New Journal of Physics (Jan 2021)

Single particle detection system for strong-field QED experiments

  • F C Salgado,
  • N Cavanagh,
  • M Tamburini,
  • D W Storey,
  • R Beyer,
  • P H Bucksbaum,
  • Z Chen,
  • A Di Piazza,
  • E Gerstmayr,
  • Harsh,
  • E Isele,
  • A R Junghans,
  • C H Keitel,
  • S Kuschel,
  • C F Nielsen,
  • D A Reis,
  • C Roedel,
  • G Sarri,
  • A Seidel,
  • C Schneider,
  • U I Uggerhøj,
  • J Wulff,
  • V Yakimenko,
  • C Zepter,
  • S Meuren,
  • M Zepf

DOI
https://doi.org/10.1088/1367-2630/ac4283
Journal volume & issue
Vol. 24, no. 1
p. 015002

Abstract

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Measuring signatures of strong-field quantum electrodynamics (SF-QED) processes in an intense laser field is an experimental challenge: it requires detectors to be highly sensitive to single electrons and positrons in the presence of the typically very strong x-ray and γ -photon background levels. In this paper, we describe a particle detector capable of diagnosing single leptons from SF-QED interactions and discuss the background level simulations for the upcoming Experiment-320 at FACET-II (SLAC National Accelerator Laboratory). The single particle detection system described here combines pixelated scintillation LYSO screens and a Cherenkov calorimeter. We detail the performance of the system using simulations and a calibration of the Cherenkov detector at the ELBE accelerator. Single 3 GeV leptons are expected to produce approximately 537 detectable photons in a single calorimeter channel. This signal is compared to Monte-Carlo simulations of the experiment. A signal-to-noise ratio of 18 in a single Cherenkov calorimeter detector is expected and a spectral resolution of 2% is achieved using the pixelated LYSO screens.

Keywords