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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

Data Exchange for Vacuum System

Rossi – V. Baglin – I. Laugier

Pressure measurement

Gauges around the LHC


Pressure measurements
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


Vacuum instrumentation in lhc
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


Example of ir8
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


Present status and limitations
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


Dip publication for vacuum data
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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