D'Angelo, Laura Anna Maria (2023)
Quasi-3D Quench Simulation for Superconducting Accelerator Magnets.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00023131
Dissertation, Erstveröffentlichung, Verlagsversion
Kurzbeschreibung (Abstract)
Numerical field simulations play a crucial role in understanding and predicting quench phenomena in superconducting accelerator magnets. However, they impose a geometrical as well as physical multi-scale problem. The model of accelerator magnets, which are several meters long, has to resolve geometrical details in the order of micro- to millimeters. A quench propagates over several geometrical orders of magnitude in a very short time, massively affecting the properties of the superconducting material in the process. A full three-dimensional finite element simulation with sufficient accuracy of the nonlinear magneto-thermal quench behavior is far beyond reach.
This dissertation presents an alternative approach to the calculation and analysis of three-dimensional effects arising in quench scenarios. To this end, a two-dimensional finite element method on the transversal magnetic cross-section is combined with a one-dimensional spectral element method based on orthogonal polynomials in the longitudinal direction. The result is a quasi-three-dimensional method with hybrid shape functions. This method is formulated, implemented in an object-oriented program structure, and verified by convergence studies and reference simulations. For the application of the method to quench simulations, this quasi-three-dimensional framework is extended by dedicated quench state and end winding models as well as field-network coupling, relevant boundary conditions, and efficient nonlinear iteration procedures. Finally, this quasi-three-dimensional simulation approach is applied to the nonlinear magneto-thermal strongly coupled quench simulation of superconducting cables and coils. Comparisons with conventional three-dimensional finite element solvers show that the presented numerical method yields more accurate results while requiring much less computational effort. Thus, the developed quasi-three-dimensional simulation method is a valuable tool to analyze quenching scenarios in superconducting accelerator magnets.
Typ des Eintrags: | Dissertation | ||||
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Erschienen: | 2023 | ||||
Autor(en): | D'Angelo, Laura Anna Maria | ||||
Art des Eintrags: | Erstveröffentlichung | ||||
Titel: | Quasi-3D Quench Simulation for Superconducting Accelerator Magnets | ||||
Sprache: | Englisch | ||||
Referenten: | De Gersem, Prof. Dr. Herbert ; Späck-Leigsnering, Dr.-Ing. Yvonne ; Russenschuck, Dr.-Ing. Stephan | ||||
Publikationsjahr: | 2023 | ||||
Ort: | Darmstadt | ||||
Kollation: | xiv, 102 Seiten | ||||
Datum der mündlichen Prüfung: | 28 März 2023 | ||||
DOI: | 10.26083/tuprints-00023131 | ||||
URL / URN: | https://tuprints.ulb.tu-darmstadt.de/23131 | ||||
Kurzbeschreibung (Abstract): | Numerical field simulations play a crucial role in understanding and predicting quench phenomena in superconducting accelerator magnets. However, they impose a geometrical as well as physical multi-scale problem. The model of accelerator magnets, which are several meters long, has to resolve geometrical details in the order of micro- to millimeters. A quench propagates over several geometrical orders of magnitude in a very short time, massively affecting the properties of the superconducting material in the process. A full three-dimensional finite element simulation with sufficient accuracy of the nonlinear magneto-thermal quench behavior is far beyond reach. This dissertation presents an alternative approach to the calculation and analysis of three-dimensional effects arising in quench scenarios. To this end, a two-dimensional finite element method on the transversal magnetic cross-section is combined with a one-dimensional spectral element method based on orthogonal polynomials in the longitudinal direction. The result is a quasi-three-dimensional method with hybrid shape functions. This method is formulated, implemented in an object-oriented program structure, and verified by convergence studies and reference simulations. For the application of the method to quench simulations, this quasi-three-dimensional framework is extended by dedicated quench state and end winding models as well as field-network coupling, relevant boundary conditions, and efficient nonlinear iteration procedures. Finally, this quasi-three-dimensional simulation approach is applied to the nonlinear magneto-thermal strongly coupled quench simulation of superconducting cables and coils. Comparisons with conventional three-dimensional finite element solvers show that the presented numerical method yields more accurate results while requiring much less computational effort. Thus, the developed quasi-three-dimensional simulation method is a valuable tool to analyze quenching scenarios in superconducting accelerator magnets. |
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Alternatives oder übersetztes Abstract: |
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Freie Schlagworte: | Feldsimulation, Quench, Finite Elemente, Spektrale Elemente, Quasi-3D | ||||
Status: | Verlagsversion | ||||
URN: | urn:nbn:de:tuda-tuprints-231311 | ||||
Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau | ||||
Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Teilchenbeschleunigung und Theorie Elektromagnetische Felder > Theorie Elektromagnetischer Felder 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Teilchenbeschleunigung und Theorie Elektromagnetische Felder |
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Hinterlegungsdatum: | 24 Apr 2023 12:01 | ||||
Letzte Änderung: | 03 Mai 2023 09:44 | ||||
PPN: | |||||
Referenten: | De Gersem, Prof. Dr. Herbert ; Späck-Leigsnering, Dr.-Ing. Yvonne ; Russenschuck, Dr.-Ing. Stephan | ||||
Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 28 März 2023 | ||||
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