WEXFI  —  Beam Dynamics and Electromagnetic Fields   (28-Jun-06   09:00—10:30)

Chair: R.W. Garnett, LANL, Los Alamos, New Mexico

   
Paper Title Page
WEXFI01 Instabilities and Space Charge Effects in High Intensity Ring Accelerators 1882
 
  • O. Boine-Frankenheim, I. Hofmann, V. Kornilov
    GSI, Darmstadt
 
  This presentation will review beam dynamics in circular accelerators with high beam intensity and space charge effects. The main focus will be on recent theoretical and experimental results related to collective instabilities and resonance crossing with space charge. In the first part of the presentation, the effect of space charge on collective instability thresholds and impedance budgets will be discussed. In this context the effect of space charge induced mode coupling on the longitudinal microwave instability will be illustrated. The stability of longitudinal bunched beam modes and of transverse dipole modes in the presence of space charge will be discussed. Recent work related to the transverse mode coupling instability (TMCI) with space charge will be reviewed. In the second part of the presentation, "incoherent" space charge effects on transverse nonlinear dynamics issues, like nonlinear resonance crossing, will be reviewed.  
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WEXFI02 Observation and Modeling of Electron Cloud Instability 1887
 
  • K.C. Harkay
    ANL, Argonne, Illinois
 
  This presentation will review experimental results and the state of the art in the analysis and simulation of the electron cloud instability in hadron and positron storage rings.  
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WEXFI03 Non-linear Collimation in Linear and Circular Colliders 1892
 
  • A. Faus-Golfe
    IFIC, Valencia
  • J. Resta-López, F. Zimmermann
    CERN, Geneva
 
  We describe the concept on nonlinear collimation of beam halo in linear and circular colliders. In particular we present the application of such a concept in two different cases: the energy collimation system for CLIC at 3 TeV c.m. energy and a betatron collimation system for LHC at 14 TeV c.m. energy. For each case, the system properties, like chromatic bandwidth, collimator survival and cleaning efficiency, are evaluated and compared with those of the corresponding linear collimation system.  
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