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Radiation Monitors for LHCb

Radiation Monitors for LHCb. Goals. Radiation levels up to >10kGy predicted for 10 years of LHCb running Level of radiation has influence on detector and electronic performance Active radiation monitors give levels every second Feedback during run possible ->background

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Radiation Monitors for LHCb

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  1. Radiation Monitors for LHCb Dirk Wiedner / LHCb

  2. Goals • Radiation levels up to >10kGy predicted for 10 years of LHCb running • Level of radiation has influence on detector and electronic performance • Active radiation monitors give levels every second • Feedback during run possible ->background • Time correlation to electronics or detector performance possible • Calibrate simulated radiation levels Dirk Wiedner / LHCb

  3. Radiation level after RICH2 versus x-coordinate Gloria Corti Radiation levels Radiation level in Bending plane over 5 years 2x1032 + 5 years 5x1032 [1/(cm2s)] Dirk Wiedner / LHCb

  4. Radiation levels • 103 to 104 Gy at silicon detectors • 102 to 103 Gy at outer tracker and calorimeters • 10 - >100 Gy at on detector electronics • <10 Gy in bunker and balcony racks Estimates for 10 years of running Dirk Wiedner / LHCb

  5. Active monitors • Thin Oxide RadFET: 0.1 to 10 kGy • Thick Oxide RadFET: 10-3 to 10 Gy • High sensitive silicon diode 108 to 2x1012 1MeV equ. Neutrons/cm2 • Particle detector diode 1011 to 5x1014 1MeV equ. Neutrons/cm2 • Temperature sensor • Chosen by RADMON group Dirk Wiedner / LHCb

  6. Position active monitors • Detector acceptance • x-y cross section after RICH2 at 50/100/180/280 mrad • 3 additional sensors along z at 320 mrad • Electronics • 12 sensors at major FE-electronic areas (boxes and racks) • Reference in D3 Dirk Wiedner / LHCb

  7. Position top view Dirk Wiedner / LHCb

  8. Package • Small (few cm) package • Low material budget • 250 μm PCB • 4 sensors + PT100 + reference resistor • Developed by RADMON group Dirk Wiedner / LHCb

  9. Measurement • Threshold voltage for RadFETs • Forward Voltage PIN-diode • Leakage current detector diode • Readout system developed by Ljubljana ATLAS group • ELMB has 64 ADC channels • ELMB DAC for IBIAS Dirk Wiedner / LHCb

  10. Data logging • ELMB has CANbus interface • CAN to USB • PVSS control • 1Hz rate for radiation values • Data archive: Condition DB Dirk Wiedner / LHCb

  11. Radmon box TS/LEA • LHC machine radiation monitor • 10 installed at point 8 (Cryogenics) • Allows x-check with RadFETs and diodes Dirk Wiedner / LHCb

  12. Metal foil detector • Aluminum foil sensor for inner Tracker • Developed by the Kiew group • 28 cells covering 75 mm x 110 mm each • Complementary to RadFET/Diodes 535 mm 218 mm Dirk Wiedner / LHCb

  13. Beam condition monitor • Diamond sensors very close to the beam • 3 stations with 8 sensors each • Optical data transmission • TELL1 DAQ board used CFC board CVD diamond Dirk Wiedner / LHCb

  14. Passive sensors • Installation at active monitor positions for x-check • Additional 20 sensors per calorimeter: SPD/PS, ECAL, HCAL • See talk of Ch. Ilgner Dirk Wiedner / LHCb

  15. Positions Beam Condition Monitor Metal Foil Detector TS/LEA boxes Passive Radmon Dirk Wiedner / LHCb

  16. Radiation background signal • Radiation background at detector for LHC • Combination of BCM, TS/LEA RADMON, Al-foil and active monitors • Technical implementation to be seen Dirk Wiedner / LHCb

  17. Next steps • Lab setup with sensors, ELMB (DAC) • Produce electronics for all 26 sensors • Order 32 sets of sensors from RADMON group / M. Glaser Dirk Wiedner / LHCb

  18. Summary • Radiation map with RadFETs and diodes at 26 positions, ATLAS readout • Passive monitor radiation map • Dedicated radiation monitoring for • Inner tracker – metal foil detector • Beam condition – diamond sensors • Cryogenics at point 8 – TS/LEA box Dirk Wiedner / LHCb

  19. Backup Dirk Wiedner / LHCb

  20. Sensor details • Sensitive P-I-N CMRP 108–2×1012 cm-2 • High rate P-I-N BPW 34 2•1012-4•1014cm-2 • RadFET thick Oxide CNRS 10-3–10 Gy • RadFET thin Oxide REM Oxford 0.1–10kGy • PT100 • 10KOhm reference resistor Dirk Wiedner / LHCb

  21. Further sensors at LHCb • Passive Dosimeters • Installation at same +additional positions for x-check • See talk of Ch. Ilgner • Beam Condition Monitor • Diamond sensors very close to the beam • RADMON box (TS/LEA) • LHC machine radiation monitor • 10 installed at point 8 (Cryogenics) • Aluminum foil sensor for inner Tracker, • Developed by the Kiew group • Complementary, covers IT detector Dirk Wiedner / LHCb

  22. Metal foil detector • 5 layers of Al foil • 2 shield • 2 acceleration • 1 sensor Dirk Wiedner / LHCb

  23. Metal foil principle Dirk Wiedner / LHCb

  24. Metal foil signal flow Dirk Wiedner / LHCb

  25. Metal foil sensor Dirk Wiedner / LHCb

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