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ALICE TPC – Status Report

ALICE TPC – Status Report. Project leader: Peter Braun-Munzinger, GSI Darmstadt Deputy project leader: Johanna Stachel, Heidelberg Technical coordinator: Peter Gl ä ssel, Heidelberg. Bergen D. R ö hrich D ata acquisition Bratislava B. Sitar 1/2 IROC series production

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ALICE TPC – Status Report

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  1. ALICE TPC – Status Report Project leader: Peter Braun-Munzinger, GSI Darmstadt Deputy project leader: Johanna Stachel, Heidelberg Technical coordinator: Peter Glässel, Heidelberg BergenD. Röhrich Data acquisition BratislavaB. Sitar 1/2 IROC series production CERN T. Meyer Field cage CERN L. Musa Electronics CopenhagenB.S. Nielsen Laser system KrakowM. Kowalski Simulations Darmstadt GSI H.R. Schmidt ROC engineering, prototyping, series production,simulations Darmstadt TU H. Oeschler Electronics testing Frankfurt R. Renfordt Electronics testing,installation Heidelberg KIP V. Lindenstruth Data acquisition, HLT Heidelberg PIJ. Stachel Electronics, engineering, IROCproduction,OROC production Lund H.A. Gustafsson Electronics ALICE TPC Status, Meeting with LHCC referees 30.6.03

  2. Field cage Readout chambers Laser system Cooling system Gas system Readout electronics Schedule Outline ALICE TPC Status, Meeting with LHCC referees 30.6.03

  3. TPC Field Cage Overview • Inner and outer Isolation vessels • Aluminum End Plates housing ROC’s • Field defining system: strips supported by rods ALICE TPC Status, Meeting with LHCC referees 30.6.03

  4. Field Cage Parts, Overview 5560 5000 OCV Isolation volume OFV Central membrane End wheel Drift volume IFV Isolation volume cone ICV Central drum ALICE TPC Status, Meeting with LHCC referees 30.6.03

  5. Field Cage: Mounting Rod Supports ALICE TPC Status, Meeting with LHCC referees 30.6.03

  6. Field Cage: Rod Assembly ALICE TPC Status, Meeting with LHCC referees 30.6.03

  7. Resistor Rod status Completed: • Gas-cooled prototype • Contacts ok • Still a few improvements needed • Rather complicated to produce • Needs separate CO2gas system • Water-cooled prototype • Full prototype end July03 • HV tests both successful • Resistor tests: stability, overvoltage tolerance • Water-cooled rod preferred solution In progress: • Tooling and pieces for production (water cooled) Concerns: • Tight schedule (first 2 rods needed Dec03), manpower ALICE TPC Status, Meeting with LHCC referees 30.6.03

  8. Resistor Rod Cooling 10 Resistor Ceramic pipe Resistor G10 Separator Cu-heat bridges gnd 100 kV • gas cooled • water cooled • High-resistivity water insulation volume (gas) ALICE TPC Status, Meeting with LHCC referees 30.6.03

  9. Field Cage Inner Drum • Delivered by Fischer • Al strips (ground) prepared ALICE TPC Status, Meeting with LHCC referees 30.6.03

  10. The Inner FC vessel is being rebuilt What happened: • Leak test: 25 Feb03 --> leaks at glue joint between composite and flange • Ultrasonic test: 27 Feb03 --> faulty glue bonds • First repair by Fischer: 10-14 Mar03, only on outer joint • Decision to rebuild: 24 Apr03, order 6 May03 Consequences: • Repeat work: • Assembly at CERN Jul03 • Leak test, guard rings, vias, • Resistor chain, rod supports • Total delay 7 months, • Ready to install rods Dec03 • Complete FC equipment Jul04 Defective vessel ALICE TPC Status, Meeting with LHCC referees 30.6.03

  11. Impact of FC Schedule on Pre-Installation • Pre-commissioning of TPC shortened from 13 to 6 month 3 month float 7 months ALICE TPC Status, Meeting with LHCC referees 30.6.03

  12. Field Cage: Central Electrode ALICE TPC Status, Meeting with LHCC referees 30.6.03

  13. Completed: Modification of stretching machine Stock of 6m wide glued mylar foil Stretching and rupture test electrode frames and manipulation tool Not started yet: Production of 3 electrodes (not earlier than needed) Field Cage: Central Electrode ALICE TPC Status, Meeting with LHCC referees 30.6.03

  14. Field Cage Status Summary • Completed: • Mounting rod supports on OFV • Inner cones • Central drum • In progress: • Gluing standard rods • Gluing laser rods • Not started yet: • Rebuild of IFV (assembly at CERN Jul03) • Testing and equipment of new IFV • Load test on outer insulation volume • Rebuild of one inner cone (change of dimensions at muon absorber) ALICE TPC Status, Meeting with LHCC referees 30.6.03

