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Peter Christiansen Profile

Peter Christiansen

Professor

Peter Christiansen Profile

Particle identification studies with a full-size 4-GEM prototype for the ALICE TPC upgrade

Author

  • M.M Aggarwal
  • Z Ahammed
  • S Aiola
  • J Alme
  • T Alt
  • W. Amend
  • Peter Christiansen
  • Martin Ljunggren
  • Anders Oskarsson
  • Tuva Richert
  • David Silvermyr
  • Evert Stenlund
  • Vytautas Vislavicius
Show all

Summary, in English

A large Time Projection Chamber is the main device for tracking and charged-particle identification in the ALICE experiment at the CERN LHC. After the second long shutdown in 2019/20, the LHC will deliver Pb beams colliding at an interaction rate of about 50 kHz, which is about a factor of 50 above the present readout rate of the TPC. This will result in a significant improvement on the sensitivity to rare probes that are considered key observables to characterize the QCD matter created in such collisions. In order to make full use of this luminosity, the currently used gated Multi-Wire Proportional Chambers will be replaced. The upgrade relies on continuously operated readout detectors employing Gas Electron Multiplier technology to retain the performance in terms of particle identification via the measurement of the specific energy loss by ionization dE/dx. A full-size readout chamber prototype was assembled in 2014 featuring a stack of four GEM foils as an amplification stage. The performance of the prototype was evaluated in a test beam campaign at the CERN PS. The dE/dx resolution complies with both the performance of the currently operated MWPC-based readout chambers and the challenging requirements of the ALICE TPC upgrade program. Detailed simulations of the readout system are able to reproduce the data. © 2018 Elsevier B.V.

Department/s

  • eSSENCE: The e-Science Collaboration
  • Particle and nuclear physics

Publishing year

2018

Language

English

Pages

215-223

Publication/Series

Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Volume

903

Document type

Journal article

Publisher

Elsevier

Topic

  • Subatomic Physics

Keywords

  • ALICE
  • Gas Electron Multiplier
  • Particle identification
  • Specific energy loss
  • Time Projection Chamber
  • Charged particles
  • Energy dissipation
  • Ionization chambers
  • Ionization of gases
  • Readout systems
  • Gas electron multipliers
  • Particle identifications
  • Specific energy
  • Time projection chambers
  • Electron multipliers

Status

Published

ISBN/ISSN/Other

  • ISSN: 0167-5087