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Other systems – what needs to be done? Repair and reinstallation of other systems

Repair of 34 Chamonix 2009. Other systems – what needs to be done? Repair and reinstallation of other systems.

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Other systems – what needs to be done? Repair and reinstallation of other systems

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  1. Repair of 34 Chamonix 2009 Other systems – what needs to be done? Repair and reinstallation of other systems Acknowledgments: O.Aberle – F.Bertinelli – J.C.Billy - O.Capatina - J.Casas - L.Ceccone- S.ClaudetJ.Coupard- K.Dahlerup - R.Denz - K.Foraz- J.J.Gras- V.Parma - A.Perin– M.PoyerR.Shmidt - H.Thiesen – A.Vergara M.Solfaroli/B.Bellesia

  2. Repair of 34 General activities S34 activities M.Solfaroli/B.Bellesia - Repair of 34

  3. The new QDS system See Reiner’s presentation (session 04) M.Solfaroli/B.Bellesia - Repair of 34

  4. The new valves See Vittorio’s presentation (session 04) Courtesy M. Kappinen, M. Duret M.Solfaroli/B.Bellesia - Repair of 34

  5. Jacks consolidation See Ofelia’s presentation (session 04) M.Solfaroli/B.Bellesia - Repair of 34

  6. Stand Alone Magnets See Serge’s presentation (session 01) Improvement of level sensors in the stand alone magnet to increase the reliability by installation of a flexible capillary with a bigger diameter and without low point M.Solfaroli/B.Bellesia - Repair of 34

  7. DFBs Install electrical protections in front of current leads Improve the configuration of the safety valves discharge outlet See Katy+Julie’s presentation (session 05) Install mechanical protection for DFBM & DFBA links Install additional pressure switches for the dry air system M.Solfaroli/B.Bellesia - Repair of 34

  8. Collimators Full phase 1 system would be installed for 2009, removing limits for b*, luminosity, cleaning efficiency, protection and risks for collimator lifetime (early series production) Completion phase 1 See Katy+Julie’s presentation (session 05) Consolidation ring skew/vertical inox cages Consolidation ring horizontal inox cages Consolidation TL inox cages M.Solfaroli/B.Bellesia - Repair of 34

  9. Repair of 34 Incident related activities S34 activities Maintenance and Repairs M.Solfaroli/B.Bellesia - Repair of 34

  10. Racks re-installation M.Solfaroli/B.Bellesia - Repair of 34

  11. PC 60A - problems 4 converters showed traces of oxidation (Cell 28). Their DC connectors on DC cable side have to be changed • 3 converters have required repairs: • RCBH30.R3B2 (dead capacitor due to cold?) • RCBH24.R3B2 (Overvoltage through current lead voltage taps) • RCBV24.R3B1(Overvoltage through current lead voltage taps) The other 87 converters have been fully re-tested and are operational M.Solfaroli/B.Bellesia - Repair of 34

  12. PC 60A – re-commissioning Crates re-installation and re-connection when magnets installation is finished Re-testing: PCC – PNO.a1 – PNO.d1 This activity is included in the powering test M.Solfaroli/B.Bellesia - Repair of 34

  13. CRYO inst - problems All systems have been tested Only one card was blown out, most likely because of a small piece of MLI creating an internal short circuit M.Solfaroli/B.Bellesia - Repair of 34

  14. CRYO inst - re-commissioning Visual inspection while interconnecting Check of the signal cabling Crates re-installation and re-connection when magnets installation is finished Coherency tests M.Solfaroli/B.Bellesia - Repair of 34

  15. QPS racks - problems • Quench Detector • All of them have been removed • All at right of D-area have been cleaned • Analysis to be done in all the others • Quench Heater Power Supply • Only QHPS in the D-area have been removed • Some of them have been analyzed and many have seen a dielectric breakdown at the level of the input diode bridge for charging of the capacitor • No clear explanation (due to condensation inside?) • They can be easily repaired • Removal of the others depending on the situation M.Solfaroli/B.Bellesia - Repair of 34

  16. QPS racks - re-commissioning Crates re-installation and re-connection when magnets installation is finished IST Heater Charging and Firing This activity is considered as part of the powering test M.Solfaroli/B.Bellesia - Repair of 34

