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000642124 0247_ $$2datacite_doi$$a10.3204/PUBDB-2025-05356
000642124 037__ $$aPUBDB-2025-05356
000642124 041__ $$aEnglish
000642124 1001_ $$0P:(DE-H253)PIP1108271$$aAdemoye, Jennifer$$b0$$eCorresponding author$$gfemale$$udesy
000642124 245__ $$aMagnetometric Studies on Flux Trapping Sensitivity of Superconducting Radiofrequency Cavities$$f2025-01-15 - 2025-06-18
000642124 260__ $$aHamburg$$c2025
000642124 300__ $$a58
000642124 3367_ $$2DRIVER$$abachelorThesis
000642124 3367_ $$02$$2EndNote$$aThesis
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000642124 3367_ $$0PUB:(DE-HGF)2$$2PUB:(DE-HGF)$$aBachelor Thesis$$bbachelor$$mbachelor$$s1767863788_1893145
000642124 3367_ $$2BibTeX$$aMASTERSTHESIS
000642124 3367_ $$2ORCID$$aSUPERVISED_STUDENT_PUBLICATION
000642124 502__ $$aBachelorarbeit, University of Hamburg, 2025$$bBachelorarbeit$$cUniversity of Hamburg$$d2025
000642124 520__ $$aThe increasing demand for high-performance superconducting radiofrequency (SRF) cavities in particle accelerators,especially in free electron lasers, has led to intensified research on optimizing cavity treatments. One promisingrecent development is the application of medium temperature heat treatments, which are typically performed at250 ◦C - 350 ◦C in a vacuum furnace for several hours. It has been shown that these mid-T heat treatmentsenhance cavity performance by increased quality factors. However, the improved performance comes with thetrade-off of an increased sensitivity to trapped magnetic flux of the cavity, which leads to lower quality factors. Forthe first time at DESY, the sensitivity to magnetic flux trapping is deduced from parasitic cavity measurements.The data retrieval and analysis in the scope of this project was only accessible due to a new systematic approachto both experimental test conditions and data acquisition systems. The sensitivity to trapped magnetic flux issystematically investigated on four cavities with very different heat treatments. Magnetic field measurements wereconducted using three magnetic sensors mounted on the cavity equator. Additionally, the temperature gradientsduring the cooldown procedures are analyzed and showed consistencies in regard to the according cavity qualityfactors. Finally, results are compared to data of previous studies. These findings display the complex interplaybetween chemical and heat treatments, material properties and thermal dynamics on SRF niobium cavities. It canbe confirmed that mid-T heat treated cavities show significantly increased sensitivity values 3-5 times higher thanfor cavities without this heat treatment. Moreover, differences in sensor signals after applying an external magneticfield highlight the influence of cavity characteristics, such as grain structure and defects. These findings provide astrong foundation for future optimization of cavity treatments for a second generation of EuXFEL cavities, whichare required for the planned upgrade of the European XFEL accelerator.
000642124 536__ $$0G:(DE-HGF)POF4-621$$a621 - Accelerator Research and Development (POF4-621)$$cPOF4-621$$fPOF IV$$x0
000642124 693__ $$0EXP:(DE-H253)SRF-RD-20221201$$5EXP:(DE-H253)SRF-RD-20221201$$eSuperconductivity Radio Frequency Research and Development$$x0
000642124 7001_ $$0P:(DE-H253)PIP1006596$$aSteder, Lea$$b1$$eThesis advisor
000642124 7001_ $$0P:(DE-H253)PIP1032393$$aHillert, Wolfgang$$b2$$eThesis advisor
000642124 8564_ $$uhttps://bib-pubdb1.desy.de/record/642124/files/Bachelorarbeit_Jennifer%20Ademoye_36%20MB.pdf$$yOpenAccess
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000642124 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1108271$$aDeutsches Elektronen-Synchrotron$$b0$$kDESY
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000642124 9101_ $$0I:(DE-588b)2008985-5$$6P:(DE-H253)PIP1006596$$aDeutsches Elektronen-Synchrotron$$b1$$kDESY
000642124 9101_ $$0I:(DE-H253)_CFEL-20120731$$6P:(DE-H253)PIP1032393$$aCentre for Free-Electron Laser Science$$b2$$kCFEL
000642124 9101_ $$0I:(DE-HGF)0$$6P:(DE-H253)PIP1032393$$aExternal Institute$$b2$$kExtern
000642124 9131_ $$0G:(DE-HGF)POF4-621$$1G:(DE-HGF)POF4-620$$2G:(DE-HGF)POF4-600$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Materie$$lMaterie und Technologie$$vAccelerator Research and Development$$x0
000642124 9141_ $$y2025
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000642124 920__ $$lyes
000642124 9201_ $$0I:(DE-H253)MSL-20170609$$kMSL$$lSupraleitende Beschleuniger Technologie$$x0
000642124 980__ $$abachelor
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