D'Angelo, Laura Anna Maria (2023)
Quasi-3D Quench Simulation for Superconducting Accelerator Magnets.
Technische Universität Darmstadt
doi: 10.26083/tuprints-00023131
Ph.D. Thesis, Primary publication, Publisher's Version
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Item Type: | Ph.D. Thesis | ||||
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Type of entry: | Primary publication | ||||
Title: | Quasi-3D Quench Simulation for Superconducting Accelerator Magnets | ||||
Language: | English | ||||
Referees: | De Gersem, Prof. Dr. Herbert ; Späck-Leigsnering, Dr.-Ing. Yvonne ; Russenschuck, Dr.-Ing. Stephan | ||||
Date: | 2023 | ||||
Place of Publication: | Darmstadt | ||||
Collation: | xiv, 102 Seiten | ||||
Date of oral examination: | 28 March 2023 | ||||
DOI: | 10.26083/tuprints-00023131 | ||||
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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Uncontrolled Keywords: | Feldsimulation, Quench, Finite Elemente, Spektrale Elemente, Quasi-3D | ||||
Status: | Publisher's Version | ||||
URN: | urn:nbn:de:tuda-tuprints-231311 | ||||
Classification DDC: | 600 Technology, medicine, applied sciences > 620 Engineering and machine engineering | ||||
Divisions: | 18 Department of Electrical Engineering and Information Technology > Institute for Accelerator Science and Electromagnetic Fields > Electromagnetic Field Theory (until 31.12.2018 Computational Electromagnetics Laboratory) | ||||
Date Deposited: | 24 Apr 2023 12:01 | ||||
Last Modified: | 26 Apr 2023 06:05 | ||||
URI: | https://tuprints.ulb.tu-darmstadt.de/id/eprint/23131 | ||||
PPN: | 507246640 | ||||
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