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LHC HARDWARE COMMISSIONING REVIEW 11-13 May 2005 CRYOGENIC VACUUM SYSTEM

LHC HARDWARE COMMISSIONING REVIEW 11-13 May 2005 CRYOGENIC VACUUM SYSTEM. Paul Cruikshank for AT/VAC. Outline. Cryogenic vacuum system layout Leak testing sequence Failures Summary. Cryogenic Vacuum System. sector 7-8. L8. R7. COLD BEAM VACUUM = 6 SUBSECTORS

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LHC HARDWARE COMMISSIONING REVIEW 11-13 May 2005 CRYOGENIC VACUUM SYSTEM

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  1. LHC HARDWARE COMMISSIONING REVIEW11-13 May 2005CRYOGENIC VACUUM SYSTEM Paul Cruikshank for AT/VAC

  2. Outline • Cryogenic vacuum system layout • Leak testing sequence • Failures • Summary Hardware Commissioning Review, 11-13th May 2005

  3. Cryogenic Vacuum System sector 7-8 L8 R7 COLD BEAM VACUUM = 6 SUBSECTORS CRYOMAGNET INSULATION VACUUM = 14 + 5 SUBSECTORS Hardware Commissioning Review, 11-13th May 2005

  4. Cryogenic Vacuum System - AT/VAC tunnel activities • Individual System Tests (during LHC installation) • Leak testing of beam vacuum and cryostat vessel • Installation & commissioning of vacuum instrumentation & controls • HC tests • Leak & pressure test of cryomagnet helium circuits • Collaboration AT, AB, TS Departments • Documentation • Leak test procedures exist but details are missing • The pressure test ‘owner’ needs to defined • Manpower • Baseline activities – 1 technical engineer per Sector (VAC staff) 2 teams of 2 persons per Sector (S105) • Intervention teams – depends on failure rates (S105 or VAC staff). • A ‘piquet’ service is not foreseen Hardware Commissioning Review, 11-13th May 2005

  5. Cryogenic vacuum system-leak testing • What needs to be leak tested ? LT1) Welds between insulation vacuum & beam vacuum LT2) Elastomer joints between air & insulation vacuum LT3) Welds between helium lines & insulation vacuum A) Low pressure leak test B) Final leak test combined with pressure test LT4) Elastomer joints between air & insulation vacuum (W bellows only) In theory, only the new joints created in the tunnel need to be leak tested, but LT3 globally tests ins. and beam vacuum systems. Hardware Commissioning Review, 11-13th May 2005

  6. LEAK TESTING DURING INSTALLATION & HC eg IR8L INNER TRIPLET Hardware Commissioning Review, 11-13th May 2005

  7. Cryogenic vacuum system- leak testing sequence • Planned for success…. Hardware Commissioning Review, 11-13th May 2005

  8. Cryogenic vacuum system- failure impact As planned Failure without impact Failure with impact Hardware Commissioning Review, 11-13th May 2005

  9. Cryogenic vacuum system - failures • An ES (to be published) summaries vacuum failures scenarios and their consequences. • To recover from a failure, time needs to be allocated to – localise the fault, intervene, repair, return to test conditions, retest. Examples: Replace a BPM button = 1,1,4,4,1 = 11 hrs Repair an interconnect he leak = 4,1,8,8,4 = 27 hrs Repair a cold mass leak before cooldown = 4,1,?,8,4 Repair a cold mass leak after cooldown = 4,1,?,8,4 + WU + CD • Unforeseen interventions on the cryogenic vacuum system may be required due to other system failures eg busbar repair Hardware Commissioning Review, 11-13th May 2005

  10. Sector 8-1 leak testing –the goalposts are moving ! • The sector 8-1 will be installed with discrete magnet strings. 6 out of every 8 magnet interconnects will be performed. MB+MB+MB+SSS+MB+MB+MB • All leak testing could be left until the arrival and interconnection of the missing SSS (Dec 05). The alternatives need to be discussed….. could these discrete strings be leak and pressure tested independently from the QRL (early startup, quality feedback, etc) ? Hardware Commissioning Review, 11-13th May 2005

  11. Summary • Leak testing of the cryogenic vacuum system straddles the end of installation and the start of HC. • Leak testing resources are foreseen via S105 – but based on planning v1.7 • Documentation is not yet complete • Failures due to leaks, instrumentation and utilities are possible during the HC. • Leak failures which require magnet replacement and/or warming of cold magnets will have the biggest time impact • There is no contingency in the baseline planning for leak failures • A vacuum piquet service is not (yet) foreseen during HC • The Sector 8-1 leak testing sequence should be reviewed Hardware Commissioning Review, 11-13th May 2005

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