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Vacuum at F11 and the Interaction Points

Vacuum at F11 and the Interaction Points. Ron Moore FNAL. F11 vacuum and CDF proton halo losses – store 1289. before ferrite replacement @ F11 pressure and losses rise and fall. p intensity. F11 pressure. CDF PHSM. CDF LOSTP. F11 vacuum and CDF proton halo losses– store 1486.

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Vacuum at F11 and the Interaction Points

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  1. Vacuum at F11 and the Interaction Points Ron Moore FNAL TeV Halo Meeting – 3 July 02

  2. F11 vacuum and CDF proton halo losses – store 1289 before ferrite replacement @ F11 pressure and losses rise and fall p intensity F11 pressure CDF PHSM CDF LOSTP

  3. F11 vacuum and CDF proton halo losses– store 1486 after ferrite replacement @ F11 pressure reduced, no dramatic rise losses do not rise F11 temperature F11 pressure CDF LOSTP

  4. D0 Pressure Profile FromMike McGee’s Simulation One half of IR D0IG01 pressure 2.4*10-9 torr Average pressure = 1.26*10-8 torr

  5. CDF Pressure Profile FromMike McGee’s Simulation One half of IR B0IG01 pressure 2.5*10-10 torr Average pressure = 1.22*10-8 torr

  6. D0 outgassing rate measured = 7.3*10-9 torr*liter/sec expected = 29*10-9 torr*liter/sec CDF outgassing rate measured = 7.1*10-9 torr*liter/sec expected = 29*10-9 torr*liter/sec Both outgassing rates 1/4 the expected rates

  7. Summary • Replacing ferrite rods improved vacuum @ F11 and eliminated CDF proton loss bump • Expected average pressure @ IPs  1.2*10-8 torr • But, measured outgassing rates are 1/4 expected • Models are being reexamined • Vacuum at IPs likely better than initially believed • IPs are not “hot spots” of poor vacuum R. Moore - FNAL

  8. Proton halo over past 4 months Proton loss rates from experiments divided by narrow-gate intensity D0 CDF

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