The radiation safety access control at GANIL and the RiB SPIRAL facility

International audienc

Progress in the Understanding of Preferential Enrichment

International audienc

Straightforward synthesis of tri- and tetra-substituted 3-trifluoromethylfurans by heterocyclization reaction of perfluoroketene dithioacetals

International audienceVarious 2-ethylsulfanyl-3-trifluoromethylfurans were obtained, in moderate to good yields, using a two-step procedure, from perfluoroketene dithioacetals as starting materials. Reaction tolerated a large variety of substituents on the furan nucleus. Mechanism of cyclization was also proposed based on the electronic properties of aryl and heteroaryl substituents

The new accelerator control system of GANIL

International audienceThe new computer control system has operated the heavy ion accelerator GANIL from the beginning of 1993 and has reached a state of routine operation. It supersedes the obsolete initial system to cope with the harsh experimental conditions required by the very high intensity beams expected in the near future. Hardware and software implementations, as well as the human interface, are presented. Emphasis is placed on the three-layer distributed architecture adopted. An Ethernet local area network (LAN) links the basic components: a VAX/VMS cluster, XWINDOWS-interfaced operator consoles, VAXELN-driven CAMAC crate controllers and programmable logic controllers for the front end controls. Also the data management, through the INGRES relational database management system (RDBMS), as well as the operating software written in ADA, are described. The early experience with the new control system is reported and future developments discussed