Post on 20-Dec-2015
transcript
Anna Sfyrla - University of Geneva IEEE, Rome 2004
The Detector Control System for the
ATLAS SemiConductor Tracker Assembly Phase
Anna SfyrlaUniversity of Geneva
on behalf of the ATLAS SCT collaboration
IEEE, Rome 2004
SCTDCS
Anna Sfyrla - University of Geneva IEEE, Rome 2004
The ATLAS SemiConductor Tracker (SCT)
1.53 m
5.6 m
1.0
4 m
9 disks
9 disks
4 barrel layers
ModuleSCT Building Block
Constructed by 4 p-n strip silicon detectors & FE electronics
768*2 strips & active length of 123.2 mm
Silicon surface: ~62 m² -> 4088 modules -> ~6.3 million readout channels
* ~760 cables & ~2400 fibers required to transfer information from these channels
* Cooling System keeping electronics, modules and cables at low temperature
* Hundreds of sensors providing information about the environmental parameters
the coherent and safe operation of the detector demands a stable Detector Control
System
Anna Sfyrla - University of Geneva IEEE, Rome 2004
Detector Control System (DCSDCS)
DCS
Hardware and
Software Interlocks
ActionsHandling
Warnings
AlarmsErrors
Interactionwith
LHC Acceleratorand
External Systems
Interactionwith other
Subdetectors
DCSDistributed Back-End (BE) System
Running on PCsFront-End (FE) Systems (sensors, controllers…)
Supervisory Control and Data Acquisition System (SCADA) -> PVSS II
Hierarchical organization simulates the natural mapping of the experiment
Final State Machine (JCOP)States and transitions handling
Embedded Local Monitor Board (ELMB)Standard Analog&Digital I/O
Radiation hard – Low power consumption
CANbus
Detectors are complicated systems with huge number of parameters to be monitored and controlled-> Powerful DCS is needed to ensure their safe and coherent operation!
Common Architecture for all the LHC experiments (Joint Controls Project – JCOP)
Anna Sfyrla - University of Geneva IEEE, Rome 2004
Global Control Station
Subdetector Control Station
LocalControl Station
Hardware
FE System
Communication
PCsPVSS Projects
DCS Hierarchy
Anna Sfyrla - University of Geneva IEEE, Rome 2004
SCT DCS HardwareCooling SystemSystem common for SCT and Pixels
• Radiation Damage = f(Temperature) -> operational temperature of the two detectors: -7°C• Initial testing and warm startup at temperatures ~ +15°C• Thermal stability better than 2 °C and tolerance to thermal shocks
-> flexible cooling system required!flexible cooling system required!
Evaporative fluorcarbon system Liquid C3F8
non-flammablenon-conductiveradiation resistant
Controlled by Programmable Logical Controllers (PLCs)
Anna Sfyrla - University of Geneva IEEE, Rome 2004
SCT DCS Hardware
All sensors monitored by software
Cooling sensors monitored by Cooling sensors monitored by additional hardware interlockadditional hardware interlock
BBIM Crate with the IBOXes
BBIM : Building Block Interlock MonitoringIBOX : Interlock BoxIMatrix: Interlock MatrixSIC : System Interlock CardCC : Crate ControllerPS : Power SuppliesOPT : Optical Decoupling
Temperature sensors (NTC thermistors)• temperature in the outlets of the cooling pipes• temperature near the edge of the support structure • air temperature inside the detector
Humidity sensors (Xeritron)• humidity inside the detector
All sensors monitored by software
Cooling sensors monitored by Cooling sensors monitored by additional hardware interlockadditional hardware interlock
Thermal Enclosure• Detector in controlled environmental conditions• Monitoring of temperature, humidity and pressure
Environmental System
Schematic Layout of the Interlock System
Anna Sfyrla - University of Geneva IEEE, Rome 2004
SCT DCS HardwarePower Supplies SystemProvide the modules with power and slow control signals
Provide the DCS with current, voltage and temperature information from the modules
Low Voltage (LV) cardControls 4 channelsOutputs Logical Signals for the FE electronics
Analogue Voltage (Vcc) andDigital Voltage (Vdd) for the hybridVCSEL Voltage andPIN bias Voltage for the optical communication of the module
High Voltage (HV) cardControls 8 channelsProvides bias voltage to the detector
