Author: Betz, M.
Paper Title Page
THPFI052 Application of Atmospheric Plasma-sprayed Ferrite Layers for Particle Accelerators 3406
  • F. Caspers, M. Betz, S. Federmann, M. Taborelli
    CERN, Geneva, Switzerland
  • K. K., C.A.M. Schulz
    Surface Engineering Institute, RWTH Aachen University, Aachen, Germany
  • J.X. Wu
    IMP, Lanzhou, People's Republic of China
  A common problem in all kind of cavity like structures in particle accelerators is the occurrence of RF-resonances. Typically, ferrite plates attached to the walls of such structures like diagnostic devices, kickers or collimators, are used to dampen those undesired modes. However the heat transfer rate from these plates to the walls is rather limited. Brazing ferrite plates to the walls is not possible in most cases due to the different thermal expansion coefficients. To overcome those limitations, atmospheric plasma spraying techniques have been investigated. Ferrite layers with a thickness from 50 micron to about 300 micron can be deposited on metallic surfaces like stainless steel exhibiting good thermal contact and still reasonable absorption properties. In this paper the technological aspects of plasma deposition are discussed and results of specifically developed RF loss measurement procedures for such thin magnetically lossy layers on metal are presented. This kind of layers can also be applied for the production of high temperature RF power loads and related examples will be shown.