• M. Ivanyan, V.M. Tsakanov, A. Vardanyan
  CANDLE, Yerevan
• M.M. Dehler, T. Schmidt, A. Streun
  PSI, Villigen

The longitudinal and transverse impedances of CPMU (cryogenic permanent magnet undulators) of the SLS storage ring are evaluated. The study takes into account the walls frequency dependent conductivity and the electrical and magnetic properties of the material at low temperature.