Transcript ALICE_DCS_POPESCU

Machine and Controls aspects
ALICE TPC control
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S.Popescu
Overview
• LHC Control Context
• Technologies used
• Alice TPC control concept
• Common solutions used
• Conclusions
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LHC’s Control context
• The Joint Controls Project (IT-CO) coordinates
the control for the 4 LHC experiments
• JCOP approach can be summarize as follow:
– Decision made via consensus of LHC experiments
– Commercial solutions wherever possible used (this is
due to limited manpower and maintenance issues)
– General purpose and maintainable control solutions
and component
– Experiments choose what to use and for what
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Technology used for controls
• The main concept was to be able to
remotely control any hardware as much as
possible
• Integrate different subsystems and share
the information between them
• Having the possibility to scatter and
distribute the information between control
systems or subsystems
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Controls technologies
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SCADA – PVSS a common
software solution
• Architecture
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Device structuring
Completely event driven
Data point concept unique for each individual hw
Standard PVSS tools based on associated script –easy to operate
between detectors and experiments
• Flexibility
– Everything can be modified on-line
– Powerful scripting language (~Ansi C)
• Scalability
– Scattered PVSS systems
– Distributed PVSS system (up to 127)
• Openness
– Windows and Linux support
– OPC, DIM communications protocols
– Http server communications
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Alice TPC context
• Most of the common solutions (hardware
and software) used namely for
– TPC RO chamber HV  Iseg PS
– TPC RO chamber LV  Wiener PS
– TPC RO chamber Temperature monitor 
ELMB (Embedded Local Monitoring Box – an
Atlas product)
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TPC HV and LV
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HV impl in FW
Temperature monitoring
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Conclusion
• Alice TPC uses most of the common solutions
developed by JCOP
• Other local developing like laser system, very
high voltage PS (100kV),gas system, Front-End
ReadOut electronic , are integrated in the PVSS
system by developing local solutions
• There is a nice road from the first prototype
build to…final detector
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LV and HV values
Analog part
Digital part
Chamber type
Voltage [V]
Current [A]
# of channels
IROC+OROC
3.3
51
36
IROC+OROC
2.5
198
36
Chamber type
Voltage [V]
# of channels
Anode
IROC
1300
36
Anode
OROC
1450
36
Edge wire
IROC, OROC
600
72
Skirt
IROC, OROC
400
72
Total
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