• M. Korostelev, O.B. Malyshev, A. Wolski
  Cockcroft Institute, Warrington, Cheshire
• N.A. Collomb, J.M. Lucas, S. Postlethwaite
  STFC/DL, Daresbury, Warrington, Cheshire
• A.J.P. Thorley
  The University of Liverpool, Liverpool

The longitudinal wake fields have been calculated by using 3D code, CST Particle Studio, for a number of different vacuum chamber components of the 6.4 km ILC damping ring design. Based on the results, studies of bunch lengthening and single-bunch instabilities have been carried out. Bunch lengthening from a particle tracking code are compared with results from numerical solution of the Haissinski equation. The tracking code is used to predict the threshold for single-bunch instabilities.