IPAC2014 - List of Authors (Vollinger, C.)

Paper	Title	Page
THPRI053	Ferrite Material Characterization in a Static Bias Field for the Design of a Tunable Cavity	3890
SUSPSNE088	use link to see paper's listing under its alternate paper code
	J. Eberhardt, F. Caspers, C. Vollinger CERN, Geneva, Switzerland
	During the development of ferrite-loaded accelerating cavities, the electromagnetic properties of the dispersive ferrite material need to be known. We describe a coaxial short-circuit measurement technique to measure the complex permeability of toroidal-shaped samples (127mm outer and 70mm inner diameter) that are exposed to an external magnetic bias field. The external magnetic bias field is applied perpendicular to the RF magnetic field. With this method it is possible to characterize the frequency dependence of the permeability for a frequency range of 1-100MHz. The dependence of the permeability on the external magnetic bias is presented for the ferrite G-510 from Trans-Tech Inc. and the material characterization is shown in the same frequency range. The measurement results are verified by simulations of the measurement set-up.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI053
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THPRI054	Permittivity and Permeability Measurement Methods for Particle Accelerator Related Materials	3893
	C. Vollinger, F. Caspers, E. Jensen CERN, Geneva, Switzerland
	For the special requirements related to particle accelerators, knowledge of the different material parameters of dielectrics and other materials are needed in order to carry out simulations during the design process of accelerator components. This includes also properties of magnetically biased ferrites of which usually little information is available about material characteristics, especially in magnetic bias fields. Several methods of measurement are discussed and compared of which some require delicate sample preparation whereas others can work with unmodified material shapes that makes those methods also suited for acceptance checks on incoming materials delivered by industry. Applications include characterization of different materials, as absorbers in which dielectric losses play an increasing role, as well as low frequency measurements on ferrites that are used for tunable cavities. We present results obtained from both broadband and resonant measurements on different materials determined in the same sample holder. Where possible, the results were confirmed with alternative methods.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI054
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

THPRI053

Ferrite Material Characterization in a Static Bias Field for the Design of a Tunable Cavity

3890

SUSPSNE088

use link to see paper's listing under its alternate paper code

J. Eberhardt, F. Caspers, C. Vollinger
CERN, Geneva, Switzerland

During the development of ferrite-loaded accelerating cavities, the electromagnetic properties of the dispersive ferrite material need to be known. We describe a coaxial short-circuit measurement technique to measure the complex permeability of toroidal-shaped samples (127mm outer and 70mm inner diameter) that are exposed to an external magnetic bias field. The external magnetic bias field is applied perpendicular to the RF magnetic field. With this method it is possible to characterize the frequency dependence of the permeability for a frequency range of 1-100MHz. The dependence of the permeability on the external magnetic bias is presented for the ferrite G-510 from Trans-Tech Inc. and the material characterization is shown in the same frequency range. The measurement results are verified by simulations of the measurement set-up.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI053

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPRI054

Permittivity and Permeability Measurement Methods for Particle Accelerator Related Materials

3893

C. Vollinger, F. Caspers, E. Jensen
CERN, Geneva, Switzerland

For the special requirements related to particle accelerators, knowledge of the different material parameters of dielectrics and other materials are needed in order to carry out simulations during the design process of accelerator components. This includes also properties of magnetically biased ferrites of which usually little information is available about material characteristics, especially in magnetic bias fields. Several methods of measurement are discussed and compared of which some require delicate sample preparation whereas others can work with unmodified material shapes that makes those methods also suited for acceptance checks on incoming materials delivered by industry. Applications include characterization of different materials, as absorbers in which dielectric losses play an increasing role, as well as low frequency measurements on ferrites that are used for tunable cavities. We present results obtained from both broadband and resonant measurements on different materials determined in the same sample holder. Where possible, the results were confirmed with alternative methods.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2014-THPRI054

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)