Detector Control System of the ATLAS MDT system

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Detector Control System of the ATLAS MDT system

• Anastasios Iliopoulos
• N.T.U.A.

XXV HSSHEP Workshop Athens, 28-31/3/2007
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At a glance

• Power Supply of MDT chambers
• ATLAS Detector Control System
• PVSS and DCS frameworks
• Finite State Machine
• Graphic User Interface
• Features under development

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Power Supply of MDT chambers
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Power Supply of MDT chambers

• Two multilayers of drift tubes
• High voltage Readout sides
• Each multilayer is operated by a separate high
  voltage channel (3000V)
• Low voltage (5V) is supplied to the Readout side

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Detector Control System (DCS)

• System to control the operation of a HEP
  experiment using computers
• Increasing the complexity of an experiment
• Organized control of a large amount of parameters
• Continuous monitoring of the experiment
• Automatic errors recovery procedures
• Operation procedures become very easy operators
  dont need to be experts

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ATLAS DCS Basic Structure
ATLAS
Track Detector
Hadronic Calorimeter
Muon Spectrometer
Electromagnetic Calorimeter
MDT
CSC
RPC
Power Supply
Monitoring
Temperature, Magnetic Field
High Voltage
Low Voltage
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ATLAS DCS Basic Structure
PVSS
DCS System
DCS System
Chambers (devices)
OPC Server
CAEN Power supply units
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PVSS and DCS frameworks

• PVSS II v3.6 by ETM
• Communication with hardware (e.g. CAEN Power
  Supply units via OPC server)
• Storing data (Internal and external archiving
  Oracle db)
• Warnings and Errors handling
• Built-in programming language C
• Graphic Editor
• JCOP and ATLAS Frameworks
• Extended features for programming and development
• Organization of libraries, panels and scripts
• Naming and Look conventions (system names, panel
  names, panel size)
• FSM user interface and integration/programming
  features

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Finite State Machine

• Mike Bachtis Anestis Iliopoulos Development of
  a PVSS project for control and monitoring the
  power supply of MDT chambers
• The heart of the project is a FSM
• FSM decides HV and LV channel States by reading
  the status bitmask
• Status bitmaskOnOff20rUp21rDown22OvC2
  3Trip29
• Decides the State and the Status for the chamber
• Rules for State and Status propagation to upper
  levels
• State defines the operation mode of the system
  (ON, OFF, etc)
• Status defines how well the system is working
  (OK, Warning, Alarm, etc)

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Finite State Machine

• PROPAGATION RULES
• State
• If All Channels OFF then Chamber State OFF
• If only LV is ON then Chamber State STAND_BY
• If LV is ON and ½ HV is ON then Chamber State
  ON50
• If LV is ON and both Multilayers are ON then
  Chamber State ON
• Else Chamber State UNKNOWN
• Status
• If a channel trips or returns h/w error then
  Chamber Status ALARM
• If an overcurrent happens then Chamber Status
  WARNING
• Else Chamber Status OK

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MDT FSM Structure
ATLAS
? GCS Overall control of the detector
State Status
Commands
MDT
? SCS Full local operation of sub-detector
Barrel A
EndCap A
Barrel C
EndCap C
? TTC Partitions ?
INNER
MIDDLE
OUTER
? Layers
BMS1C14
BML1C01
? Chambers
Blanc font Control Units (CU) Purple font
Device Units (DU)
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User Interface

• First step FSM Hierarchy Creation

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User Interface

• First step FSM Hierarchy Creation
• Automatic FSM generation
• Automatic set of all necessary parameters
• Option of reading chamber parameters from a
  simple text file

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User Interface

• Second step Start FSM and main project panels
  using Device Editor and Navigator

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Features Under Development

• Configuration DB Tool
• Storing configuration schemes to oracle db for
  quick apply on the system
• (Run, Beam_Wait, Cosmics etc)
• Conditions DB Tool
• Storing voltage and/or current values during run
  time to oracle db

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Thank you !

• NTUA DCS Team T. Alexopoulos, G. Tsipolitis, E.
  Gazis
• M. Bachtis, C. Tsarouchas, A. Iliopoulos