  15. Service Support Wheel Carries FEE and services • Completed: • Design of frame and services • Prototype sectors for FEE assembly trial • In progress: • Construction • Design of details for connection to ITS services and beam pipe • Concerns: • Installation of FEC’s difficult, tight space ALICE TPC Status, Meeting with LHCC referees 30.6.03

  16. Front End Card Installation FEC in Cu sandwich 6 cables per FEC connectors with locks • Model setup at GSI to study FEE installation • development of tool for cable insertion, connector locking/ unlocking IROC ALICE TPC Status, Meeting with LHCC referees 30.6.03

  17. IROC Production Bratislava • Quality good • Very uniform wire spacing • Very uniform wire tension • Leak and gain tests lagging behind due to (trivial) technical problems, mostly solved already • Production running smoothly now at 2 ch/month not on critical path ALICE TPC Status, Meeting with LHCC referees 30.6.03

  18. OROC Production Heidelberg/GSI • Initial problems with segmented pad planes solved, but still more difficult than anticipated (2 padplanes out of 14 have to be redone) • Leak rate lower per area than IROC • Each chamber is surveyed, geometry within specs • Production running at 1 ch/week now ALICE TPC Status, Meeting with LHCC referees 30.6.03

  19. OROC Production Heidelberg/GSI Survey of planarity and pad geometry ALICE TPC Status, Meeting with LHCC referees 30.6.03

  20. OROC Production Heidelberg/GSI Coarse and fine adjustment of a wire plane ALICE TPC Status, Meeting with LHCC referees 30.6.03

  21. OROC Production Heidelberg/GSI Measuring wire tension ALICE TPC Status, Meeting with LHCC referees 30.6.03

  22. OROC Production Heidelberg/GSI Chamber in test setup ALICE TPC Status, Meeting with LHCC referees 30.6.03

  23. ROC Status Summary Completed: • Assembled: IROC 27, OROC 12 • Tested: IROC 18, OROC 5 In progress: • Production rates: OROC 1 ch/week, IROC 2 ch/mo • Expect to finish early 2004 Concerns: • OROC: gluing of pad plane (4 sectors) more difficult than anticipated • Testing in Bratislava not yet fully operational ALICE TPC Status, Meeting with LHCC referees 30.6.03

  24. LaserSystem Completed: • Micro-mirrors: delivered, tested and selected • Preparation of laser rod segments and mirror holders • Tooling for gluing rods In progress: • Assembly of laser rods (till Sep03) • Procurement/construction of optics elements Concerns: none ALICE TPC Status, Meeting with LHCC referees 30.6.03

  25. Electronics Cooling FEE cooling • 27 kW to be removed • System design nearly completed, draft document exists • PRR in fall ROC padplane thermal screen ALICE TPC Status, Meeting with LHCC referees 30.6.03

  26. TPC Gas System In progress: • System for drift gas Ne/CO2 (90/10) • Construction nearly finished, commissioning till Dec03 • Connection to pre-installation site SXL2 (existing lines) Not yet started: • CO2 for insulation volumes: still to be done • very simple in case of water cooled resistor rod Concerns: none ALICE TPC Status, Meeting with LHCC referees 30.6.03

  27. TPC PASA • Final submission 27 May03 • engineering sample 500 chips Sep03 • rest of production (40,000 chips) Jan04, testing Feb-Jul04 * * typical 12 pF, slope 16.5 e/pF ALICE TPC Status, Meeting with LHCC referees 30.6.03

  28. High Occupancy events from Cosmics ALICE TPC Status, Meeting with LHCC referees 30.6.03

  29. ALTRO digital tail cancellation and baseline restoration • PG: ALICE TPC Status, Meeting with LHCC referees 30.6.03

  30. Front-end Card final version 128 ch ALICE TPC Status, Meeting with LHCC referees 30.6.03

  31. Front-end Card Status Completed: • Improved features • EEPROM card id • Improved Front-end Bus design: multilayer-flexible instead of cable • Geographical address • Assembly of prototype • Standalone tests In progress: • Adaptation of cooling plates • Characterization with ROC • Test equipment • Production of 4500 FEC Nov03-Aug04, test Apr04-Nov04 Concerns: tight schedule ALICE TPC Status, Meeting with LHCC referees 30.6.03

  32. Readout Control Unit (RCU) Completed: • Production of prototype RCU-2 (small series for test setups) • PCI-card, problems to get them to work reliably • Final design (standalone RCU): motherboard layout done In progress: • Solve RCU-2 problem (fall-back RCU-1, decision Jul03) • Final design (standalone): • DCS/Trigger cards (common for TPC/TRD) under test • FPGA firmware till end Aug03 • System tests from Sep03 Not started yet: • Production (216 cards + spares) Apr04 - Jul04 • Testing Aug04 - Mar05 Concerns: tight schedule ALICE TPC Status, Meeting with LHCC referees 30.6.03

  33. Schedule Overview ALICE TPC Status, Meeting with LHCC referees 30.6.03

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