Atom Interferometry in Space: Thermal Management and Magnetic Shielding

Atom interferometry is an exciting tool to probe fundamental physics. It is considered especially apt to test the universality of free fall by using two different sorts of atoms. The increasing sensitivity required for this kind of experiment sets severe requirements on its environments, instrument control, and systematic effects. This can partially be mitigated by going to space as was proposed, for example, in the Spacetime Explorer and Quantum Equivalence Principle Space Test (STE-QUEST) mission. However, the requirements on the instrument are still very challenging. For example, the specifications of the STE-QUEST mission imply that the Feshbach coils of the atom interferometer are allowed to change their radius only by about 260 nm or 2.6E-4% due to thermal expansion although they consume an average power of 22 W. Also Earth's magnetic field has to be suppressed by a factor of 10E5. We show in this article that with the right design such thermal and magnetic requirements can indeed be met and that these are not an impediment for the exciting physics possible with atom interferometers in space.Comment: v2: minor changes to agree with published version; 8 pages, 6 figure

Measuring On-Demand Audiovisual Services - The European Experience

editorial reviewedCette contribution analyse la problématique de la collecte de données et de l’analyse du marché des services audiovisuels à la demande en Europe, plus particulièrement dans l’Union européenne. Sont analysés le cadre réglementaire, les questions de déinition, le recensement des services, l’analyse des données relatives à la taille des marchés et à la consommation, la mesure des activités des services audiovisuels à la demande dans la promotion des oeuvres européennes (contribution au inancement, présence des oeuvres européennes dans les catalogues, mise en évidence des oeuvres européennes). La contribution se base largement sur les travaux de l’Observatoire européen de l’audiovisuel (Conseil de l’Europe – Strasbourg), mais tient compte également d’autres sources, publiques, professionnelles et privées.his contribution analyses the problems involved in data collection and market analysis of on-demand audiovisual services in Europe, and speciically within the European Union. It addresses the regulatory framework, deinition issues, the listing of services, the analysis of data related to market size and consumption, the measurement of on-demand audiovisual business in the promotion of European works (financial contribution, presence of European works in catalogs, showcasing of European works). he contribution is largely based on work carried out by the European Audiovisual Observatory (Council of Europe – Strasbourg), but also takes into account other public, professional and private sources

Activities of the European Audiovisual Observatory in the Field of Statistical Information

editorial reviewedEstablished in December 1992, the European Audiovisual Observatory is a unique pan-European public service organisation dedicated to gathering and distributing information on the European audiovisual industry (film, television, home video, new media). Currently 35 European States as well as the European Community are members of the Observatory. The Observatory functions within the framework of an enlarged partial agreement of the Council of Europe and carries out its mission with a network of partners, correspondents and professional organisations. Collection and publication of statistics is one of the important activities of the Observatory. General strategy, methodological issues, databases and recent results will be presented.Créé en décembre 1992, l’Observatoire européen de l’audiovisuel est un organisme de service public consacré à la collecte et à la diffusion de l’information sur l’industrie audiovisuelle (cinéma, télévision, vidéo, nouveaux médias) en Europe. Trente-cinq États européens en sont membres ainsi que la Communauté européenne. L’Observatoire fonctionne dans le cadre d’un Accord partiel élargi du Conseil de l’Europe et remplit sa mission avec un réseau de partenaires, de correspondants et d’organismes professionnels. La collecte et la diffusion d’information statistique constitue une de ses activités principales. On en présentera la stratégie générale, les principaux problèmes méthodologiques, la mise au point de diverses bases de données ainsi que quelques résultats récents

La production indépendante aux Etats-Unis

editorial reviewedNote d electure Cicchetti, C. et al., The Economic Consequence of Independent Film Making. A Report of Arthur Andersen Economic Consulting and Arthur Andersen LLP for American Film Market ing Association, AFMA, Los Angeles, January 1995

« Le Grand Prix Eurovision de la Chanson : chansons de divertissement ou chansons de diversion ? »,

editorial reviewe

Entwicklung einer hocheffektiven Magnetfeldabschirmung für die Forschungsraketenmission MAIUS-1

The goal of the MAIUS-1 sounding rocket mission is the realization of the first Bose-Einstein-Condensate and following atom interferometry measurements in space. The hardware of this experiment is specifically designed to match the requirements of a sounding rocket mission. Since the different techniques to create a Bose-Einstein-Condensate like magneto-optical traps and the following atom interferometry methods are very sensitive to external magnetic fields, a effective magnetic shielding is necessary. In this work the design and also the magnetic properties and flight-readiness test procedures are described in great detail. The three-layer magnetic shielding provides a high shielding effectiveness factor of S 1000 for an undisturbed operation of the experiment. With this magnetic shielding it was possible to create the first Bose-Einstein-Condensate in space during the flight of the MAIUS-1 sounding rocket