  17. Vacuum racks - problems No problem was found Electronics re-tested and operational M.Solfaroli/B.Bellesia - Repair of 34

  18. Vacuum racks - re-commissioning Crates re-installation and re-connection when magnets installation is finished M.Solfaroli/B.Bellesia - Repair of 34

  19. Beam Instrumentation Beam Loss Monitor Re-testing the whole sector (with radioactive source) Beam Position Monitor Tests to be done during the interconnection phase • BGI - BCT - BTV • Already commissioned • Routine inspection M.Solfaroli/B.Bellesia - Repair of 34

  20. PC - Short Circuit 24h run Power Converter PO requested a check of the converters of the A34 to check whether they have been damaged by overcharge (as for some 60A) P3 P4 ARC DSLC • PC connected: • 22 x 600A • PC connected: • 3 x 13kA • 8 x 6kA • 25 x 600A No PC directly connected • PC connected: • 94 x 60A • 16 x 120A M.Solfaroli/B.Bellesia - Repair of 34

  21. PC - Short Circuit 24h run • PC (13kA – 6kA – 600A – 120A) • Set-up of the short circuits at the level of the cables • 24 hours heat run • Short circuit removal • (Short Circuit test in the UJ33 was performed at operational current profile – sensitive area) M.Solfaroli/B.Bellesia - Repair of 34

  22. Repair of 34 S34 activities Incident related activities Maintenance and Repairs M.Solfaroli/B.Bellesia - Repair of 34

  23. Beam Instrumentation RU.L4 removal (?) Broken internal resistance (manufacturing problem) • BSRT (Synchrotron Light Telescope) • Control cable being pulled • Upgrade of the alignment control engine of the optic system • Change and regulation of the optic bench • Not mandatory for operating the machine at 5TeV • Feasibility on the LHC planning to be checked M.Solfaroli/B.Bellesia - Repair of 34

  24. The DSLC – problem Cable layout Layer 1 (inner) Wires 1-10: Layer 2: 11-26: Layer 3 (outer layer) 27-48: DSLC input 3-4 27-28 5-6 29-30 7-8 31-32 9-10 33-34 11-12 35-36 13-14 37-38 15-16 39-40 17-18 41-42 19-20 45-46 21-22 43-44 23-24 25-26 Courtesy of A.Perin M.Solfaroli/B.Bellesia - Repair of 34

  25. The DSLC Courtesy of A.Perin M.Solfaroli/B.Bellesia - Repair of 34

  26. The DSLC – problem Courtesy of A.Perin M.Solfaroli/B.Bellesia - Repair of 34

  27. The DSLC – solution Compression and fixing of the flexible part of the DSLC link in order to avoid displacement which is responsible for the heat load M.Solfaroli/B.Bellesia - Repair of 34

  28. Re-cabling of RQT4.R3 -RQT5.R3 The commissioning of the two magnets showed the impossibility to keep the nominal current in the circuits due to the increase of T of DC cables and magnets. This effect produces a significant variation of the resistance of the circuits with the consequence that the PC is not longer able to provide the nominal current Engineering Change Order EDMS n.938480 M.Solfaroli/B.Bellesia - Repair of 34

  29. Re-cabling of RQT4.R3 -RQT5.R3 The solution proposed is to pull additional DC cables from the PC to the magnets in order to reduce the resistance of the circuits and limit the DC cables temperature The present modification is not mandatory for the 5TeV LHC operation M.Solfaroli/B.Bellesia - Repair of 34

  30. Re-commissioning of RQT4 – RQT5 Electrical Quality Assurance toverifies the integrity of the circuits Polarity Check to verify the correct DC cabling 24h heat run to validate the electrical circuits (ventilation and equipments have been already validated in the previous campaign) M.Solfaroli/B.Bellesia - Repair of 34

  31. Resume • GENERAL ACTIVITIES • (Katy and Julie will better come back to this on Session 05) • SECTOR 34 • Racks (QPS, VAC, PC, CRYO) re-installation and re-commissioning • BI commissioning • BSRT regulation and optic bench change (not mandatory) • RU.L4 replacement (?) • PC short circuit 24h heat run • DSLC • Ongoing • RQT4 – RQT5 • Re-cabling - Ongoing • Re-commissioning M.Solfaroli/B.Bellesia - Repair of 34

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