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Preliminary Results of MD wk46

Preliminary Results of MD wk46. V. Baglin, G. Bregliozzi, P. Chiggiato, J-M. Jimenez, G. Lanza. CERN TE-VSC , Geneva. On behalf of TE-VSC. Fill 1459 – 31th October. 50ns_109b_12_90_12bpi10inj - Trains well separated i.e. no discussion between trains Pressure up to 2e-8 mbar.

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Preliminary Results of MD wk46

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  1. Preliminary Results of MD wk46 V. Baglin, G. Bregliozzi, P. Chiggiato, J-M. Jimenez, G. Lanza CERN TE-VSC, Geneva On behalf of TE-VSC LHC beam commissioning 20 nov 2010

  2. Fill 1459 – 31th October • 50ns_109b_12_90_12bpi10inj - Trains well separated i.e. no discussion between trains • Pressure up to 2e-8 mbar LHC beam commissioning 20 nov 2010

  3. Fill 1459 – 31th October • 50ns_109b_12_90_12bpi10inj - Trains well separated i.e. no discussion between trains • Pressure increases due to ecloud in the 1e-9 mbar region SR at ~ 2 TeV LHC beam commissioning 20 nov 2010

  4. Fill 1459 – 31th October • 50ns_109b_12_90_12bpi10inj - Trains well separated i.e. no discussion between trains • Pressure 4e-9 mbar SR at ~ 2 TeV LHC beam commissioning 20 nov 2010

  5. Fill 1459 – 31th October • 50ns_109b_12_90_12bpi10inj - Trains well separated i.e. no discussion between trains SR at ~ 2 TeV LHC beam commissioning 20 nov 2010

  6. Fill 1459 – 31th October • 50ns_109b_12_90_12bpi10inj - Trains well separated i.e. no discussion between trains • Electron cloud stimulated pressure increases in the kicker intermodule up to 4e-9 mbar SR at ~ 2 TeV LHC beam commissioning 20 nov 2010

  7. Afterscrubbing and MDs of Wk44 and Wk46 LHC beam commissioning 20 nov 2010

  8. Fill 1500 – 19th November • Pressure increases at VGI in A4L1 • But remains lower than 7E-10 mbar SR at ~ 2 TeV Bunch length increases Bunch length decreases during ramp Up to 1 TeV LHC beam commissioning 20 nov 2010

  9. Fill 1500 – 19th November • Only SR desorption • in LSS2 • in LSS3&5 • In LSS6&7 LHC beam commissioning 20 nov 2010

  10. Fill 1500 – 19th November • Some activity in MKIR8 intermodule stimulated by ramp and SR • Start ramp, pressure increase starting from ~ 550 GeV (19:36) • But flattens at 800– 1000 GeV (19:40) SR at ~ 2 TeV Bunch length decreases during ramp Up to 1 TeV Bunch length increases LHC beam commissioning 20 nov 2010

  11. Fill1502 B1=444 Bunches – B2= 60 Bunches – 50ns ATLAS 4E-8 mbar LHC beam commissioning 20 nov 2010

  12. Fill1502 B1=444 Bunches – B2= 60 Bunches – 50ns ALICE 8E-8 mbar LHC beam commissioning 20 nov 2010

  13. Fill1502 B1=444 Bunches – B2= 60 Bunches – 50ns CMS 3E-8 mbar LHC beam commissioning 20 nov 2010

  14. Fill1502 B1=444 Bunches – B2= 60 Bunches – 50ns LHCb 1E-7 mbar LHC beam commissioning 20 nov 2010

  15. Fill1502 B1=444 Bunches – B2= 60 Bunches – 50ns Highest Pressure on LSS3 and LSS6 1E-6 mbar LHC beam commissioning 20 nov 2010

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