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Lutman, A. A.G.

Paper Title Page
WEPPH019 Determination of the Wakefield Budget for the FERMI FEL Undulator System 374
 
  • C. Bontoiu, P. Craievich, L. Rumiz
    ELETTRA, Basovizza, Trieste
  • M. Castronovo
    Università degli Studi di Trieste, Trieste
  • R. Vescovo, A. A.G. Lutman
    DEEI, Trieste
  
  The FERMI project aims to achieve very high-brightness photon beam pulses of minimum bandwidth. These goals can be marred by the presence of large wakefields generated along the length of the undulator small-gap vacuum chamber. Estimations of the induced energy-spread caused by the resistive wall and surface roughness wakefields along the length of the vacuum chamber of the FERMI FEL undulator are presented. The energy spread and losses induced by the resistive wall wakefield are determined for three possible transverse geometries of the vacuum chamber, namely circular, rectangular and elliptical cross-section, while the energy spread and losses induced by the surface roughness wakefields are obtained for the circular cross-section case. In this last case in-house surface profile measurements are used to provide realistic estimates.