1 / 6

Vacuum Data Exchange at LHC: Instrumentation & Calibration Updates

Explore pressure measurement gauges used in the Large Hadron Collider (LHC), including UHV and Penning Gauges. Get insights on calibration, current status, and limitations to optimize vacuum system efficiency. Consult with AT/VAC experts for accurate quantitative studies.

berke
Télécharger la présentation

Vacuum Data Exchange at LHC: Instrumentation & Calibration Updates

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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.

More Related