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Deep diffused Avalanche photodiodes for charged particles timing

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • M. Centis Vignali
  • P. Dias De Almeida
  • L. Franconi
  • M. Gallinaro
  • Y. Gurimskaya
  • B. Harrop
  • W. Holmkvist
  • C. Lu
  • I. Mateu
  • M. McClish
  • K.T. McDonald
  • M. Moll
  • F.M. Newcomer
  • S. Otero Ugobono
  • S. White
  • M. Wiehe
Article number162405
<mark>Journal publication date</mark>1/04/2020
<mark>Journal</mark>Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Number of pages5
Publication StatusPublished
Early online date19/07/19
<mark>Original language</mark>English


The upgrades of ATLAS and CMS for the High Luminosity LHC (HL-LHC) highlighted physics objects timing as a tool to resolve primary interactions within a bunch crossing. Since the expected pile-up is around 200, with an r.m.s. time spread of 180ps, a time resolution of about 30ps is needed. The timing detectors will experience a 1-MeV neutron equivalent fluence of about Φ eq=10 14 and 10 15cm −2 for the barrel and end-cap regions, respectively. In this contribution, deep diffused Avalanche Photo Diodes (APDs) produced by Radiation Monitoring Devices are examined as candidate timing detectors for HL-LHC applications. To improve the detector's timing performance, the APDs are used to directly detect the traversing particles, without a radiator medium where light is produced. Devices with an active area of 8 × 8mm 2 were characterized in beam tests. The timing performance and signal properties were measured as a function of position on the detector using a beam telescope and a microchannel plate photomultiplier (MCP-PMT). Devices with an active area of 2 × 2mm 2 were used to determine the effects of radiation damage and characterized using a ps pulsed laser. These detectors were irradiated with neutrons up to Φ eq=10 15cm −2.