ATLAS MDT HV LV Detector Control System DCS

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

DCS - Introduction l Detector Control Systems ¡ ¡ ¡ l 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

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

MDT Chambers +3080 V 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

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

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

CAEN EASY System Architecture NTU Athens - INFN Roma I Project

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

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

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

Hierarchical Design Hardware Hierarchy Main Crate Ch 1 A 1676 Board Remote Crate Ch 2 EASY Board Logical Hierarchy . . MDT Ch 1 Barrel bis 1 a 08 Ch 2 End. Cap NTU Athens - INFN Roma I Project

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

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

3 D Display Active. X Technology Visual C++ & 3 D Game Engine from 3 D 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

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

Plots NTU Athens - INFN Roma I Project

Automation l 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 NTU Athens - INFN Roma I Project Example An On/Off Switch On pressed ON On pressed Off pressed OFF Off pressed

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

FSM(II/II) l Error Recovery Process ¡ ¡ l The user is informed and proposed a procedure Automatic Recovery is possible Chamber State ¡ Propagation Rules The state of the chamber is resolved by the HV and LV channel states using some state 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

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

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