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HEP 2008, Ancient Olympia

Development and Performance of the High Voltage Distribution System for the ALICE TRD A. Markouizos, P. Mantzaridis, P. Mitseas, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou University of Athens. HEP 2008, Ancient Olympia. Outline.

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HEP 2008, Ancient Olympia

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  1. Development and Performance of the High Voltage Distribution System for the ALICE TRDA. Markouizos, P. Mantzaridis, P. Mitseas,A. Petridis, S. Potirakis, M. Tsilis, M. VassiliouUniversity of Athens HEP 2008, Ancient Olympia

  2. Outline XXVI Workshop on Recent Developments in HEP M. Vassiliou • Introduction • HVDS Overview • HVDS Commissioning • Performance Tests • Magnetic field test • Test on the TRD-SMI / SMII • Summary

  3. TRD XXVI Workshop on Recent Developments in HEP M. Vassiliou

  4. TRD 540 individual modules:18 azimuthal sectors-supermodulesEach supermodule contains: 5 detector stacks of 6 module layers each Each module consists of: Introduction ALICE TRD • radiator • drift chamber • readout electronics XXVI Workshop on Recent Developments in HEP M. Vassiliou 4

  5. TRD Supermodule XXVI Workshop on Recent Developments in HEP M. Vassiliou

  6. HVDS Description • A Master/Slave power supply distribution system has been designed and constructed in order to provide the required anode (1.9kV) and drift voltage (-2.5kV)to the ALICE TRD readout chambers. • The system can switch on andoff,monitor(at the nA level), protect, and regulate(leverage of 1000 Volts)each channel from a common ceiling voltage. XXVI Workshop on Recent Developments in HEP M. Vassiliou

  7. HVDS Overview High Voltage Distribution System: Simple design Reduced complexity Reduced number of components Very low current circuits: Meet ALICE TRD requirements Provide high resolving power (nA), fast response, Short circuit protection Two Enfolded Voltage stabilizing Systems: Shunt regulator Provides load regulation Reduces output ripple Software regulation Gives long term stability XXVI Workshop on Recent Developments in HEP M. Vassiliou

  8. Crate 01 Module 01 Card 01 Card Channel 01 Card 02 Channel 02 μCpu . . . . . Channel 03 Card 05 Channel 04 Channel 05 Module 02 Channel 06 Module 03 DCS Board HVDS Architecture • Architecture Similar to ALICE TRD layout XXVI Workshop on Recent Developments in HEP M. Vassiliou

  9. HVDS Specifications

  10. HVD Card Block Diagram • Six shunt regulators • DACs for the regulator reference voltage • Six measurement circuits, each consisting of an ADC with the appropriate signal conditioning circuits for voltage and current measurement. • Six floating auxiliary power supplies. • The micro-controller and the CPLD • The CAN BUS interface (controller and line driver) • RS232 interface • A digital temperature sensor • IP Switches that set the card ID on the CAN BUS XXVI Workshop on Recent Developments in HEP M. Vassiliou

  11. Control Software: Embedded Software Software Regulation: HV Stability ~0.002% /24h Includes protections: Temperature, Current, and Voltage Generates alarm signals Response Time <50ms Performs Self Diagnostics: Hardware Monitoring, Hardware Error Detection 2 Control Interfaces: CAN Interface (PVSS & Final Set-up) RS232 Interface (Development, Debugging, Tests) XXVI Workshop on Recent Developments in HEP M. Vassiliou

  12. DCS: SM HV Control Panel XXVI Workshop on Recent Developments in HEP M. Vassiliou

  13. DCS: HVDS Channel FSM Panel Set: status voltage max (min)_voltage max_current period Monitor: voltage current Open panels ramping alarm history Warnings – Alarms Local Archiving XXVI Workshop on Recent Developments in HEP M. Vassiliou

  14. HVDS Commissioning I XXVI Workshop on Recent Developments in HEP M. Vassiliou 2 Anode + 2 Drift Crates delivered and tested at CERN: 30 Anode + 30 Drift HVD Cards 180+180 Output HV Channels to power 6 TRD Supermodules

  15. HVDS Commissioning II • 1 Backplane • 15 HVD cards • 1 DCS Board • adapted on 1 DCS Auxiliary Card • 8 Auxiliary Power Supply Cards • provide AC power to the isolated channels of the HVDS Cards • 4 LV Power Supplies (Schroff PSM112 for ±12V and PSG105 for +5V) XXVI Workshop on Recent Developments in HEP M. Vassiliou Each crate contains:

