Design and Characterization of a Prototype Stripline Beam Position Monitor for the Clic Drive Beam*

The prototype of a stripline Beam Position Monitor (BPM) with its associated readout electronics is under development at CERN, in collaboration with SLAC, LAPP and IFIC. The anticipated position resolution and accuracy are expected to be below 2μm and 20μm respectively for operation of the BPM in the CLIC drive beam (DB) linac. This paper describes the particular CLIC DB conditions with respect to the beam position monitoring, presents the measurement concept, and summarizes electromagnetic simulations and RF measurements performed on the prototype

Rôles,impacts et services issus des élevages en Europe. Synthèse du rapport d’expertise scientifique collective

L’élevage, secteur majeur pour l’économie de nombreux territoires et structurant beaucoup de paysages ruraux européens, fait l’objet de controverses, depuis au moins une décennie, notamment du fait des dommages environnementaux qu’il engendre. Dans un tel contexte, il est apparu nécessaire d’étayer les débats en faisant le point sur l’état des connaissances scientifiques relatives aux rôles, impacts et services environnementaux, économiques et sociaux issus des élevages européens et leurs produits. Pour ce faire, les ministères français en charge de l’Environnement et de l’Agriculture ainsi que l’Agence de l’environnement et de la maîtrise de l’énergie (Ademe) ont sollicité l’Inra pour réaliser une expertise scientifique collective (ESCo) abordant conjointement les multiples conséquences sur les milieux et le climat, l’emploi et le travail, les marchés et certains enjeux sociaux et culturels, de la production et de la consommation humaine de produits d’origine animale (bovins, ovins, caprins, porcins et avicoles). L’analyse de ces diverses dimensions s’appuie sur les démarches d’évaluation rapportées dans la littérature scientifique internationale. Abordées, dans un premier temps, de manière analytique et globale, les connaissances ont ensuite été mobilisées par « bouquet de services » au sein de territoires contrastés. Les relations entre les différents impacts ou services permettent d’identifier des compromis et des leviers d’action envisageables pour les systèmes d’élevage. Livestock production is a sector of major economic importance that defines many European rural areas. It has become the focus of controversy over the past decade or more, particularly with regard to the environmental impacts it causes. In this context, it seemed useful to support this debate with a critical review of the state of scientific knowledge on the role, impacts, and services – environmental, economic, and social – associated with European livestock production. Accordingly, the French ministries responsible for Agriculture and the Environment, in cooperation with the French Environment and Energy Management Agency (ADEME), requested INRA to undertake a collective scientific assessment addressing the many consequences – for the environment and the climate, for employment and labor, for markets, and for a variety of social and cultural issues – related to the production and human consumption of animal products (cattle, sheep, goats, pigs, and poultry). Analysis of these diverse dimensions was based on assessment methods utilized and described in the international scientific literature. Using a broad, analytical overview as a starting point, the review proceeded by identifying the "service bundles" associated with livestock production in contrasting areas

The Compact Linear Collider (CLIC) - 2018 Summary Report

The Compact Linear Collider (CLIC) is a TeV-scale high-luminosity linear $e^+e^-$ collider under development at CERN. Following the CLIC conceptual design published in 2012, this report provides an overview of the CLIC project, its current status, and future developments. It presents the CLIC physics potential and reports on design, technology, and implementation aspects of the accelerator and the detector. CLIC is foreseen to be built and operated in stages, at centre-of-mass energies of 380 GeV, 1.5 TeV and 3 TeV, respectively. CLIC uses a two-beam acceleration scheme, in which 12 GHz accelerating structures are powered via a high-current drive beam. For the first stage, an alternative with X-band klystron powering is also considered. CLIC accelerator optimisation, technical developments and system tests have resulted in an increased energy efficiency (power around 170 MW) for the 380 GeV stage, together with a reduced cost estimate at the level of 6 billion CHF. The detector concept has been refined using improved software tools. Significant progress has been made on detector technology developments for the tracking and calorimetry systems. A wide range of CLIC physics studies has been conducted, both through full detector simulations and parametric studies, together providing a broad overview of the CLIC physics potential. Each of the three energy stages adds cornerstones of the full CLIC physics programme, such as Higgs width and couplings, top-quark properties, Higgs self-coupling, direct searches, and many precision electroweak measurements. The interpretation of the combined results gives crucial and accurate insight into new physics, largely complementary to LHC and HL-LHC. The construction of the first CLIC energy stage could start by 2026. First beams would be available by 2035, marking the beginning of a broad CLIC physics programme spanning 25-30 years

Status of the Stripline Beam Position Monitor developement for the CLIC Drive Beam

In collaboration with SLAC, LAPP and IFIC, a first prototype of a stripline Beam Position Monitor (BPM) for the CLIC Drive Beam and its associated readout electronics has been successfully tested in the CLIC Test Facility linac (CTF3) at CERN. In addition, a modified prototype with downstream terminated striplines is under development to improve the suppression of unwanted RF signal interference. This paper presents the results of the beam tests, and the most relevant aspects for the modified stripline BPM design and its expected improvements

Characterization tests of a Stripline beam position monitor for the CLIC drive beam

A prototype of a stripline Beam Position Monitor (BPM) with its associated readout electronics has been developed at CERN in collaboration with SLAC, LAPP and IFIC. In this paper, the design and simulations of the BPM with the analog readout chain and the BPM test bench are described, and the results of the first characterization tests are presented. The position resolution and accuracy parameters are expected to be below 2μm and 20μm respectively for a beam with a bunching frequency of 12GHz, an average current of 101A and a machine repetition rate of 50H