Evaluating Designs for a PETRA IV Cavity€¦ · Evaluating Designs for a PETRA IV Cavity W.F.O....
Transcript of Evaluating Designs for a PETRA IV Cavity€¦ · Evaluating Designs for a PETRA IV Cavity W.F.O....
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Evaluating Designs for a PETRA IV Cavity
W.F.O. Müller, W. Ackermann, H. De GersemInstitut für Theorie Elektromagnetischer Felder, Technische Universität Darmstadt
Cooperation MeetingNovember 15, 2018DESY, Hamburg
November 12, 2018 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang F.O. Müller | 1
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Outline
▪ Comparing two Cavity Types
▪ MAX IV Cavity:
▪ BESSY Cavity:
November 12, 2018 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang F.O. Müller | 2
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MAX IV Cavity (100 MHz)
▪ Fundamental Mode
November 12, 2018 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang F.O. Müller | 3
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MAX IV Cavity (100 MHz)
November 12, 2018 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang F.O. Müller | 4
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MAX IV Cavity (100 MHz)
November 12, 2018 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang F.O. Müller | 5
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MAX IV Cavity (tuned to 125 MHz)
November 12, 2018 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang F.O. Müller | 6
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MAX IV Cavity (tuned to 125 MHz)
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▪ Simpler Geometry without Capacitive Plate▪ Reduced Complexity for Cooling Channels▪ But Reduced Tuning Sensitivity by a Factor of 2.2▪ Still Good Separation of Higher Order Modes
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BESSY Cavity (500 MHz)
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▪ Design 2002-2007 byErnst Weihreter andFrank Marhauser
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BESSY Cavity (500 MHz)
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▪ Fundamental Mode
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BESSY Cavity (500 MHz)
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▪ Water Cooled Ferrite Load with Reflection below 20%
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Real Eigenvalues
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▪ Wave Guides Act as (1,2,3)-Quarter Wave Resonators
▪ Strong Coupling Leads to 4-fold Mode Splitting
▪ Complex EigenmodeAnalysis Needed
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BESSY Cavity (500 MHz)
November 12, 2018 | TU Darmstadt | Fachbereich 18 | Institut für Theorie Elektromagnetischer Felder | Wolfgang F.O. Müller | 12
▪ Dampers Replaced by Single Mode Wave Guide Port
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Complex Eigenvalues
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▪ Overview of First 371 Runs:
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Quality Factors
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▪ Quality Factor of HOMs below 200 up to 800 MHz
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Complex Eigenvalues
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▪ Slow Convergence For Low-Q Modes: