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Measurement of the magnetic material properties for ferrite-loaded cavities

Klaus Klopfer1,*, Uwe Niedermayer1, Harald Klingbeil1,2, Wolfgang Ackermann1, Hans Günter König2, and Thomas Weiland1

  • 1Technische Universität Darmstadt, Institut für Theorie Elektromagnetischer Felder (TEMF), Schlossgartenstraße 8, 64289 Darmstadt, Germany
  • 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, 64291 Darmstadt, Germany

  • *klopfer@temf.tu-darmstadt.de
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Phys. Rev. ST Accel. Beams 18, 010101 – Published 30 January, 2015

DOI: https://doi.org/10.1103/PhysRevSTAB.18.010101

Abstract

Measurements of the magnetic characteristics of the Ferroxcube 8C12m ferrite material in the parameter range where the GSI heavy-ion synchrotron SIS 18 cavity resonator is operated are presented. At first, the permeability is determined as a function of frequency and bias magnetic field strength for low radio-frequency power levels. For this purpose, both reflection and transmission measurements are carried out in a test setup with two toroids. The values for the real and imaginary part obtained from the data analysis of both approaches are fully in agreement with each other, albeit the range of application of the latter setup is limited to moderate frequencies due to parasitic resonances. An empirical analytical expression is formulated which approximates the complex permeability reasonably well in the whole investigated bias and frequency range. Moreover, the B-H curve is recorded for a reduced bias current range of the cavity. The gained material characteristics are well suited for numerical eigenmode simulations for the GSI SIS 18 cavity.

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Phys. Rev. ST Accel. Beams 18, 010101– Published 30 January, 2015
  • Received 3 June 2014
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