The Compact Linear Collider (CLIC) requires a low emittance beam transport and preservation, thus a precise control of the beam orbit along up to 50 km of the accelerator components in the sub-μm regime is required. Within the PACMAN 3 (Particle Accelerator Components Metrology and Alignment to the Nanometer Scale) PhD training action a study with the objective of pre-aligning the electrical centre of a 15 GHz cavity beam position monitor (BPM) to the magnetic centre of the main beam quadrupole is initiated. Of particular importance is the design of a specific test bench to study the stretched-wire setup for the CLIC Test Facility (CTF3) BPM, focusing on the aspects of microwave signal excitation, transmission and impedance-matching, as well as the mechanical setup and reproducibility of the measurement method.

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(UPV) for giving me the privileged opportunity to perform this work and PhD thesis. My special thanks go to the PACMAN leader, Dr. Hélène Mainaud-Durand, for her committement striving for the success of the project. My deep and eternal acknowledgements to my supervisor at CERN, Dr. Nuria Catalán Lasheras, for entrusting me with this responsibility, for her endless paciente and smart contributions in the development of this work; to my Ph.D. supervisors Dr. Ángeles Faus Golfe and Dr. Vicente Boria Esbert, for their dedication, involvement and bright professional and human guidance along these years. I would like to seize this opportunity to to thank the valuable help I obtained from Anastasiya Solodko and Serge Lebet with the conceptual design of the test bench, mechanical designs and manufacturing. I am also very grateful to César Blanch Gutiérrez and Dr. Juan Jose Garcia Garrigós for their kind technical assistance at IFIC. I highlight the collaboration from Guy Deferne and Olaf Dunkel in the manufacturing of the crucial wirepositioning systems. I highly appreciate the many times Pablo Sobrino Monpean, Dr. Matteo Volpi and Philippe Guyard carried the heavy test bench from the radiofrequency to the metrology laboratory. Thanks to the team involved in the imperative metrology measurements and analysis: Dr. Ahmed Cherif, Didier Glaude, Mathieu Duquenne, Dominique Pugnat and Cyril Haerinck. I emphasize the valuable innovative ideas and fruitful discussions with Dr.