Application of software and hardware components of CAN-technology for accelerator control

CAN-technology was developed for embedded hard real time automotive applications. CAN-bus together with high-level application protocols is used now to control large experimental installations and particle accelerators. CAN-technology includes fieldbus, universal and specialized controllers, sensors and actuators. Software components of CAN-technology consist of high level application protocols, programs for testing, monitoring and configuring of CAN-nodes as well as the components which bind CAN-components with SCADA systems and ensure control through the WEB-browsers. CAN-technology is used in INP to control accelerators, for beam diagnostic and, in cooperation with the RRC Kurchatov Institute, in automation of the large neutrino detector Borexino. CAN-bus adapters for PC have been constructed. Such software components as drivers for PC adapters, the bus emulator and protocol analyzers have been developed under Linux. Original specialized high level protocols have been developed for closed specialized systems. Source codes have been developed and verified for compatibility with international standards such as DeviceNet and CANopen for use in the systems that are supposed to be extended with commercially available software and hardware components. Long-term positive experience of CAN-technology usage allows us to recommend this technology for accelerator control especially if industrial style and compatibility is desired.CAN технологія була розроблена для застосування як убудовану мережу жорсткого реального часу для автоелектроніки. У НІДЯФ МГУ технологія CAN застосовується для контролю і керування прискорювачами, діагностики пучка і, разом із РНЦ Курчатовський Інститут, для автоматизації великого нейтринного детектора Borexino. Багаторічний позитивний досвід роботи з CAN і експлуатація систем керування з CAN дозволяє рекомендувати цю технологію для побудови систем керування прискорювачами.CAN технология была разработана для применения в качестве встроенной сети жесткого реального времени для автоэлектроники. В НИИЯФ МГУ технология CAN применяется для контроля и управления ускорителями, диагностики пучка и, совместно с РНЦ Курчатовский Институт, для автоматизации большого нейтринного детектора Borexino. Многолетний позитивный опыт работы с CAN и эксплуатация систем управления с CAN позволяют рекомендовать эту технологию для построения систем управления ускорителями

Specific features of the luminescence and conductivity of zinc selenide on exposure to X-ray and optical excitation

The set of experimental data on the X-ray-excited luminescence and X-ray induced conductivity of ZnSe are compared to the data on the photoluminescence and photoconductivity. It is experimentally established that the current-voltage characteristics and the kinetics of phosphorescence and current relaxation depend on the type of excitation. It is found that the external electric field influences the intensity and shape of bands in the luminescence spectra. It is shown that the character of excitation defines the kinetics of recombination, charge carrier trapping, and conductivity in wide-gap semiconductors.Comment: 7 pages, 7 figures, published in Fizika i Tekhnika Poluprovodnikov, 2010, Vol. 44, No. 5, pp. 594-59