1. [R. Alemany] [CERN AB/OP] [Engineer In Charge of LHC] HWC Workshop (19.03.2009) Consolidation and major changes that have impact on the powering circuits

2. I. Major changes Type of work / Type of sectorELQAELQA CRYOCRYO QPSQPS PCPC PICPIC PTPT Systems/ PT Details 1New overpressure relief valves installation (warm sectors) NYNNNN Will be done during PT  impact on test schedule 2New QPSYaYaNYNNYCommissioning to be integrated in the PT procedures 3Magnet exchangedYNNNNYRe-commission all the circuits concerned 4Bus Bar repair in connection cryostat (risk of shorts)  S56 (&S34 preventive t.b.c.) YNNNNYAdapt procedures (check circuits integrity) 5S34 (ARC+LSS+IT)  1+2+3 (special sector) YYYYbYbNYS34 is a new sector to be fully commissioned 6S12 & S67 (ARC+LSS+IT)  1+2+3YYYNNYRe-commission all the circuits concerned 7S56 (ARC+LSS+IT)  1+2+4YYYNNYAdapt procedures + re-comm. mains 8S23 & S45 (ARC T<100 K)  2YNYNNYRe-commission main circuits 9S81 & S78 (T < 5 K)  2YNYNNYRe-commission main circuits QPS Individual System Test (IST), PC IST, PIC IST PT: Powering Test a. Only Mains; b. PC Short Circuit Heat Run because of Sep19 2 May go > 100 K May go ~ 100 K IST

3. Miscellaneous Type of work / Type of sectorELQAELQA CRYOCRYO QPSQPS PCPC PICPIC PTPT Systems/PT Details 10Relocation of UPS and electronics from UJ76 to the TZ76 (PIC, WIC, PC, UPS) NNNNYYNormal procedures for PIC 11AUG issues + non conformities  f(issue, non conformity) NNYYYNAdapt procedures to test that everything is conform (H. Thiesen talk) 12S34 missing corrector in SSS, should be documented in the as- built database Systems concerned: FIDEL (TF generation), QPS (inductance calculation), DB, drawings 13Field quality of the newly installed magnets should be extracted using WISE to provide ABP with a up-to- date status of the machine Systems concerned: FIDEL must be updated, ABP simulations 3 IST

4. PC Type of work / Type of sectorELQAELQA CRYOCRYO QPSQPS PCPC PICPIC PTPT Systems/PT Details 14 Short Circuit Test (Heat Run) in S34 NNYYNN 15Installation of DC contactors for 8 RQS and for 8 RTQX1 power converters to improve protection NNNYNYCircuits concerned/Normal procedures (PIC, PCC, PNO) 16Water Cooled Cables repairs (UA63,UA43) YNNYNYCircuits concerned/Adapt procedures (cables IST + short circuit test on PCs) 17Exchange of DC cables for circuits powered from UJ33 (RQT4/5.R3) YNNY WICWIC YCircuits concerned/Normal procedures (+heat run) 18Desintallation/reinstallation of ALICE correctors YNNY WICWIC YCircuits concerned/Full commissioning 4 IST

5. PIC / WIC Type of work / Type of sectorELQAELQA CRYOCRYO QPSQPS PCPC PICPIC PTPT Systems/PT Details 19Modifications of the PIC (BIC interface modification - lab test) NNNNNYCircuits concerned/Normal procedures for PIC 20Modification of the WIC (Fast Module activation) NNNN WICWIC YCircuits concerned/Normal procedures 21Software interlock ACCESS-PICNNNNYNPIC-SIS-ACCESS dedicated test 5 IST

6. CRYO Type of work / Type of sectorELQAELQA CRYOCRYO QPSQPS PCPC PICPIC PTPT Systems/PT Details 23Thermo switch a (thermo switches on top of leads to mitigate the risk associated with soft. interlocks) NNNYYN 24Modification of the cryogenic link for 600A circuits powered from UJ33 YYNNNYCircuits concerned/Normal procedures a Thermo switches will be installed everywhere but only connected for the high current circuits in s78 and sector 81 (other later, due to short time for cabling) 6 IST

7. CRYO Type of work / Type of sectorELQAELQA CRYOCRYO QPSQPS PCPC PICPIC PTPT Systems/PT Details 25Consolidations on Stand-alone, priority: MQY and MQM, the level gauges will be replaced to improve the control of the Helium level NYNNNN 26Cryogenic cabling NYNNNN 27Repair of Y Line, in sectors 12 and 34 (S78 & S81if warms) NYNNNN 28Installation of Cu strips + thermometers in ITL5 and IR (outside of the cold mass in the insulation vacuum) NYNNNN 29Modification to DFBsNYNNNN Install additional pressure switches for the dry air system Improve LHe level regulation for DFBAC LCM Improve the configuration of the safety valves discharge outlet Add heaters on top plates of DFBXs to avoid heavy condensation 7 IST

8. New relief valve scheme Chamonix 09 V. Parma Quench valves on cold mass circuit QV  DN50 Insulation vacuum pressure relief devices SV  DN90 Vacuum barrier 8

9. Types of valves DN200 Chamonix 09 V. Parma Replacing clamps with spring-loaded clamps 9

10. nQPS Suspicious splice detection (UTH = 300 µV, 10 s) Detection of symmetric quenches Voltage to earth detection K. Dahlerup-Petersen 10

11. Exchange of DC cables for circuits powered from UJ33 (RQT4/5.R3) 11

12. Exchange of DC cables for circuits powered from UJ33 (RQT4/5.R3) 12

13. Exchange of DC cables for circuits powered from UJ33 (RQT4/5.R3) 13