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Presentation of a TPC Resistor-Rod Cooling Solution in the ALICE DCS

Presentation of a TPC Resistor-Rod Cooling Solution in the ALICE DCS. Presentation based on first URD inputs and test results. Tarek ben Ahmed. Introduction. Two rods per side Each Rod produces 25W Temperature stability inside the drift volume  0.1 o C Closed gas cooling circuit

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Presentation of a TPC Resistor-Rod Cooling Solution in the ALICE DCS

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  1. Presentation of a TPC Resistor-Rod Cooling Solution in the ALICE DCS Presentation based on first URD inputs and test results. Tarek ben Ahmed

  2. Introduction • Two rods per side • Each Rod produces 25W • Temperature stability inside the drift volume  0.1 oC • Closed gas cooling circuit • Cooled by 10m3/h-20m3/h CO2 • CO2 has to be conditioned by heaters

  3. Controls Part • Check starting conditions (also with subsystems) • Control of conditioning process (PLC/PID) • Take action in case of uncontrollable temp. increase • Provide user interface (PVSS II) • Monitor results and status (PVSS II) • Archive results

  4. Resistor Rod Cooling System

  5. Control Principle of R-Rod Cooling LAN Fieldbus

  6. Results • 0.4 oC temp. accuracy needed inside the rod to obtain 0.1 oC accuracy in the surrounding gas volume (low transition in gas volume) • SIEMENS OPC server tested successfully • Prototype tests done with SIEMENS S7-300 (only reading and monitoring)

  7. Next Steps • Implementation of conditioning process (PID loop needed => PID self-tuner ?) • Implementation of PVSS II • Investigation of alternative system solutions (SCHNEIDER) • Integration of HV and current monitoring system

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