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TY - UNPB AU - Jensen, E. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - RF Basics and TM Cavities J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - Starting from basic principles, the lecture introduces waveguides and cavities, along with the quantities used to describe their performance. Narrowing down to a class of cavities with purely transverse magnetic fields (TM), which in the form of "elliptical cavities" are most frequently used for superconducting RF, guidelines are given how to optimize these cavities for different uses. Finally, some ancillaries (HOM dampers, couplers, tuners) are briefly mentioned. PB - JACoW Publishing CP - Geneva, Switzerland ER -