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ABSTRACT: Long-term beam-electron cloud interaction is modeled with a three-dimensional parallel continuous model originally developed for plasma wakefield acceleration modeling. The simulation results are compared with the two-macroparticle model for strong head-tail instability. The two-macroparticle model captures some of the instability features of the beam; however, this model is too simple to accurately describe the complex nature of the beam-cloud interaction. The effects of dipole magnets on the horizontal and vertical beam size are discussed. The dipole magnets have stabilizing effect and reduce the beam spot size growth especially in the horizontal plane. The code is then used to model and make predictions for the beam dynamics in the presence of an electron cloud for several present and future circular machines around the world.
Physics of Plasmas 05/2006; 13(5):056710-056710-8. · 2.15 Impact Factor
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ABSTRACT: Long-term beam-electron cloud interaction is modeled with a 3D parallel continuous model originally developed for plasma wakefield acceleration modeling. The simulation results are compared with the two macro-particle model for strong head-tail instability. The two macro- particle model qualitatively captures some of the instability features of the beam. The code is then used to model and make predictions for the beam dynamics in the presence of an electron cloud for several present and future circular machines around the world.
Particle Accelerator Conference, 2005. PAC 2005. Proceedings of the; 06/2005
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Phys. Rev. ST Accel. Beams. 08/2003; 6(8):81002.
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ABSTRACT: The interaction between a low density electron cloud in a circular particle accelerator with a circulating charged particle beam is considered. The particle beam’s space charge attracts the cloud, enhancing the cloud density near the beam axis. Beam‐ cloud interaction is studied with a plasma wakefield accelerator simulation code and the results are benchmarked against an existing code. The restoring force on the off‐centered beam due to the cloud’s space charge is studied. The force is stronger at the tail than it is at the head due to the cloud compression near the tail of the beam. The beam dynamics over 20Km of the SPS ring at CERN is studied and the head‐tail dephasing is observed. © 2002 American Institute of Physics
AIP Conference Proceedings. 12/2002; 647(1):224-231.
