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Electron Cloud Observations and Pressure Insights during CERN ATLAS, CMS, and LHCb Fills

This report details the findings from multiple fills at CERN involving the ATLAS, CMS, and LHCb experiments, focusing on electron cloud observations and pressure changes in various locations relative to the IP (Interaction Point). Key measurements include pressure readings post-collision, electron cloud presence detected at certain distances, and historical signal patterns noted during previous fills. The data contributes to a better understanding of pressure fluctuations and electron behavior during high-energy collisions, crucial for optimizing collider performance.

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Electron Cloud Observations and Pressure Insights during CERN ATLAS, CMS, and LHCb Fills

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  1. Fill 2124 V. Baglin (19/09/11) CERN TE-VSC, Geneva 1. 2. 50ns_1380b+1small_1318_39_1296_144bpi Bunch intensity 1.38E11

  2. 50ns_1380b+1small_1318_39_1296_144bpi Bunch intensity 1.38E11

  3. ATLAS • Fill 214 • At VAX SR: DP 1.5E-9 • In the right side of IP: VGI.188.1R1.X when in collision a pressure bump up to 1E-10 is recorded • At 18 m : 5.8 10-11 mbar / 9.8 10-11 mbar • At 22 m : 2 10-9mbar / 2 10-9 mbar

  4. ATLAS Extended • Some electron cloud is visible during the fill at 120 m from IP. • Q3L1/Q3R1 has electron cloud • At 58 m : 2.2 10-9 mbar / 1.9 10-9 mbar • At 120 m : 1.4 10-9 mbar / 1.3 10-9 mbar

  5. ATLAS history • Some signals with spikes at VAX during fills 2105, 2110,2117 2105 2110 2117 2124 2101

  6. CMS • Fill 214 • At VAX SR: DP 1.5E-9 • In all IP : pressure signal increases after collision to 5-8 10-10mbar • In the right side of IP, 18 m: VGI.183.1R1.X has pressure up to 1 10-8 mbar • At 14 m : 1.1 10-11 mbar / 1.1 10-11mbar • At 18 m : 6.4 10-10 mbar / 7.2 10-9 mbar • At 22 m : 2.3 10-10mbar / 2.8 10-10 mbar

  7. CMS Extended • Some electron cloud is visible during the fill at 120 m from IP. • Q3L5 shows signs of electron cloud • At 59 m : 7.5 10-10 mbar / 7.9 10-11 mbar • At 120 m : 1.7 10-9 mbar / 1.7 10-9 mbar

  8. CMS history 2105 2110 2117 2124 2101

  9. LHCb • Fill 214 • At VAX SR: DP 1.8E-10 • Electron cloud at VELO • At VELO : 5.5 10-9mbar • At 19 m, right of IP : 1.1 10-10mbar • At 22 m : 2.5 10-10mbar / 2.8 10-10mbar

  10. LHCbExtented • Pressure between Q3R8 and D2R8 is dominated by TDI8R • No pressure spikes at D1L8 but some at D1R8 • At 70 m : 7.3 10-9 mbar / 5.4 10-9 mbar • At 100 m : 3.3 10-10 mbar / 4.2 10-9 mbar

  11. LHCbhistory 2105 2124 2117 2110 2101

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