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Wanzenberg, R.

Paper Title Page
MPPP022 The Impedance of Selected Components of the Synchrotron Light Source Petra III 1751
 
  • R. Wanzenberg, K. Balewski
    DESY, Hamburg
  
  At DESY it is planned to convert the PETRA ring into a synchrotron radiation facility, called PETRA III, in 2007. Since the impedance of the machine determines its performance with respect to coupled and single bunch instabilities it is important to know the wakefields and higher order modes (HOMs) of the different components of the vacuum system. Numerical calculations of wakefields and HOMs are presented for several components of PETRA III, including the rf-cavities, shielded bellows and tapered vacuum chamber transitions. The impedance of these components is presented in terms of the loss and kick parameters.  
RPPP045 Single-Bunch Instability Driven by the Electron Cloud Effect in the Positron Damping Ring of the International Linear Collider 2884
 
  • M.T.F. Pivi, T.O. Raubenheimer
    SLAC, Menlo Park, California
  • A.F. Ghalam
    USC, Los Angeles, California
  • K.C. Harkay
    ANL, Argonne, Illinois
  • K. Ohmi
    KEK, Ibaraki
  • R. Wanzenberg
    DESY, Hamburg
  • A. Wolski
    LBNL, Berkeley, California
  • F. Zimmermann
    CERN, Geneva
  
  Funding: Work supported by the U.S. DOE under contracts DE-AC02-76SF00515.

With the recommendation that the future International Linear Collider (ILC) should be based on superconducting technology, there is considerable interest in exploring alternate designs for the damping rings (DR). The TESLA design was 17 km in circumference with a "dog-bone" configuration. Two other smaller designs have been proposed that are 6 km and 3 km in length. In the smaller rings, collective effects may impose the main limitations. In particular for the positron damping ring, an electron cloud may be produced by ionization of residual gas or photoelectrons and increase through the secondary emission process. The build-up and development of an electron cloud is more severe with the higher average beam current in the shorter designs. In this paper, we present recent computer simulation results for the electron cloud build-up and instability thresholds for the various DR configurations.