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Radiation Monitoring in ALICE

Radiation Monitoring in ALICE. Andreas Morsch ALICE Technical Board 27/4/2004. Outline. Introduction Radiation Monitoring at CERN Technologies ALICE requirements Time Schedule. Introduction. We need Radiation Monitoring for

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Radiation Monitoring in ALICE

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  1. Radiation Monitoring in ALICE Andreas Morsch ALICE Technical Board 27/4/2004

  2. Outline • Introduction • Radiation Monitoring at CERN • Technologies • ALICE requirements • Time Schedule

  3. Introduction • We need Radiation Monitoring for • Mapping of radiation field, to check accuracy of background simulations and identify possible leaks • Long-term monitoring of integrated radiation exposure • Online monitor for beam conditions and possibility to request beam-abort • Post-mortem analysis of accidents

  4. Radiation Monitoring at CERN • Two Working Groups • RADWG: Radiation Monitoring of the LHC Machine • RADMON: LHC Experiment Radiation Monitoring • Chair: E. Tsesmelis • So far three full meetings (including one common RADWG+RADMON meeting) • Last meeting 6/4/2004 • http://lhc-expt-radmon.web.cern.ch/lhc-expt-radmon/

  5. Radiation Monitoring at CERN • CERN PH-TA1-SD Group • Support and development in the field of Solid State Detectors • Radiation Hardness Tests • Significant amount of theoretical knowledge and practical experience in radiation related effects and dosimetry (RD50 Collaboration) • Irradiation facility in the PS East Hall. • Passive dosimetry • In collaboration with F. Ravotti (TS/LEA): active dosimetry, development of online monitors for CMS • Proposal: • Continue and extend dosimetry developments to serve all LHC experiments.

  6. TA1-SD Proposal • Develop and characterize dosimeter boards with on-line readout for and together with the LHC experiments • Boards being as flexible as possible (dose/fluence range, sensitivity, particle type, shape of board …) in order to allow and optimal adoption to specific sub-detector environments. • Output signal compatible to all Detector Control Systems • Provide the dosimeter boards and/or active dosimeters to the experiments • Support the experiments in qualifying passive dosimeters

  7. What TA1-SD will not do • Impose their radiation monitoring concepts on the experiments • Integrate the dosimeters / dosimeter boards into the experiments

  8. Passive Dosimeters Data: I.Floret (SC/RP – High level dosimetry)

  9. Active Radiation Monitors RadFETs Build-up of charge in MOSFETs SiO2 layer (Ionizing Dose)  (integrating measurement). p-i-n diodes Optically Stimulated Luminescence (OSL) Bulk damage in high r Si-base (particle fluence)  (integrating measurement). Charge buildup in sensitive material detrapped by IR stimulation (Ionizing Dose)  (instantaneous measurement).

  10. (0.4 mm) BPW34F/Pad  Fequivalent[cm-2] {HEP, nF} (1.6 mm) OSLs  D [Gy] {g, HEP} Pad BPW34F n-OSLth  Fth [cm-2] {nth} Front-end Front-end Front-end n-OSLF  FF [cm-2] {nF} DCS Dosimeter Integration RadFETs  TID [Gy] {g, HEP} • We plan to put a very early prototype board into our irradiation facility this year

  11. Other Projects • LHCb • Metal foil detector for RM of Si Tracker • low-mass, simple, cheap, any-size and shape, ... • thickness < 1mm possible • TeVatron and HERA • Large experience • Redundant measurements • Many technologies • Still evolving

  12. ALICE Requirements • Integrated dose / year • 0.1 mGy – 0.3 kGy • Hadron fluence 107 – 1011 cm-2 / year • Monitor beam condition with possible request of beam abort • ~20 positions inside and outside L3 at different distance from beam pipe

  13. Time Schedule (Experiments) • - June 2004 • Experiments nominate contact persons • For ALICE: Marc Tavlet, CF, AM • Until end 2004 • Experiments work together with Ch. Joram on a document describing the conceptual lay-out of the RM system • Discussion based on questionnaire

  14. Questions to experiments • Measurement for which purpose? • (Beam dump?  Beam Condition Monitor Group) • Detector protection (e.g. switching off a sub-detector) ? • Test of radiation shielding? • Long term monitoring? • Analysis of beam accidents? • Instantaneous dose rate measurement needed ? • trigger on too high dose rate/flux needed? if so, in which time scale? • Measure which kind of information? • ionizing dose • displacement damage • thermal neutrons • Dose/Fluence range and sensitivity needed? • Active and/or passive devices ? • readout cycle? / replacement cycle?

  15. Questions to experiments • Number of monitoring modules? • Environment of module? • Temperature and Temperature stability? • Space constrains? • Maximum size of sensor module? • Distance between sensor and readout electronics (cable length)? • Lifetime of modules? • Will we be able to repair/replace/upgrade them? • Readout: • Radiation hard electronics on-board needed (OSL needed)? • Specific restrictions due to the individual experiments? • Which kind of signals can be accepted by the detector control system of the Experiment? • Deadlines • Decision about size of the module • Decision about number of cables • Decision about signal type • Installation deadline • Service/Maintenance after installation • Which kind of service/maintenance is expected after installation?

  16. Time Schedule (TA1) • End 2004 • First prototype of integrated board and readout system tested • Mid 2005 • Components of radiation monitoring board fixed • End of 2005 • Full prototype tested • Start of mass production

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