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201599 https://hdl.handle.net/2286/R.2.N.201599 http://rightsstatements.org/vocab/InC/1.0/ All Rights Reserved 2025 164 pages Masters Thesis Academic theses en Dupre, Alan Holl, Mark Waas, Tony Graves, William Rykaczewski, Konrad Arizona State University Partial requirement for: M.S., Arizona State University, 2025 Field of study: Mechanical Engineering The Compact X-Ray Free Electron Laser (CXFEL) is a novel X-Ray source that enables the study of processes at the fundamental scales of matter by generating fully coherent pulses of short X-Rays using inverse Compton scattering of relativistic electrons with high-intensity laser pulses. The CXFEL uses a system of high-power radio frequency (RF) transmitters, junctions, splitters, active RF components, and waveguides to deliver microwave RF power to electron photoinjector, linear accelerator, and emittance exchange cavities. The temperature of each component in this system must be regulated so that the component geometry does not change during operation and disrupt microwave energy arrival time in the beamline. In this work, the design of two Precision Thermal Trim Units (PTTUs) is presented. Each PTTU provides temperature-regulated water to a system of high-power RF components. The requirements for each PTTU and a description of the relevant components served by the PTTU are described. The power propagating through the waveguide system is analyzed, and a model for calculating the heat load to each component is developed. Using a simplified lumped-parameter model, the water temperature rise in each component is predicted for a given flow rate. Using ANSYS Fluent, simulations of the heating and cooling of RF components are developed to provide more accurate predictions and to determine the valid range of prediction of the lumped-parameter model. Using the results of these simulations, components of the waveguide system are iteratively combined into daisy-chains, and an operating flow rate for each cooling circuit is determined such that the water temperature does not rise by more than 1 °C. Based on these flow rates, pressure-independent valves, which regulate to a setpoint flow rate, are selected for each circuit. Using theoretical and numerical calculations of expected pressure drops in the system, the diameter of water hoses that deliver water to and from each component or daisy-chain are selected. Based on a holistic analysis of flow rates and pressure drops, the quantity and operating point of pumps for each PTTU are determined. Finally, the full design of each PTTU is summarized. Mechanical Engineering Physics Analysis and Design of CXFEL Precision Water Cooling Parameters for High-Power RF System Components