  16. HVDS Commissioning III XXVI Workshop on Recent Developments in HEP M. Vassiliou

  17. HVDS Commissioning: HVD Card Image XXVI Workshop on Recent Developments in HEP M. Vassiliou

  18. Performance Tests : Magnetic Field Test XXVI Workshop on Recent Developments in HEP M. Vassiliou Tests performed in the MNP22 Facility at CERN. HV set at -2.4 kV (Drift), 1.8 kV (Anode) B increased from 0 to 220 Gauss Two crate configurations Successful over current test

  19. Magnetic Field Test Results: Drift HVD @ -2.4 kV σ < 15 mV magnet on magnet off XXVI Workshop on Recent Developments in HEP M. Vassiliou

  20. Magnetic Field Test Results: Anode HVD @ 1.8 kV σ < 15 mV magnet on magnet off XXVI Workshop on Recent Developments in HEP M. Vassiliou

  21. Test on the TRD-SM I XXVI Workshop on Recent Developments in HEP M. Vassiliou

  22. Performance TestsLong Term Voltage Stability Test HV set at 1900 V • ΔV (FWHM) < 30 mV • ΔV / V < 1.6 E-5 XXVI Workshop on Recent Developments in HEP M. Vassiliou

  23. Test on the TRD-SM I • 6 anode channels • HV set at 1450 V HVD System XXVI Workshop on Recent Developments in HEP M. Vassiliou

  24. Cosmic Data took at CERN Test on the TRD-SM I “After finalising the assembly of the super module, its performance was tested with cosmics tracks. Three scintillators were arranged so that high multiplicity cosmics events could be recorded with a rate of about two per minute. The drift chambers were filled with an Ar, CO2 (15%) mixture and high voltage was applied by a Master/ Slave distribution system specifically developed at the University of Athens, Greece (drift voltage 1450V, anode voltage 1450 V). “ C. Adler et al. “Construction of the First ALICE TRD Super Module”, GSI Scientific Report 2006 Figure 1: Cosmics tracklets in the sixlayers of stack threeof the super module.The tracklets can be connected toform tracks. A simple reconstruction(clusterization) wasapplied. We show aprojection of the found clusters ontotheplane perpendicular to the z-axis (beamaxis). XXVI Workshop on Recent Developments in HEP M. Vassiliou

  25. Test on the TRD-SM II XXVI Workshop on Recent Developments in HEP M. Vassiliou • HVD system connected with the SM-II • Anode voltage @ 1.45 kV Drift voltage @ -1.5 kV , -1.9 kV • Successful overcurrent test

  26. Test on the TRD-SM II Results σ < 15 mV Drift HVD @ 1900 V Anode HVD @ 1450 V XXVI Workshop on Recent Developments in HEP M. Vassiliou

  27. Summary XXVI Workshop on Recent Developments in HEP M. Vassiliou • A High Voltage Distribution System for the ALICE TRD has been designed and constructed. Four HVDS Crates have been delivered. • The system consists of the hardware, the embedded software and the control software at the supervisory level. • Many tests performed at CERN verified that the system fulfils all the specifications set by the detector designers.

  28. References [1] P. Mantzaridis, A. Markouizos, P. Mitseas, A. Petridis†, S. Potirakis,M. Tsilis, M. Vassiliou, “A High Voltage Distribution System for the ALICE Transition Radiation Detector”, ALICE-INT-2008-006, https://edms.cern.ch/document/901555/1 [2] A. Markouizos, P. Mantzaridis, P. Mitseas, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou, “The ALICE TRD – HV Distribution System”, Proc. of the Workshop on the DCS for the TRD, CERN, November 2007 [3] A. Markouizos, P. Mantzaridis, P. Mitseas, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou, “Performance Tests of the TRD – HVDS” ALICE DCS Workshop, CERN, October 2007, http://indico.cern.ch/getFile.py/access?contribId=17&resId=1&materialId=slides&confId=21162 [4]A. Markouizos, P. Mantzaridis, P. Mitseas, A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou, “Integration of the HV Distribution System to the First TRD Supermodule”, Proc. of the Workshop on the DCS for the TRD, Heidelberg, January 2007. [5] C. Adler et al. “Construction of the First ALICE TRD Super Module”, GSI Scientific Report 2006 http://www.gsi.de/informationen/wti/library/scientificreport2006/PAPERS/INSTRUMENTS-METHODS-39.pdf [6]A. Petridis, S. Potirakis, M. Tsilis, M. Vassiliou, “The TRD HV Distribution System”, ALICE - DCS Workshop, CERN, March 2005, http://alicedcs.web.cern.ch/AliceDCS/Meetings XXVI Workshop on Recent Developments in HEP M. Vassiliou

  29. Thank you! XXVI Workshop on Recent Developments in HEP M. Vassiliou

  30. HVDS Crate Structure

  31. TRD Principles

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