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The Detector Controls System of ALICE TRD

The Detector Controls System of ALICE TRD. Oliver Busch, Physikalisches Institut, Heidelberg University for the ALICE collaboration. outline. The ALICE experiment The TRD Detector Controls System Front-end electronics Trigger LV and services HV. TPC. ITS. TRD.

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The Detector Controls System of ALICE TRD

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  1. The Detector Controls System of ALICE TRD Oliver Busch, Physikalisches Institut, Heidelberg University for the ALICE collaboration

  2. outline • The ALICE experiment • The TRD Detector Controls System • Front-end electronics • Trigger • LV and services • HV

  3. TPC ITS TRD ALarge Ion Collider Experiment • dedicated heavy ion experiment • at CERN LHC • TRD provides tracking and • electron ID in the central barrel • fast TRD trigger • (jets, high momentum electrons, ...) • over wide acceptance Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  4. ALICE TRD • 522 drift chambers, 675 m2 • >1000 HV channels • 25 m3 Xe based gas mixture, • circulating gas system • 89 LV power supplies • 1.15 M electronics channels • pre-trigger and L1 trigger Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  5. ALICE DCS: the mandate ensure safe detector conditions, allow failsafe, reliable, consistent and intuitive monitoring and operation of a highly complex detector by experts as well as non-experts allowed to strongly reduce shift crew running the ALICE detector Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  6. TRD DCS • GUI based on a commercial SCADA • system, tree of panels • detector conditions mapped on • Finite State Machine, • detector operation = transition • between states via FSM commands • TRD FSM fully integrated into • ALICE FSM • supervisory layer distributed over • 7 WINDOWS + 3 Linux machines • operation from single work place (on-site and remotely) Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  7. tree of panels for subsystem • monitoring / expert operation • hierarchical access control • hierarchical system of alerts, • and expert notifications (e.g. via SMS), • device protection by automatic hardware and software interlocks • archival of slow-control, calibration and configuration data in dedicated • DBs (ALICE-wide 1000-100000 inserts/s), • prerequisite for any physics analysis Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  8. retrieval and display of slow-control data: trending Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  9. Front-end electronics • PreAmplifier/Shaper, ADC, • Tracklet Preprocessor • 1,15 M channels • optical readout • monitoring / operation: DCS boards • running Linux • (voltage regulators, trigger distribution, ...) • DCS layers: FEE servers, Intercom, client • Communication via ethernet (DIM protocol) Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  10. electronics configuration • according to run type, • magnet polarity (...) • GUI for ‘patches’ • (e.g. masking noisy channels) • hierarchy of hard- and software • interlocks to protect • electronics from overheating Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  11. Pre-Trigger and GTU • Pre-Trigger: fast wake-up signal (~400 ns after interaction), • from V0, T0 + TOF signals • Global Tracking Unit: compose tracks from tracklets, • generate L1 trigger (~ 7 us after interaction) • monitoring (temperatures, trigger rates, • optical power, ..) via DIM • DCS integration via FSM • configuration for different experimental • scenarios Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  12. LV and services • 89 LV Power supplies, >200 channels, • monitoring and control via • Ethernet / OPC • cooling water transports • ~65 kW heat out of L3 magnet • Xe based gas mixture: closed circuit • gas system, 14 mixing stations • cooling interlocks for • Power Supplies and to FED • automatic monitoring of LV line • resistance Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  13. High Voltage • 36 (pos + neg) 32-channel modules, • >1000 channels, 5 crates • control via 250 kbit/s CAN bus • through dedicated DIM server • (service + RPC structure matching • r/w OPC items) Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  14. HV operation and calibration • automatic ramp / ramp inhibit according • to LHC status (e.g. beam injection) • automatic chamber conditioning • HV gain calibration channel-by-channel • ( = chamberwise) • ensure stable trigger conditions: • semi-online calibration of gain and drift velocity • using data from GOOFIE • (external gas monitor detector to measure • drift velocity and gain) Oliver Busch - TRDs for the 3rd millenium, Bari 2011

  15. summary • implemented a TRD DCS based on FSM and GUI • system of alerts and automatic interlocks to ensure • safe operating conditions • standard Detector Controls procedures highly • automatized to allow easy operation • fully integrated into central ALICE DCS framework • successfully • working at LHC ACR, 2010 CERN T10, 2004 Oliver Busch - TRDs for the 3rd millenium, Bari 2011

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