Investigation of tuning schemes of high q ferrite loaded cavities
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Investigation of Tuning Schemes of High-Q Ferrite-Loaded Cavities. Johannes Eberhardt CERN, Beams Department / TU Darmstadt, TEMF Institute. Presentation of PhD Project 01.03.2013 – 29.02.2016 CERN Supervisor: Dr.-Ing. Christine V öllinger TEMF Supervisor: Prof. Dr.-Ing. Harald Klingbeil.

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Investigation of tuning schemes of high q ferrite loaded cavities

Investigation of Tuning Schemes of High-Q Ferrite-Loaded Cavities

Johannes Eberhardt

CERN, Beams Department / TU Darmstadt, TEMF Institute

Presentation of PhD Project

01.03.2013 – 29.02.2016

CERN Supervisor: Dr.-Ing. Christine Völlinger

TEMF Supervisor: Prof. Dr.-Ing. Harald Klingbeil

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 1


Tuning schemes of ferrite cavities
Tuning Schemes of Ferrite Cavities Cavities

  • Motivation

  • State of the art

  • Scope of the work

  • First results for G-510 material characteristics

  • Next steps and challenges

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 2


Motivation which application
Motivation – Which Application? Cavities

  • CERN injector complex update programme

  • PS2: novel accelerating cavity with 18 – 40 MHz tuning range required

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 3


Motivation how does an accelerating cavity work
Motivation – CavitiesHow does an Accelerating Cavity work?

accelerating gap

cylindrical structure

beam pipe

HRF

ERF

λ/4

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 4


Motivation why ferrite loaded
Motivation – Why Ferrite Loaded? Cavities

Tuning 18 – 40 MHz →

ferrite ring

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 5


State of the art examples
State of the Art – Examples Cavities

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 6


State of the art parallel biasing
State of the Art – Parallel Biasing Cavities

  • μr ~ slope of tangent line

  • increasing H1ll to H2ll shifts μr,1to μr,2

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 7


State of the art perpendicular biasing
State of the Art – Perpendicular Biasing Cavities

  • μr ~ slope of secant from origin to B-Hcurve.

  • Higher Magnetic Field strength needed

  • Operating point is closer to saturating magnetization 4πMs reduced RF losses and higher Q values.

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 8


State of the art 2 directional biasing
State of the Art – 2 Directional Biasing Cavities

  • First applying H1⊥→ operating point close to saturating magnetization

  • Rotating direction to H2ll→ modest increase in bias field

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 9


Scope of the work overview
Scope of the Work – Overview Cavities

Developing an accelerating cavity with 18 – 40 MHz tuning range using a simulation tool

  • Characterize dispersion of G-510

  • Verify results by simulation

  • Characterize bias field dependence of G-510

  • Verify results by simulation

  • Elaborate simulation model for perpendicular biasing to give an estimation of frequency range

  • Decision if perpendicular biasing is sufficient

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 10


First results g 510
First Results – CavitiesG-510

Coaxial short-circuit technique to determine

  • Measuring S11 for empty and filled sample holder

  • Analytical calculation of (S11) for sample holder

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 11


First results verification by simulation
First CavitiesResults – Verification by Simulation

Simulation of sample holder with (f) and (f) as input

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 12


First results g 5101
First Results – CavitiesG-510

Same method but for different bias field

= 13.0

= 2.0

≈ 6.5

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 13


First results verification by simulation1
First Results – CavitiesVerification by Simulation

Simulation of sample holder with (f) and (f) for = 200A

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 14


Scope of the work overview1
Scope of the Work – Overview Cavities

First Results:

  • Characterize dispersion of G-510

  • Verify results by simulation

  • Characterize bias field dependence of G-510

  • Verify results by simulation

    Next steps:

  • Elaborate simulation model for perpendicular biasing to give an estimation of frequency range

  • Decision if perpendicular biasing is sufficient

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 15


Investigation of tuning schemes of high q ferrite loaded cavities

Thank you for your attention! Cavities

29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 16