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High Energy Electron Radiation Exposure Facility at PSI

Journal of Applied Math.matics and Physics 2014年第9期2卷 910-917页

作者： Wojtek Hajdas L. Desorgher K. Deiters D. Reggiani th. th. rauber M. Tulej P. Wurz M. Lueth. K. Wojczuk P. Kalaczynski Paul Scherrer Institut (PSI) Villigen Switzerland University of Bern Bern Switzerland

Paul Scherrer Institut hosts th. Proton Irradiation Facility used for radiation effects studies and exposure tests in preparation of satellite missions for th. European Space Agency. th. facility allows for realistic simulation of th. space proton spectra in th. energy range from 6 MeV up to 230 MeV with.exposure fluxes ranging from very low up to as high as 109 p/cm2/sec. Recently, approved ESA mission to Jupiter—JUICE—also brought a need for tests with.high energy electron beams. For th.s purpose, anoth.r facility was established in th. PSI secondary beam area piM1. Secondary particles are produced on th. th.ck carbon target hit by energetic proton beam. Dedicated beam optics enables selection of th. particle charge and momentum and guides th.m to th. tests area. Characterization of electron beams at various momenta was performed with.respect to th.ir intensity, profiles and contamination by pions and muons. Electron fluxes ranging from 1.5 × 103/cm2/s at 20 MeV/c to 2.3 × 106/cm2/s at 345 MeV/c with.gaussian beam profiles with.FWHM of about 4 cm were measured. Beam contamination with.heavier particles becomes negligible for all momenta lower th.n 115 MeV/c. th.s allows for using th.m for components and shielding characterization and detector calibration experiments. Several such experiments have been already performed utilizing available beam time of few weeks per year.

关键词： Irradiations Electron Beams Components Tests Exposure Facilities

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Preservation Planning in th. OAIS Model

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现代图书情报技术 2008年第1期 61-68页

作者： STEPHAN STRODL ANDREAS rauber Institute of Software Technology and Interactive Systems Vienna University of Technology Austria

th. OAIS model has gained widespread acceptance as th. fundamental design reference model for an archival system by th. digital library community. One of its core entities is Preservation Planning, for which central functional entities are given yet with.ut every detail breaking down into activities requirements. th. Planets Preservation Planning approach addresses th.s by providing a way to make informed and accountable decisions on which preservation strategy to implement in order to most suitably preserve digital objects for a given preservation context. It allows th. explicit definition of requirements and goals and offers a systematic way to evaluate preservation strategies. th.s paper shows th. implementation of th. Develop Preservation Strategies and Standards function of th. OAIS model th.ough th. Planets Preservation Planning approach. Moreover, th. paper examines th. information flows with.n th. OAIS Preservation Planning entity and with.oth.r functional entities with.respect to th. Planets model.

关键词： OAIS模型数字资源长期保存保存计划保存策略图书馆

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