Electron cloud in the CERN accelerators (PS, SPS, LHC)

  title={Electron cloud in the CERN accelerators (PS, SPS, LHC)},
  author={Giovanni Iadarola and Giovanni Rumolo},
  journal={arXiv: Accelerator Physics},
Several indicators have pointed to the presence of an Electron Cloud (EC) in some of the CERN accelerators, when operating with closely spaced bunched beams. In particular, spurious signals on the pick ups used for beam detection, pressure rise and beam instabilities were observed at the Proton Synchrotron (PS) during the last stage of preparation of the beams for the Large Hadron Collider (LHC), as well as at the Super Proton Synchrotron (SPS). Since the LHC has started operation in 2009… 

Figures and Tables from this paper

Electron cloud formation in CERN particle accelerators and its impact on the beam dynamics

In high energy accelerators operating with positively charged particles, photoemission and secondary emission can give rise to an exponential electron multiplication within the beam chamber, which

JACoW : Beam Dynamics Challenges for the LHC and Injector Upgrades

The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) will rely on significantly higher bunch current and brightness to meet the future yearly integrated luminosity target. The

Mitigation of coherent beam instabilities (MCBI) for CERN LIU and HL-LHC

This paper focuses on proton beams by describing the identified performance limitations of the LHC and its injectors, as well as the actions envisioned to overcome them.

APS : First accelerator test of vacuum components with laser-engineered surfaces for electron-cloud mitigation

Electron cloud mitigation is an essential requirement for high-intensity proton circular accelerators. Among other solutions, laser engineered surface structures (LESS) present the advantages of

Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

Particle accelerators with superconducting magnets operating at cryogenic temperatures use a beam screen (BS) liner that extracts heat generated by the circulating bunched charge particle beam before

Energy-resolved secondary-electron emission of candidate beam screen materials for electron cloud mitigation at the Large Hadron Collider

Energy-resolved secondary electron spectroscopy has been performed on air-exposed standard Cu samples and modified Cu surfaces that are tested and possibly applied to efficiently suppress electron

Beam Instabilities in Hadron Synchrotrons

Beam instabilities cover a wide range of effects in particle accelerators and they have been the subjects of intense research for several decades. As the machines performance was pushed new

Challenges in Beam Instrumentation and Diagnostics for Large Ring Colliders -Based on the LHC Experience

An overview on some of the major challenges for beam instrumentation and diagnostics for large ring colliders is given. In the Introduction the general challenges are listed, independent of particle

Implementation of Carbon Thin Film Coatings in the Super Proton Synchrotron (SPS) for Electron Cloud Mitigation

Low Secondary Electron Yield (SEY) carbon thin films eradicate electron multipacting in accelerator beam pipes. Two magnetic cells of the SPS were coated with such material and installed. In total




The RF systems which are necessary for the generation of the nominal proton beam for the LHC in the PS Complex have been installed in the PSB and in the PS during the shutdown 97-98. This has

Et al

A large population-based survey of veterans and nondeployed controls found evidence of a deployment-related Gulf War syndrome by factor analysis in Air Force veterans and controls.


  • Rev. Letters 100
  • 2008

in Proceedings of Chamonix X & XI

  • CERN-SL-2000-001 DI (2000) and. CERN-SL-2001-003 DI
  • 2001

and F

  • Zimmermann, in Proceedings of PAC 2001
  • 2001

Improved electron cloud build up modeling with PyECLOUD


    • Rev. Lett. 85
    • 2000


    • Rev. Lett. 97
    • 2006


    • Rev. ST Accel. Beams 11, 094401
    • 2008

    and F

    • Zimmermann , in Proceedings of PAC2005
    • 2005