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Title: Testbeam results of irradiated ams H18 HV-CMOS pixel sensor prototypes

HV-CMOS pixel sensors are a promising option for the tracker upgrade of the ATLAS experiment at the LHC, as well as for other future tracking applications in which large areas are to be instrumented with radiation-tolerant silicon pixel sensors. We present results of testbeam characterisations of the 4 th generation of Capacitively Coupled Pixel Detectors (CCPDv4) produced with the ams H18 HV-CMOS process that have been irradiated with different particles (reactor neutrons and 18 MeV protons) to fluences between 1×10 14 and 5×10 15 1–MeV– n eq. The sensors were glued to ATLAS FE-I4 pixel readout chips and measured at the CERN SPS H8 beamline using the FE-I4 beam telescope. Results for all fluences are very encouraging with all hit efficiencies being better than 97% for bias voltages of 85 V. The sample irradiated to a fluence of 1×10 15 neq—a relevant value for a large volume of the upgraded tracker—exhibited 99.7% average hit efficiency. Furthermore, the results give strong evidence for the radiation tolerance of HV-CMOS sensors and their suitability as sensors for the experimental HL-LHC upgrades and future large-area silicon-based tracking detectors in high-radiation environments.
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  1. Univ. of Geneva, Geneve 4 (Switzerland)
  2. Univ. of Bern, Bern (Switzerland)
  3. Univ. of Liverpool, Liverpool (United Kingdom)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States); Univ. of Science and Technology of China, Anhui (China)
  6. Univ. of Geneva, Geneve 4 (Switzerland); Univ. of Liverpool, Liverpool (United Kingdom)
  7. Lancaster Univ., Lancaster (United Kingdom)
  8. Univ. of Geneva, Geneve 4 (Switzerland); European Organization for Nuclear Research (CERN), Geneva (Switzerland)
  9. Univ. of Tsukuba, Ibaraki (Japan)
  10. Karlsruher Institut fur Technologie (KIT), Karlsruhe (Germany)
Publication Date:
Report Number(s):
Journal ID: ISSN 1748-0221
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 13; Journal Issue: 02; Journal ID: ISSN 1748-0221
Institute of Physics (IOP)
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Solid state detectors; Radiation-hard detectors; Particle tracking detectors; Electronic detector readout concepts (solid-state)
OSTI Identifier: