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[EN] The Compact Linear Collider (CLIC) is an electron-positron collider conceived for the study of High-Energy Physics in the TeV center of mass energy region, is based on a two-beam operation principle: instead of using active elements (klystrons), the necessary RF power to accelerate the Main Beam (MB) is obtained from the deceleration of a high-current, moderate energy Drive Beam (DB) in the so-called Power Extraction and Transfer Structures (PETS). These structures emit an RF signal of about 130 MW power at 12 GHz. As this frequency is above the cut-o ff frequency of the fundamental mode for the specified beam pipe dimensions (7.6 GHz), the inference propagates from the PETS to the neighboring devices, including the Beam Position Monitors (BPM). According to the CLIC Conceptual Design Report (CDR), an ef ficient beam position monitoring system for the CLIC DB decelerator needs to meet the following requirements: - It should be as simple and economic as possible, as 41580 units are required, amounting to 75% of all CLIC BPMs. - The signal processing scheme should not be a ffected by the PETS interference. This rules out processing the signals at the beam bunching frequency (12 GHz). - The resulting position signal should detect changes in the beam position whose duration is 10 ns or longer. - The required spatial resolution is 2 um for a 23 mm diameter vacuum pipe. - Wide dynamic range: the electronic acquisition system must be able to process signals with extreme levels, induced by either very high (100 A) or very low (3 A) current beams. This PhD thesis describes the electromagnetic and mechanical design of the first prototype BPM developed for the CLIC Drive Beam and its characterization tests in laboratory and with beam. The first two chapters introduce the CLIC project and review the state-of-the-art beam position monitoring techniques. Chapter 3 presents the design of the BPM. The stripline technology has been selected, as it is the only one among the most commonly used BPM techniques to present a suitable frequency response to filter out the RF interference caused by the PETS. Choosing an appropriate length for the electrodes, it is possible to tune one the periodic notches in the stripline frequency response to 12 GHz. The influence of di erent electromagnetic and geometrical aspects is also studied, such as beam coupling impedance or the ratio between longitudinal and transverse dimensions. The design of the electronic acquisition system is presented in Chapter 4, considering the project requirements in terms of resolution (2 u m), accuracy (20 um) and time resolution (10 ns). Due to the high amount of units required, the number of electronics components has been minimized. As the designed signal processing scheme is based on charge integration, it can be adapted to di erent stripline pick-ups by simply modifying the attenuator settings according to the required output signal levels. The laboratory characterization tests of the prototype stripline BPM, in the low and the high frequency ranges, performed with a thin wire and a coaxial waveguide, respectively, are described in Chapter 5. The measurement results are compared with the theoretical estimation and the electromagnetic field simulations. In addition, the high-frequency test reveals that the first prototype stripline BPM does not provide su cient suppression of the 12 GHz PETS RF interference. An additional study proposed several modifications and guidelines for a second prototype stripline BPM. Finally, Chapter 6 presents the beam tests of the prototype stripline BPM at the CLIC Test Facility 3 (CTF3) in the Test Beam Line (TBL), a scaled version of the CLIC Drive Beam decelerator. Two types of tests were performed: linearity/sensivity and resolution. These results are compared to the ones in the laboratory characterization tests. An upper bound of the resolution is estimated performing a Singular Value Decomposition (SVD) analysis. [ES] El Colisionador Lineal Compacto (Compact Linear Collider, CLIC), un colisionador de electrones y positrones concebido en el CERN para el estudio de la Fisica de Altas Energias en la region de los TeV, se basa en un principio de funcionamiento de doble haz: en lugar de emplear elementos activos (klystrons) para proporcionar la potencia RF requerida para acelerar el haz principal (Main Beam, MB), esta se obtiene de la deceleracion de un haz secundario (Drive Beam, DB), de alta corriente y energia moderada, en las llamadas estructuras de extraccion y transferencia de potencia (Power Extraction and Transfer Structures, PETS). Estas estructuras emiten una senal interferente RF de mas de 130 MW de potencia a 12 GHz, que, por estar localizada en una frecuencia superior a la de corte del modo fundamental en el tubo de vacio del haz (7.6 GHz), se propaga por este hacia los dispositivos adyacentes, entre los cuales se encuentran los sistemas de monitorizacion de la posicion (Beam Position Monitor, BPM). De acuerdo con el informe conceptual de diseno de CLIC (Conceptual Design Report, CDR) , un sistema eficiente de monitorizacion de la posicion del haz en el decelerador del haz secundario debera cumplir los siguientes requisitos: - Debe ser lo mas sencillo y economico posible, ya que se precisan 41580 unidades: el 75% de todos los BPMs de CLIC. - El procesado de senal en el sistema de adquisicion debera ser inmune a la interferencia generada en las PETS. Esto excluye la solucion habitual de procesar las senales del BPM a la frecuencia de pulsado del haz (12 GHz). - La senal de posicion resultante del procesado debe ser capaz de detectar cambios en la posicion del haz de duracion igual o mayor a 10 ns (resolucion temporal). - La resolucion espacial requerida es de 2 um para un tubo de vacio de 23 mm de diametro, con una calibracion precisa. - Amplio rango dinamico: el sistema electronico de adquisicion del BPM debe poder resistir los altos valores de senal provocados por los casos de desviacion extrema del haz nominal (se contempla una desviacion maxima de la mitad del radio del tubo), asi como detectar las senales inducidas por las configuraciones de haz con menor carga de todas las previstas, cuyos niveles seran muy debiles. [CAT] El Col·lisionador Lineal Compacte (Compact Linear Collider, CLIC), un col·lisionador d'electrons i positrons concebut per l'estudi de la Fisica d'Altes Energies a la regio dels TeV (energia del centre de massa), es basa en un principi de funcionament de doble feix:en lloc de fer servir elements actius (klystrons) per proporcionar la potencia RF requerida per accelerar el feix principal (Main Beam, MB), aquesta s'obte de la desacceleracio d'un feix secundari (Drive Beam, DB), d'alt corrent i energia moderada, a les anomenades estructures d'extraccio i transferencia de potencia (Power Extraction and Transfer Structures, PETS). Aquestes estructures emeten una senyal interferent RF de mes de 130 MW de potencia a 12 GHz, que, pel fet d'estar localitzada a una frequencia superior a la de tall del mode fonamental al tub de buit del feix (7.6 GHz), es propaga a traves d'aquest fins els dispositius adjacents, entre els quals trobem els sistemes de monitoritzacio de la posicio (Beam Position Monitor, BPM). D'acord amb l'informe conceptual de disseny de CLIC (Conceptual Design Report, CDR), un sistema eficient de monitoritzacio de la posicio del feix al desaccelerador del feix secundari haura de complir els seguents requisits: ? - Ha de ser el mes senzill i economic possible, ja que es necessiten 41580 unitats: el 75% de tots els BPMs de CLIC. ? - El processat de la senyal al sistema d'adquisicio haura de ser inmune a la interferencia generada als PETS. Aixo exclou la solucio habitual de processar les senyals del BPM a la frequencia de pulsacions del feix (12 GHz). ?- La senyal de posicio resultant del processat ha de ser capac de detectar canvis a la posicio del feix de durada igual o mes gran que 10 ns (resolucio temporal). ?- La resolucio espaial necessaria es de 2 um per a un tub de buit de 23 mm de diametre. ?- Ampli rang dinamic: el sistema electronic d'adquisicio del BPM ha de poder processar senyals amb nivells extrems, induides per feixos de molt alt (100 A) i molt baix (3 A) corrent.

BEAM POSITION MONITORING IN THE CLIC DRIVE BEAM DECELERATOR USING STRIPLINE TECHNOLOGY