Total Pressure Vacuum Gauges

Jousten, Karl

doi:10.1002/9783527688265.ch13

Cited by 2 publications

(2 citation statements)

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“…The uncertainty on the density is negligible and that on the scattering length a few percent (section 7.1.1). The last column gives the relative response of the vacuum gauge for each gas species with respect to N 2 [30]. The uncertainties on these sensitivities are estimated at about 10%, but are included in the gauge accuracies, which are discussed in section 7. molecule, hitting the surface, to stick on it.…”

Section: Lhc Beam Vacuum Description and Gas Injection Proceduresmentioning

confidence: 99%

“…The warm sections of the LHC beam pipe are equipped with vacuum gauges in order to monitor the pressure constantly. In the regions where the pressure bumps are introduced, two different gauge technologies are utilised: VGPB: cold cathode gauges [30], Pfeiffer vacuum IKR 070, triaxial and VGI: hot cathode gauges [32], custom CERN made.…”

Section: Pressure Measurementmentioning

confidence: 99%

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Beam-induced backgrounds measured in the ATLAS detector during local gas injection into the LHC beam vacuum

Aad,

Aakvaag,

Abbott

et al. 2024

J. Inst.

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Inelastic beam-gas collisions at the Large Hadron Collider (LHC), within a few hundred metres of the ATLAS experiment, are known to give the dominant contribution to beam backgrounds. These are monitored by ATLAS with a dedicated Beam Conditions Monitor (BCM) and with the rate of fake jets in the calorimeters. These two methods are complementary since the BCM probes backgrounds just around the beam pipe while fake jets are observed at radii of up to several metres. In order to quantify the correlation between the residual gas density in the LHC beam vacuum and the experimental backgrounds recorded by ATLAS, several dedicated tests were performed during LHC Run 2. Local pressure bumps, with a gas density several orders of magnitude higher than during normal operation, were introduced at different locations. The changes of beam-related backgrounds, seen in ATLAS, are correlated with the local pressure variation. In addition the rates of beam-gas events are estimated from the pressure measurements and pressure bump profiles obtained from calculations. Using these rates, the efficiency of the ATLAS beam background monitors to detect beam-gas events is derived as a function of distance from the interaction point. These efficiencies and characteristic distributions of fake jets from the beam backgrounds are found to be in good agreement with results of beam-gas simulations performed with the Fluka Monte Carlo programme.

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Section: Lhc Beam Vacuum Description and Gas Injection Proceduresmentioning

confidence: 99%

Section: Pressure Measurementmentioning

confidence: 99%