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Data Exchange for Vacuum System

Data Exchange for Vacuum System. Rossi – V. Baglin – I. Laugier Pressure measurement Gauges around the LHC. Pressure measurements. UHV measurements with Penning Gauges (VGP) - 10 -4 mbar to 10 -10 mbar Ionisation Gauges (VGI) - 10 -6 mbar to 10 -12 mbar

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Data Exchange for Vacuum System

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  1. Data Exchange for Vacuum System Rossi – V. Baglin – I. Laugier Pressure measurement Gauges around the LHC

  2. Pressure measurements • UHV measurements with • Penning Gauges (VGP) - 10-4 mbar to 10-10 mbar • Ionisation Gauges (VGI) - 10-6 mbar to 10-12 mbar • Both gauges reading are gas dependent (ionisation probability) • VGI more sensitive, more accurate (all gauges in LHC calibrated) • VGP reading depends on electronic cards low range limited to 10-9 or 10-11 mbar • AT/VAC consulting is recommended before using measurements for quantitative studies

  3. Vacuum instrumentation in LHC FOR ALL INTERACTION REGIONS • Gauges up to Q7 (250m from IP) at each sector valve (warm section) • Gauges in the arc at Q15, Q23 and Q31 reading down to 5E-9 mbar but not below

  4. Example of IR8 1.1e-11 5e-12 -21m 1.6E-11 -3m 3e-9 +19m 1.2E-10 +21m 8.5E-11 Sector valves and UHV vacuum gauges

  5. Present status and limitations • VGI: 55 % of VGI around the machine are working • 45 % of VGI • Noisy read-out (cables or power supply current stability …) – 13% • Lack of power supply – 26% • Misfunctioning of power supply – 6% • Consolidation ongoing, with priority to experimental regions • VGP leakage current may give wrong read-out

  6. DIP publication for Vacuum data • Generated from our PVSS application • Few Penning or ionization gauges around Atlas and LHCb are actually published. • Two parameters: • State: ON/OFF + Valid bit • Pressure in mbar as a float number. • Under range gauges have validity bit set with 5 10-9 or 1.1 10-11 mbar as Pressure values.

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