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

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

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  1. 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

  2. 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

  3. 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

  4. 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

  5. Motivation – Why Ferrite Loaded? Tuning 18 – 40 MHz → ferrite ring 29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 5

  6. State of the Art – Examples 29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 6

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. 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

  13. 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

  14. 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

  15. 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

  16. Thank you for your attention! 29. Oktober 2013 | TU Darmstadt | Fachbereich 18 | Institut Theorie Elektromagnetischer Felder | Johannes Eberhardt | 16

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