A new method of mounting stripper foils
Résumé. 2014 Une méthode est proposée pour le montage des feuilles d’épluchage de charge utilisant une grille de tungstène à haute transmission. Cela permet de subdiviser la feuille en un grand nombre de feuilles indépendantes, le mauvais fonctionnement de l’une d’elles n’affecte pas les autres. Il est donc possible d’utiliser une grande feuille que l’on déplace dans le faisceau afin de prolonger sa durée d’utili- sation. Des résultats sont décrits ainsi qu’un mécanisme prototype pour l’exploitation de ce concept. Abstract. 2014 A method of mounting stripper foils is proposed using a high transmission tungsten grid. This enables the foil to be subdivided into a large number of independent foils, failure of any one of which does not effect the rest. It is thus possible to use a large foil moved across the beam to obtain a very long life. The results are shown and a prototype mechanism to exploit this concept is described.
USE OF CARBON FOILS FOR HEAVY-ION STRIPPERS.
Abstract The lifetime of carbon foils when bombarded by high-density heavy-ion beams is increased if the foil is kept at a high temperature.
Venus: Evolution of the Upper Atmospheric Clouds
Abstract The large number of UV photographs taken by different observatories throughout the world are grouped for analysis at the IAU Planetary Photograph Center of Meudon Observatory. Three horizontal V, Y, or psi-shaped dark-hued cloud features are usually aligned along the equator and move 110 m s−1 westward in a planetary-wide rotation. The more intense and distinctly V-Shaped features last several weeks. The smaller scale cloud structures usually show significant changes after each successive rotation in 4 days around the planet. The average UV contrast is 32% but can fluctuate from disappearance to 37%. For periods of several years, the polar areas are sometimes covered by a white cloud. According to a set of photographs taken at Pic-du-Midi, this never occurred between 1962 and 1966 but has happened during 25% of the time for at least one pole since 1967, and only when the planet was in a given half of its orbit. These polar clouds are ephemeral and usually last several weeks or months; they evolve...