Crate Controller (CC)ELMB based interface for the Communication of the LV and HV cards
Power Pack (PP)Redundant powering of the crates
System Interlock Card (SIC)Interface between PS and Interlock
Anna Sfyrla - University of Geneva IEEE, Rome 2004
PS GUIPower Supplies Diagnostic Panels
Global Monitoring of a crate
Overview Panels
Anna Sfyrla - University of Geneva IEEE, Rome 2004
Final State Machine (FSM)
ATLAS Subdetector Supervisor : Common Infrastructure Control Station (CIC)SCT supervisor : PS Project
SCT DCS BE SystemProjects’ Features
• Monitoring and Control of all possible values• Additional functionalities where needed
(IV curves, dew point calculation…) • PVSS archiving for storing running conditions & trending for plotting parameters’ values• Configuration files for loading & storing system information
• Warnings and Alarms from ENVR and Cooling systems propagated to the PS system (Distributed Projects)
- Temperature & Humidity Limitations- Voltage & Current Limitations
• DAQ & DCS Communication (DDC) The two projects are sharing common databases
Anna Sfyrla - University of Geneva IEEE, Rome 2004
SCT AssemblySCT Assembly proceeding in: Oxford (Barrels)
Liverpool & NIKHEF (Endcaps)
Modules on Barrels and EndcapsComplete DCS chain
Evaporative cooling systemInterlock system installedPower Supplies installed
-> System set tested successfully
Pictures taken at Oxford, by Georg Viehhauser. More about assembly at Oxford in his talk.
Anna Sfyrla - University of Geneva IEEE, Rome 2004
Final Assembly Site: CERN
Dedicated facility for the Inner Detector Assembly and Integration
SR1 Building
SCT Integration
Thermal Enclosure - All the cables are installed in the barrel support structure
A Crate installed in the Rack Area
Anna Sfyrla - University of Geneva IEEE, Rome 2004
Single Barrel – Full Barrel – Endcap Acceptance Tests -> Verification of the proper function of each component after transportation and before final assembly
700 cables and 2400 fibers installed in defined mapping and tested- 2 cables with defects- No faults in the fibers
Long term tests in all the DCS components- Thermal Enclosure monitoring- Detector Environmental monitoring- Cooling monitoring- Permanent use of the Power Supplies Project
Disk Sector with modules mounted on- Fitted with Cooling Pipes and Environmental Sensors- Monitoring of up to 6 modules successful
DCS Chain in the ATLAS Testbeam- Modules powered using the PS DCS; - System working!
-> IV of 1 module using the PS Project (September 2004)
Acceptance Tests
SCT Testbeam 2004
Temperature monitoring using the Envr ProjectPVSS Trending Tool used
Anna Sfyrla - University of Geneva IEEE, Rome 2004
DCS Performance Tests
• Immediate Communication between the distributed projects (Ethernet Speed)-> Messages exchanged immediately
0.9ms separation between the messages in the long PS CANbus cable (100% Occupancy); 60% CANbus Occupancy; 11 crates on a CANbus;
-> 4s between each readout of all the parameters (11crates x 1500parameters/crate).
• 6s needed to switch off a crate- result reproducible many times;- still the same if more than one crates switched off simultaneously
Good Performance is an important issue since the system gets more and more complicated- for single barrel acceptance tests up to 15 crates used simultaneously;- for full barrel acceptance tests up to 44 crates used simultaneously;- 355 environmental sensors mounted on the four-barrel system;- later, disks integrated…
Anna Sfyrla - University of Geneva IEEE, Rome 2004
Conclusions & Future PlansSCT Module Production reaching an end
Module assembly on Barrels & Endcaps underway
BE & FE DCS Systems ready for acceptance tests
Extensive DCS Testing & Upgrading Vital for the security and performance of the Detector
……Looking forward to testing the SCT fully assembled!Looking forward to testing the SCT fully assembled!
Looking forward to see such pictures…
…not only in simulations!
Anna Sfyrla - University of Geneva IEEE, Rome 2004
27 km circumferenceoperating luminosity 1034cm-2s-1
bunch spacing 25ns -> ~23 collisions per bunch crossing
The LLarge HHadron CCollider (LHCLHC) at CERN
7 TeV beam energy