Radiation effects at the LHC experiments and impact on operation and performance

Europe/Zurich
6/2-024 - BE Auditorium Meyrin (CERN)

6/2-024 - BE Auditorium Meyrin

CERN

114
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Description

With focus on radiation effects in inner detector systems, the goal of this 2 day workshop at CERN is to bring together experiences of the different LHC experiments. A substantial integrated luminosity has now been delivered and radiation effects are becoming increasingly apparent, so such discussions are timely. How well are we modelling and monitoring radiation damage? Have there been unforeseen effects, if so how was the impact mitigated? What lessons can be learned for the LHC upgrades and future vertex and tracking detector systems?

The workshop is divided into sessions on: sensor measurements & TCAD simulations, radiation background simulation and monitoring; impact of radiation on electronics/optoelectronics. See below for more detail. Please note that the electronics session has been timed to precede the ACES electronics workshop for LHC upgrades to allow easy participation between the communities: https://indico.cern.ch/event/681247/

Participation to the workshop is open to all.
Oral presentations are by invitation only.
There are no registration fees, but please register (if you'd like free coffee!)​​​​​​​

Session 1: Sensor Measurements (Mon 9.00-12.30)

Overview of radiation induced changes of sensor properties and the resulting degradation of LHC tracking performance. This will include measurements of sensor-, cluster-, and track-level observables that are sensitive to radiation damage effects including the leakage current, "depletion voltage", Lorentz angle, hit efficiency, charge collection efficiency, tracking efficiency, tracking resolution, etc. Discussion will include techniques and models used to scale sensor damage parameters over temperature, fluence and time. Outlook to expected future performance degradation and discussion on lessons learned from present detector operation towards the future (2018 and Run 3+) in relation to damage modelling, prediction, measurements and potentially mitigation.

Session 2: Electronics/Optoelectronics (Mon 14.00-17.30)

Overview of both ionizing and non-ionizing radiation effects on tracking detector electronics.  Low and high dose-effects will be discussed.  This session will include measurements and operational experience with single event upsets, calibration drift, and tuning.  The session will also include strategies for mitigating radiation-induced effects such as lowering thresholds and re-calibrating / power-cycling.  Future outlook toward the readout in 2018 and Run 3+ will be discussed.

Session 3: Radiation Background Simulation and Monitoring (Tue 9.00-12.30)

Overview of the radiation background simulations performed at the LHC experiments. Discussions on: pp collision event generation; particle transport FLUKA/G4; predicting radiation damage NIEL/TID/SEU; comparisons between the simulated predictions and the LHC Run1/Run2 detector and monitoring measurements; understanding simulation uncertainties (and safety factors) for predictions at the HL-LHC and beyond.

Session 4: Sensor Simulation (Tue 14.00-17.30)

Review strategies and algorithms deployed by the LHC experimental collaborations to simulate fluence-dependent effects in silicon tracking detectors.  Discussion will include model integration into collaboration Monte Carlo productions, benchmark studies, validation and tuning strategies, comparisons to data, challenges (e.g. annealing), and outlook for Run 3 and the HL-LHC (time permitting).

Registration
Registration
Participants
    • 08:30 09:00
      Registration 30m
    • 09:00 09:10
      Workshop welcome & goals 10m
      Speaker: Ian Dawson (University of Sheffield (GB))
    • 09:10 12:30
      Sensor Measurements

      Scope: Overview of radiation induced changes of sensor properties and the resulting degradation of LHC tracking performance. This will include measurements of sensor-, cluster-, and track-level observables that are sensitive to radiation damage effects including the leakage current, "depletion voltage", Lorentz angle, hit efficiency, charge collection efficiency, tracking efficiency, tracking resolution, etc. Discussion will include techniques and models used to scale sensor damage parameters over temperature, fluence and time. Outlook to expected future performance degradation and discussion on lessons learned from present detector operation towards the future (2018 and Run 3+) in relation to damage modelling, prediction, measurements and potentially mitigation.

      • 09:10
        Session introduction 5m
        Speaker: Michael Moll (CERN)
      • 09:15
        Pixel Leakage Current Measurements from ATLAS (20'+5') 25m
        Speaker: Aidan Grummer (University of New Mexico (US))
      • 09:40
        Leakage Current Measurements from LHCb (20'+5') 25m
        Speaker: Vinicius Franco Lima (University of Liverpool (GB))
      • 10:05
        CMS Pixel and Strip radiation damage measurements (20'+10') 30m
        Speakers: Julia Alexandra Hunt (KIT - Karlsruhe Institute of Technology (DE)), Julia Alexandra Hunt (KIT - Karlsruhe Institute of Technology (DE))
      • 10:35
        Coffee Break 25m
      • 11:00
        Pixel Depletion Voltage Measurements from ATLAS (15'+5') 20m
        Speaker: Julien-Christopher Beyer (Max-Planck-Institut fur Physik (DE))
      • 11:20
        Depletion Voltage Measurements from LHCb (20'+5') 25m
        Speaker: William James Barter (University of Manchester (GB))
      • 11:45
        Measurements with the ATLAS strip detector (20'+5') 25m
        Speaker: Taka Kondo (High Energy Accelerator Res. Organ. (KEK))
      • 12:10
        Latest News from RD50 (15'+5') 20m
        Speaker: Matteo Centis Vignali (CERN)
    • 12:30 14:00
      Lunch Break 1h 30m
    • 14:00 18:00
      Electronics/Optoelectronics

