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Vacuum Conditions April 2012: CMS, ALICE, LHC G. Lanza , V. Baglin, G. Bregliozzi CERN TE-VSC-LBV

Vacuum Conditions April 2012: CMS, ALICE, LHC G. Lanza , V. Baglin, G. Bregliozzi CERN TE-VSC-LBV. CMS after the intervention ALICE layout and pressure behavior LHC average performance. CMS. CMS. Fill 2257 - 27/10/11 1380 b, 1.5E11ppb. Fill 2516 - 15/04/12 1092b, 1.32E11 ppb.

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Vacuum Conditions April 2012: CMS, ALICE, LHC G. Lanza , V. Baglin, G. Bregliozzi CERN TE-VSC-LBV

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  1. Vacuum Conditions April 2012: CMS, ALICE, LHC G. Lanza, V. Baglin, G. Bregliozzi CERN TE-VSC-LBV CMS after the intervention ALICE layout and pressure behavior LHC average performance LHC LBS – 16th April 2012

  2. CMS LHC LBS – 16th April 2012

  3. CMS Fill 2257 - 27/10/11 1380 b, 1.5E11ppb Fill 2516 - 15/04/12 1092b, 1.32E11 ppb 18 m Right 10-9 18 m Right LHC LBS – 16th April 2012

  4. CMS Fill 2516 - 15/04/12 • Low pressure at 18 m right: • RF insert exchange • Beam pipe NEG activation • NEG cartridge activation 18 m Right LHC LBS – 16th April 2012

  5. CMS Fill 2516 - 15/04/12 • Low pressure at 18 m right: • RF insert exchange • Beam pipe NEG activation • NEG cartridge activation 18 m Right LHC LBS – 16th April 2012

  6. CMS Fill 2516 - 15/04/12 Effect of the synchrotron radiation 18 m Right LHC LBS – 16th April 2012

  7. ALICE LHC LBS – 16th April 2012

  8. ALICE • 44m all NEG coated except the instrumentation domes Vacuum chamber MBXWT Vacuum chamber MBXWT IP2 Stainless Steel Stainless Steel Stainless Steel Copper Beryllium RB24/1-2-3 VACUUM CHAMBER  Central Beam Pipe RB26 ALICE beam vacuum chamber (conical) LHC LBS – 16th April 2012

  9. Vacuum Layout of ALICE 19m 9m MANUAL VALVE 19m 4m ANULAR IONIC PUMP

  10. ALICE 19m 10-9 LHC LBS – 16th April 2012

  11. Sector A4L2: left of ALICE D1 Φ 800 chambers TDI LHC LBS – 16th April 2012

  12. ALICE D1-D1

  13. ALICE D2-D2 Φ 800 chambers D2 D1 1.35E+11 ppb 1.22E+11 ppb Fill 2516 - 15/04/12 LHC LBS – 16th April 2012

  14. ALICE D2-D2 Φ 800 chambers D2 D1 LHC LBS – 16th April 2012

  15. LHC LHC LBS – 16th April 2012

  16. LHC

  17. Summary • The CMS pressure is under 1x10-9 mbar • ALICE beam pipe pressure is below 1x10-9 mbar . • The sector A4L2 and A4R2 are still conditioning. • LHC average pressure behave as expected LHC LBS – 16th April 2012

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