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TY - UNPB AU - Petersen, B. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Fundamentals of Cryomodule Design and Cryogenics 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 - Some considerations and specifications for cryomodule design are discussed for different accelerator applications. The cryomodule design as well as the layout of the cryogenic distribution scheme have to be adapted to the particular accelerator requirements. Disregarding the differences, the various cryomodule designs share several common fundamental features like thermal insulation and RF cavity alignment. Examples for cryomodule designs are shown with reference to the ESS and XFEL cryomodules. Some criteria for the choice of the superconducting cavity operation temperature are discussed. Fundamental elements of helium refrigerators are shown. In particular, different options for subatmospheric Helium II bath cooling are illustrated. The importance of Helium bath pressure stability for the RF operation of superconducting cavities is clarified. Some methods to adapt the refrigerator operation to RF load changes or to compensate the RF load changes are explained. The XFEL linac cryogenic system layout is presented as an example. PB - JACoW Publishing CP - Geneva, Switzerland ER -