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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
  • 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?
  • 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 – How 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?

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

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
  • 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
  • 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
  • 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

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 – G-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 Results – 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 – G-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 – Verification 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

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

slide16

Thank you for your attention!

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

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