Study of radiation damage in silicon detectors for high ... - F9

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34 2. Operation and Radiation Damage of Silicon Detectors2.4.2 Time Evolution of N effResults on the N eff time development show that all three types of defects are taking partin the time development of defects contributing to the space charge in the depleted region(g. 2.8). While the annealing part can be described with a sum of exponentials likethe leakage current and thus indicates decays of active defects, the nature of the reverseannealing part is not fully understood yet. The time development of the N eff can thusbe parametrised asN eff (t) =N C + X iN i e ;t= i+ N Y (t) (2.65)where N C represents defects constant in time, N i defects that anneal with time constants i and N Y defects responsible for the reverse annealing. 16 Depending on the reactionsresponsible for reverse annealing, N Y (t) is described by equations 2.57, 2.59 or 2.61,depending on the type of reaction(s) responsible for the reverse annealing. Agreement ofthe measured results with dierent options will be presented later in this work.*16Defects contributing to the charge in the SCR are not necessarily the same as those contributing tothe leakage current, thus also time constants may dier.
3Irradiation Facility3.1 The ReactorThe reactor research centre of the Jozef Stefan Institute is located in Podgorica nearLjubljana. It is the site of an experimental nuclear reactor of type TRIGA, constructedto provide neutrons for experimental purposes. It can be run with large span in operatingpower (few Wto250kW),enabling irradiations with various neutron uxes at the sameirradiation site.The main part of the reactor is its core, consisting of fuel and control rods. It issurrounded by a graphite reector and placed into a reactor vessel lled with water, allwithin a thick concrete shield (g. 3.1). Irradiation sites can roughly be divided into twogroups. Vertical channels are giving access to irradiation sites at the edge of the core oreven in its centre, occupying a fuel rod position. In those, space available for a sampleis highly limited (less than 2.5 cm diameter and 15 cm length). Horizontal irradiationchannels are leading to irradiation sites some distance from the core. They can containdierent materials to modify the neutron spectrum in the particular channel. In the scopeof the present work, one horizontal and one vertical channel were exploited to achieve thedesired irradiation conditions.3.2 Selection of Irradiation SiteThe properties of irradiation channels to be used were determined by the requested irradiationconditions. Those were: Neutron spectrum with a signicant portion of fast neutrons (above 0.1 MeV). Flux of fast neutrons of the order 10 9 n/cm 2 s or higher.35
Page 1: UNIVERSITY OF LJUBLJANAFACULTY OF M
Page 5: Najprej gre moja zahvala delovnima
Page 8 and 9: PovzetekSevalne poskodbe v siliciju
Page 10 and 11: 3.5 Measurement Setup, Methods and
Page 13 and 14: 1IntroductionSilicon detectors play
Page 15 and 16: 1. Introduction 7Figure 1.2: Schema
Page 17 and 18: 1. Introduction 9R(cm)Z(cm)Figure 1
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5. Dose Rate Dependence 85Figure 5.
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5. Dose Rate Dependence 87could be
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6Inuence of Bias VoltageIt was a ge
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6. Inuence of Bias Voltage 91energy
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6. Inuence of Bias Voltage 93Figure
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6. Inuence of Bias Voltage 99that t
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6. Inuence of Bias Voltage 101(abou
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6. Inuence of Bias Voltage 103Figur
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7Comparison with Other GroupsWhile
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7. Comparison with Other Groups 107
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8ConclusionsA systematic study of r
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8. Conclusions 111Implications for
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9Povzetek doktorskega dela9.1 UvodS
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9. Povzetek doktorskega dela 115Ski
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9. Povzetek doktorskega dela 117sre
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9. Povzetek doktorskega dela 1199.2
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9. Povzetek doktorskega dela 121Sli
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9. Povzetek doktorskega dela 123Ce
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9. Povzetek doktorskega dela 127Cep
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9. Povzetek doktorskega dela 129Mer
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9. Povzetek doktorskega dela 131Sam
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9. Povzetek doktorskega dela 1379.6
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10Appendix: List of Symbols and Abb
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10. Appendix: List of Symbols and A
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References[1] J. Straver et al., Nu
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[27] A.M. Ougang et al.: Dierential
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[57] M. Huhtinen et al, HU-SEFT-R-1
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Izjavljam, da je disertacija rezult
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