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ATLAS MDT HV – LV Detector Control System (DCS)

ATLAS MDT HV – LV Detector Control System (DCS). Michail Bachtis National Technical University of Athens. DCS - Introduction. Detector Control Systems Systems to control (via computers) the operation of a HEP experiment Appeared in 1980’s Increasing Complexity of the Experiments

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ATLAS MDT HV – LV Detector Control System (DCS)

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  1. ATLAS MDT HV – LV Detector Control System (DCS) Michail Bachtis National Technical University of Athens NTU Athens - INFN Roma I Project

  2. DCS - Introduction • Detector Control Systems • Systems to control (via computers) the operation of a HEP experiment • Appeared in 1980’s • Increasing Complexity of the Experiments • Control of a large amount of parameters • Check of the smooth operation of the experiment • Characteristics • Operators don’t need to be sub-detector experts • Operation procedures become very easy • Automatic Error Recovery procedures can be implemented NTU Athens - INFN Roma I Project

  3. ATLAS ATLAS Inner Detector Calorimeters Muons TRT Pixel LArg Tile SCT Trigger Precision TGC RPC MDT CSC NTU Athens - INFN Roma I Project

  4. MDT Chambers +3080V High Voltage Electronics Drift Tube Also -Alignment Modules -Temperature (NTC) Sensors -B – Field Sensors Gas Inputs/ Outputs Read Out Electronics Tubes NTU Athens - INFN Roma I Project

  5. MDT Chamber DCS MDT GAS Power Supply Alignment MDM Part HV LV Temp B-Field JTAG ~2000 HV Channels ~700 LV Channels NTU Athens - INFN Roma I Project

  6. Power Supply Hardware Requirements CAEN Power Supplies EASY SYSTEM Computer Control Compatibility with Control Software Radiation Protection Solution… NTU Athens - INFN Roma I Project

  7. CAEN EASY System Architecture NTU Athens - INFN Roma I Project

  8. Software (I/II) • CAEN OPC Server • Connection with Hardware (I/O) • Unfortunately supported only for Windows OS • ETM PVSS II • JCOP Framework • Oracle Database NTU Athens - INFN Roma I Project

  9. Software (II/II) OPC Server PVSS II JCOP FRAMEWORK ORACLE Conditions Database Hardware CAEN EASY SYSTEM NTU Athens - INFN Roma I Project

  10. System Design • Hierarchical Design • Hardware Hierarchy • Logical – Geographical Hierarchy • Friendly User Interface • Visualization of the system • Various Plots of the data • Customized Widgets NTU Athens - INFN Roma I Project

  11. Hierarchical Design Hardware Hierarchy Ch1 Main Crate A1676 Board Remote Crate Ch2 EASY Board Logical Hierarchy .... MDT Ch1 Barrel bis1a08 Ch2 EndCap NTU Athens - INFN Roma I Project

  12. Specifications • Visualization of the system status • Tree like representation of the system • 3D representation of the system • Data Management • Real time monitoring of the values (Voltage , Current , Alarms) • Versatile plotting system • Voltage , Current Plots • Data from archive • Automation • Error Recovery • System proposes procedures to the user • Automatic Recovery capabilities ( dangerous..?) NTU Athens - INFN Roma I Project

  13. User Interface Tree View 3D MDT Display Controls Log Window NTU Athens - INFN Roma I Project

  14. 3D Display ActiveX Technology Visual C++ & 3D Game Engine from 3D State Rotation , Zoom , Chamber Selection Change of chamber Color by state Show / Hide Capabilities of Different sub-detectors (bis , eml , bil , bee ,etc) NTU Athens - INFN Roma I Project

  15. Controls Turn On /Off Monitoring Plots DB Analysis Channel Settings Massive Operations On/OFF, Set values System Status (always exists) Logical view, FSM,OPC,RdB NTU Athens - INFN Roma I Project

  16. Plots NTU Athens - INFN Roma I Project

  17. Automation Example An On/Off Switch • Modeling of system behavior using Finite State Machine (FSM) Algorithms • Each System is represented using a finite number of states • Each state contains actions • The actions can be transitional or non - transitional On pressed ON On pressed Off pressed OFF Off pressed NTU Athens - INFN Roma I Project

  18. FSM(I/II) LOW VOLTAGE FSM HIGH VOLTAGE FSM OvC OvC Error Recovery Error Recovery Physics (ON) Trip Physics (ON) Trip RUp RDwn Other Errors Other Errors Off Off Error Recovery Error Recovery NTU Athens - INFN Roma I Project

  19. FSM(II/II) • Error Recovery Process • The user is informed and proposed a procedure • Automatic Recovery is possible • Chamber State • The state of the chamber is resolved by the HV and LV channel states using some state propagation rules • Propagation Rules • If all Off -> Chamber Off • If all Physics->Chamber Physics • If any Error->Chamber Error • If all warning or (warning and off ) or (physics and off) or (warning and physics) ->Chamber Warning NTU Athens - INFN Roma I Project

  20. Trip Recovery (Under Study) On Chamber HV Electronics Problem An example using history search Propose: 1)Leave Channel Off 2) Call Expert Very often ~ms ~100-1000s How often does The channel Trip? Time between Trip and On TRIP Occurs Archive Search ~s Not often! Gas problem (ie Low Pressure) Random Effect Propose: Bring Channel Back On NTU Athens - INFN Roma I Project

  21. Conclusions • MDT Power Supply DCS - > Complex System • 2700 Channels to be read and stored to the Oracle Database • Up to 6 PCs may be used to handle the data • Final User Interface and Automatic Error Recovery under study . NTU Athens - INFN Roma I Project

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