarsson
  • A. Önnerstad
  • L. Österman
  • D. Silvermyr
  • O. Vazquez Rueda
  • S. Winkler

Summary, in English

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.

Department/s

  • Particle and nuclear physics

Publishing year

2023

Language

English

Publication/Series

Journal of Instrumentation

Volume

18

Issue

11

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Accelerator Physics and Instrumentation

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1748-0221