Author: Gjonaj, E.
Paper Title Page
TUPWA008 Computation of Wakefields for an In-vacuum Undulator at PETRA III 1736
  • E. Gjonaj, L. Lünzer, T. Weiland
    TEMF, TU Darmstadt, Darmstadt, Germany
  • R. Wanzenberg
    DESY, Hamburg, Germany
  Funding: Work supported by DESY, Hamburg, Germany
At DESY the installation of an in-vacuum undulator at the synchrotron radiation facility PETRA III is under consideration. The moveable magnet array of the undulator is installed inside the vacuum chamber to achieve shorter wavelength synchrotron radiation. A thin metal foil covers the magnet structure to mitigate resistive wall wakefields. Moveable tapered transitions connect the magnet structure and the adjacent vacuum duct to reduce the geometric wakefields. Nevertheless these moveable tapered transitions contribute significantly to the impedance budget of PETRA III. The computer codes MAFIA, CST-Studio and PBCI have been used to calculate the longitudinal and transverse wakefields. The results for the loss and kick parameters are presented and compared to the corresponding parameters for a standard undulator section.