Consolidation of the 45-Year Old PS Main Magnet System

After a major coil insulation breakdown on two of the 47-year-old CERN PS main magnets in 2003, an extensive magnet consolidation program has been launched. This article reviews the analysis of the magnet state be-fore the repair and the applied major improvements. An overview is given of the production of the new compo-nents, the actual refurbishment and the commissioning of the main magnet system after 18 months shutdown

Development of an enhanced dielectric insulation for the PS Bus Bars

This document reports about the development of an enhanced dielectric insulation for the magnet bus bars installed in the PS accelerator. The bus bars connect the hundred and one individual main magnets of the PS in series from the terminal connection to the ring magnets. There are 8 different type of bus bars, which are presently no longer covered by operational spare units. It is planned first to re-establish the required spare stock by manufacturing new bus-bars and therafter, to be potentially capable of replacing all the PS bar bars with new ones in case of possible future evidence of systematic end of life degradation

Suivi de l’activité des dunes au Niger au moyen de la cohérence interférométrique ERS ½

Le sud-est nigérien est menacé par la réactivation de dunes anciennes autrefois fi xées par la végétation. Cette remise en mouvement des sables est expliquée par la raréfaction de la couverture végétale des sols suite aux effets conjugués des sécheresses et des actions anthropiques. L’information de cohérence interférométrique SAR (Synthetic Aperture Radar) offre une mesure originale et unique de la dynamique et des changements de surface qui ont lieu entre deux acquisitions SAR. La mission ERS 1/2 tandem permet l’acquisition de paires à seulement 24 heures d’intervalle. Grâce à cette base temporelle exceptionnelle, les images de cohérence tandem combinées avec les images d’amplitude ont permis de détecter les zones de sable actives sur 24 heures ainsi que les zones de végétation oasienne et certains chemins et villages. Sept couples d’images ERS 1/2 ont été acquis avec 1 jour d’intervalle, tous en saison sèche, sur la zone d’étude : deux sur la région de Gouré en décembre 1995 et avril 1996, deux à Goudoumaria en avril 1996 et novembre 1998 et trois à Maïné-Soroa en décembre 1995, avril 1996 et février 1999. Sur chacune de ces zones, l’analyse temporelle de la cohérence tandem a pu mettre en évidence l’extension des zones sableuses actives au cours du temps et la migration de dunes. La co-hérence tandem semble donc un très bon outil pour la cartographie de l’activité dunaire, ainsi que pour le suivi des mouvements de dunes et l’ensablement.SE Niger is threatened by the reactivation of dunes formerly fi xed by vegetation. The sand remobilization results from a decreased soil cover by the vegetation following repeated droughts and human interventions. The SAR (Synthetic Aperture Radar) interferometric coherence provides a unique measure of the surface changes and dynamics between two SAR acquisitions. The 1/2 tandem ERS mission allows a pair of images to be obtained at only 24 hours interval, so that the combination of tandem coherence and amplitude images enables the detection of active sand areas, oasis vegetation, and even villages and some cattle tracks. Seven pairs of ERS 1/2 images at one day interval during the dry season have been processed: two in the Gouré area in December 1995 and April 1996, two at Goudoumaria in April 1996 and November 1998, and three at Maïné-Soroa in December 1995, April 1996 and February 1999. The temporal analysis of the tandem coherence identifi ed the active sand areas and migrating dunes in all sub-areas. The SAR tandem coherence thus proves to be an effec-tive tool for mapping the dune activity and for monitoring the sand displacements

Intrathoracic Lymphadenitis Caused by Mycobacterium avium and Mycobacterium tuberculosis in an Immunocompetent Child.

By means of a DNA probe assay (INNO-LiPA) we identified 2 different mycobacterial strains (Mycobacterium avium and Mycobacterium tuberculosis complex) from a mediastinal lymph node biopsy obtained from an apparently immunocompetent 7.5-year-old girl, whereas culture grew only M. avium. Clinicians should be aware of the possible occurrence of mixed infection involving both nontuberculous mycobacteria and M. tuberculosis

Impact of sucrose and water contents on macroscopic structure and stability of cereal based products : Thermodynamic versus dynamic

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A Novel Field Cage Design for the CPS IPM and Systematic Errors in Beam Size and Emittance

An ionization profile monitor has been recently installed in the CERN proton synchrotron. We design a novel and simple structure field cage that suppresses the secondary electrons that are induced by the ionized ions. We discuss a field cage design, and the systematic error on the basis of beam size and emittance, considering the non-uniformity of the fields, the space-charge effect of the beam, and the lattice parameter errors.A residual gas ionization profile monitor has been recently installed in the CERN proton synchrotron. We present the design for a novel and simplified field cage structure that suppresses the secondary electrons that are induced by the ionized ions. We discuss the field cage design and the beam size and emittance systematic error considering the non-uniformity of the fields, the space-charge effect of the beam, and the lattice parameter errors.An ionization profile monitor has been recently installed in the CERN proton synchrotron. We present the design for a novel and simplified field cage structure that sup- presses the secondary electrons that are induced by the ionized ions. We discuss the field cage design and the beam size and emittance systematic error considering the non-uniformity of the fields, the space-charge effect of the beam, and the lattice parameter errors

Pneumonie nécrosante de l'enfant: à propos de 4 cas.

OBJECTIVES: To describe the necrotizing pneumonia in children, a severe affection which prevalence seems to increase; to review literature. PATIENTS AND METHODS: We report 4 cases of necrotizing pneumonia: symptoms, agents, diagnostic tools, treatment and long term evolution. RESULTS: In 2 cases, pneumatoceles could be seen at chest X-ray. Two patients presented a deficiency of anti-pneumococcal antibodies. Three needed insertion of a pleural chest tube of whom 1 had a resection of a small piece of necrotic lung. Duration of hospitalisation is longer than in uncomplicated pneumonias. CONCLUSION: Necrotizing pneumonia is a severe affection. Diagnosis has to be made by lung CT. Long term evolution is excellent in pediatric population with serious management at hospital.Objectifs Décrire la pneumonie nécrosante chez l'enfant, affection sévère dont la prévalence semble augmenter, avec une revue de la littérature. Patients et méthode Nous décrivons 4 cas de pneumonie nécrosante : symptomatologie, étiologie, mise au point radiologique et générale, prise en charge et évolution. Résultats Dans 2 observations, des pneumatocèles étaient visibles à la radiographie standard des poumons. Deux de nos patients présentaient un déficit en Ac antipneumocoques. Trois ont nécessité la mise en place d'un drain pleural dont 1, la résection d'un segment de poumon nécrotique. La durée d'hospitalisation a été prolongée par rapport aux pneumonies non compliquées. Conclusion La pneumonie nécrosante est une affection sévère dont le diagnostic devrait être posé à l'aide d'une tomodensitométrie thoracique. L'évolution à long terme est favorable dans la population pédiatrique, moyennant une prise en charge lourde en milieu hospitalier