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ALICE TPC field cage status

This document presents a comprehensive overview of the status and developments related to the TPC field cage as discussed in the May 2004 meeting in Sardinia. Key updates include the completion of muon side strips, installation of 4-wire Pt 1000 temperature sensors, calibration procedures, and high voltage test results. It covers the final assembly of resistor rods, installation of connectors, and ongoing testing to ensure functionality and safety. The report concludes with an outlook on future installations and tests, emphasizing the commitment to excellence in maintaining equipment integrity.

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ALICE TPC field cage status

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  1. ALICE TPC field cage status Sardinia May 2004 Michael Hoch Cern-TA2

  2. Field Cage Feb. 04 Strips on the muon side completed

  3. Temperature sensors inside the volume • 4-wire Pt 1000 sensors purchased • 50 pieces with 1m wire • Calibrated to two calibr. reference pt1000 • (±3mK at 20 degree) • Calibration range between ~7- 25 degree • Residuals fit by Danilo -> ±10mK

  4. Shaft side temperature sensors • Glued on to the skirt of the 18 sectors

  5. Muon side temperature sensors • 4 sensors at the inner cylinder

  6. Shaft side connectors and feed-troughs • Pt 1000 • Skirt supply • Last resistors guard ring chains • Last resistors R-rods • Last strip supply

  7. Electrical connections inside

  8. Map of all connections on the endplate

  9. Field Cage March 04 Once more HV test (1500V between strips) & cleaned -Muon side completed-

  10. Displacement rails mounted turning clamp

  11. Field cage turn over

  12. Field cage turn over

  13. Resistor rod RR final assembly

  14. Resistor selection Resistor dispersion results in a field distortion of maximal 40mm (presented by Danilo; status field cageFeb. 04)

  15. Resistor Rods shaft side

  16. Resistor Rods shaft side Hooks on the outlet side >> << Resistor Rod outlet on the endplate

  17. Resistor rod shaft side HV tests • 1500V between hooks • 15kV between Al-guard rings • 120kV in the test box

  18. Resistor rod shaft side HV tests

  19. Rod installation

  20. Laser system control Laser beam mapping by Borge Cross checked by Rainer

  21. central membrane • 0.8mm wire connecting the outer and inner CE-flange • Conductive glue -> CE-flange-Al-Mylar foil

  22. Potential strips shaft side

  23. visit from GSI

  24. Shaft side strips finished

  25. I-bar survey system tests

  26. I-bar survey: BCAM system test Bicam system tests with Panos Christakoglou

  27. Outlook: • Installation of 18 pt1000 inside the volume • Electrical connection/ feed troughs • Test HV: • 1500V between each strip • 120kV • Cleaning of the volume • Installation of external temperature sensors • Turning of the field cage, closure of the volume • He & final integral leak test • Installation of the charge to the sliding feeds

  28. Thank you for your attention TPC meeting Sardinia May 2004 Michael Hoch CERN TA2

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