Study of radiation damage in silicon detectors for high ... - F9
Study of radiation damage in silicon detectors for high ... - F9
Study of radiation damage in silicon detectors for high ... - F9
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3Ir<strong>radiation</strong> Facility3.1 The ReactorThe reactor research centre <strong>of</strong> the Jozef Stefan Institute is located <strong>in</strong> Podgorica nearLjubljana. It is the site <strong>of</strong> an experimental nuclear reactor <strong>of</strong> type TRIGA, constructedto provide neutrons <strong>for</strong> experimental purposes. It can be run with large span <strong>in</strong> operat<strong>in</strong>gpower (few Wto250kW),enabl<strong>in</strong>g ir<strong>radiation</strong>s with various neutron uxes at the sameir<strong>radiation</strong> site.The ma<strong>in</strong> part <strong>of</strong> the reactor is its core, consist<strong>in</strong>g <strong>of</strong> fuel and control rods. It issurrounded by a graphite reector and placed <strong>in</strong>to a reactor vessel lled with water, allwith<strong>in</strong> a thick concrete shield (g. 3.1). Ir<strong>radiation</strong> sites can roughly be divided <strong>in</strong>to twogroups. Vertical channels are giv<strong>in</strong>g access to ir<strong>radiation</strong> sites at the edge <strong>of</strong> the core oreven <strong>in</strong> its centre, occupy<strong>in</strong>g a fuel rod position. In those, space available <strong>for</strong> a sampleis <strong>high</strong>ly limited (less than 2.5 cm diameter and 15 cm length). Horizontal ir<strong>radiation</strong>channels are lead<strong>in</strong>g to ir<strong>radiation</strong> sites some distance from the core. They can conta<strong>in</strong>dierent materials to modify the neutron spectrum <strong>in</strong> the particular channel. In the scope<strong>of</strong> the present work, one horizontal and one vertical channel were exploited to achieve thedesired ir<strong>radiation</strong> conditions.3.2 Selection <strong>of</strong> Ir<strong>radiation</strong> SiteThe properties <strong>of</strong> ir<strong>radiation</strong> channels to be used were determ<strong>in</strong>ed by the requested ir<strong>radiation</strong>conditions. Those were: Neutron spectrum with a signicant portion <strong>of</strong> fast neutrons (above 0.1 MeV). Flux <strong>of</strong> fast neutrons <strong>of</strong> the order 10 9 n/cm 2 s or <strong>high</strong>er.35