      Scope: Overview of both ionizing and non-ionizing radiation effects on tracking detector electronics.  Low and high dose-effects will be discussed.  This session will include measurements and operational experience with single event upsets, calibration drift, and tuning.  The session will also include strategies for mitigating radiation-induced effects such as lowering thresholds and re-calibrating / power-cycling.  Future outlook toward the readout in 2018 and Run 3+ will be discussed.

  • Tuesday 24 April
    • 09:00 12:30
      Radiation Background Simulation and Monitoring

      Scope: Overview of the radiation background simulations performed at the LHC experiments. Discussions on: pp collision event generation; particle transport FLUKA/G4; predicting radiation damage NIEL/TID/SEU; comparisons between the simulated predictions and the LHC Run1/Run2 detector and monitoring measurements; understanding simulation uncertainties (and safety factors) for predictions at the HL-LHC and beyond.

      • 09:00
        Introduction 10m
        Speakers: Sophie Mallows (KIT - Karlsruhe Institute of Technology (DE)), Ian Dawson (University of Sheffield (GB)), Agnieszka Mucha (UST, FPACS, CERN)
      • 09:10
        ATLAS simulation overview 25m

        20 min talk + 5 min discussion

        Speaker: Paul Miyagawa (University of Sheffield (GB))
      • 09:35
        CMS simulation overview 25m

        20 min talk + 5 min discussion

        Speaker: Sophie Mallows (KIT - Karlsruhe Institute of Technology (DE))
      • 10:00
        LHCb simulation overview 25m

        20 min talk + 5 min discussion

        Speaker: Tomasz Szumlak (AGH University of Science and Technology (PL))
      • 10:25
        Coffee break 30m
      • 10:55
        ATLAS radiation background studies using GEANT4 & GRID 20m

        15 min talk + 5 min discussion

        Speaker: Sven Menke (Max-Planck-Institut fur Physik (DE))
      • 11:15
        CMS benchmarking of the radiation fields 15m

        12 min talk + 3 min discussion

        Speaker: Igor Azhgirey (Institute for High Energy Physics (RU))
      • 11:30
        LHCb benchmarking of the radiation fields 15m

        12 min talk + 3 min discussion

        Speaker: Matthias Karacson (CERN)
      • 11:45
        Inner detector radiation field measurements with RadMons 15m

        12 min talk + 3 min discussion

        Speaker: Igor Mandic (Jozef Stefan Institute (SI))
      • 12:00
        Measurement of composition of radiation fields in the ATLAS experiment with MPX/TPX 15m

        12 min talk + 3 min discussion

        Speaker: Stanislav Pospisil (Institute of Experimental and Applied Physics, Czech Technical University in Prague)
      • 12:15
        Discussion on simulation uncertainties and safety factors 15m
        Speaker: Ian Dawson (University of Sheffield (GB))
    • 12:30 14:00
      Lunch break 1h 30m
    • 14:00 18:00
      Sensor Simulation

      Scope: Review strategies and algorithms deployed by the LHC experimental collaborations to simulate fluence-dependent effects in silicon tracking detectors.  Discussion will include model integration into collaboration Monte Carlo productions, benchmark studies, validation and tuning strategies, comparisons to data, challenges (e.g. annealing), and outlook for Run 3 and the HL-LHC (time permitting).

      • 14:00
        Introduction 10m
        Speaker: Marco Bomben (LPNHE & Université Paris Diderot, Paris (FR))
      • 14:10
        Silicon Sensor Simulation in the ATLAS Monte Carlo Framework (20'+10') 30m
        Speaker: Ben Nachman (University of California Berkeley (US))
      • 14:40
        Silicon Sensor Simulation in the LHCb Monte Carlo Framework (15'+5') 20m
        Speaker: Tomasz Szumlak (AGH University of Science and Technology (PL))
      • 15:00
        Silicon Sensor Simulation in the CMS Monte Carlo Framework (15'+5') 20m
        Speakers: Morris Swartz (Johns Hopkins University (US)), Morris Swartz (Johns Hopkins University (JHU))
      • 15:20
        Coffee break 30m
      • 15:50
        Cluster and Track Property Data/MC in ATLAS (20'+5') 25m
        Speaker: Lorenzo Rossini (Università degli Studi e INFN Milano (IT))
      • 16:15
        Discussion and Closeout 1h