Integrated design of high performance pulsed power converters : application to klystron modulators for the compact linear colider (CLIC)

Authors: Cabaleiro Magallanes, Francisco
Advisor: Viarouge, PhilippeAguglia, Davide
Abstract: This research work presents the study, design and validation of a pulsed power converter topology that performs accurate voltage droop compensation for high performance klystron modulators. This topology is capable of compensating the voltage droop of the intermediate capacitor bank and, at the same time, it makes possible a constant power consumption operation of the modulator from the utility grid. These two main specifications are required for the Compact Linear Collider (CLIC) Drive Beam klystron modulators. The dimensioning of the system is performed by developing a global optimization design tool. This tool is first based on developed analytical models describing the performances of each system subcomponent. All these models are integrated into an intermediate design environment that uses nonlinear optimization techniques to calculate an optimal dimensioning of the system. The intermediate optimal solution performances are then evaluated using a more accurate model based on numerical simulation. Therefore, an optimization technique using «space mapping» is implemented. If differences between predicted performances and simulated results are non-negligible, correction factors are applied to the analytical models and the optimization process is launched again. This method makes possible to achieve an optimal solution validated by numerical simulation while reducing the number of numerical simulation steps. The selected final topology for the CLIC klystron modulator is experimentally validated using reduced scale prototypes. Results validate the selected methodology and fulfill the specifications.
Document Type: Thèse de doctorat
Issue Date: 2018
Open Access Date: 26 April 2019
Grantor: Université Laval
Collection:Thèses et mémoires

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