Diamond Detectors for Ionizing Radiation - HEPHY

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CHAPTER 7. RADIATION HARDNESS 46 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0 10 -4 10 -3 10 -2 10 -1 1 10 10 2 Figure 7.8: The d c development with photon irradiation, normalized to the initial unpumped value. normalized charge collection distance [ ] 1.2 1 0.8 0.6 0.4 0.2 0 0 1 2 3 4 5 (24 GeV/c protons) fluence [10 15 /cm 2 ] Figure 7.9: The charge collection distance vs. proton uence, normalized to the initial pumped value. This is in qualitative agreement with the observed d c decrease. A coarse estimation suggests that diamond detectors are technically feasible as tracking detectors up to a hadronic uence of at least 10 15 particles cm ,2 , ten times more than present silicon detectors allow. As discussed with the pion irradiation (section 7.3.1), diamond samples with higher initial collection distance are more aected by radiation than those of low quality. Furthermore, this also applies to regions of higher and lower local collection distance within a single sample. Thus, the irradiation has almost no eect on the rising edge of the Landau distribution. For the potential application as a detector with a certain trigger threshold at a few thousand electrons, the eciency is less aected than suggested by the collection distance decrease. Alpha particles are known to damage solid state detectors by a factor of 100 to 1000 more than minimum ionizing particles. The measured data agrees with this factor.
CHAPTER 7. RADIATION HARDNESS 47 normalized ccd [ ] 2.25 2 1.75 1.5 1.25 1 0.75 0.5 0.25 0 10 8 10 9 10 10 10 11 10 12 10 13 10 14 10 15 10 16 fluence [n/cm 2 ] Figure 7.10: The development of the charge collection distance, normalized to the initial unpumped value, during the pumping process under a 90 Sr source and with neutron irradiation. Dose (MGy) Normalized gain 1 0.8 0.6 0.4 0.2 0 10 10 10 11 10 12 10 13 10 14 10 15 10 16 Fluence (α/cm 2 ) Figure 7.11: The d c development with irradiation. d c =d c0 after Hadron 10 15 cm ,2 5 10 15 cm ,2 Proton 1 0.6 Pion 0.6 Neutron 0.8 Table 7.1: Normalized decrease of the charge collection distance after irradiation with dierent hadrons.
Page 1 and 2: Diploma Thesis Diamond Detectors fo
Page 3 and 4: CONTENTS 3 7 Radiation Hardness 37
Page 5 and 6: CHAPTER 1. SYNOPSIS 5 primarily sil
Page 7 and 8: CHAPTER 2. INTRODUCTION 7 Figure 2.
Page 9 and 10: Chapter 3 Material Properties 3.1 G
Page 11 and 12: CHAPTER 3. MATERIAL PROPERTIES 11 Q
Page 13 and 14: CHAPTER 3. MATERIAL PROPERTIES 13 d
Page 15 and 16: Chapter 4 Solid State Detector Theo
Page 17 and 18: CHAPTER 4. SOLID STATE DETECTOR THE
Page 19 and 20: CHAPTER 4. SOLID STATE DETECTOR THE
Page 21 and 22: CHAPTER 5. DETECTOR MATERIAL COMPAR
Page 27 and 28: CHAPTER 6. CHARACTERIZATION 27 6.1.
Page 29 and 30: CHAPTER 6. CHARACTERIZATION 29 and
Page 31 and 32: CHAPTER 6. CHARACTERIZATION 31 Lid
Page 33 and 34: CHAPTER 6. CHARACTERIZATION 33 Figu
Page 35 and 36: CHAPTER 6. CHARACTERIZATION 35 300
Page 37 and 38: Chapter 7 Radiation Hardness 7.1 Ra
Page 39 and 40: CHAPTER 7. RADIATION HARDNESS 39 7.
Page 41 and 42: CHAPTER 7. RADIATION HARDNESS 41 Ca
Page 43 and 44: CHAPTER 7. RADIATION HARDNESS 43 ev
Page 45: CHAPTER 7. RADIATION HARDNESS 45 2
Page 49 and 50: CHAPTER 8. DETECTOR GEOMETRIES 49 F
Page 51 and 52: CHAPTER 8. DETECTOR GEOMETRIES 51 S
Page 53 and 54: CHAPTER 8. DETECTOR GEOMETRIES 53 i
Page 55 and 56: Chapter 9 Summary The possible appl
Page 57 and 58: Acknowledgements First of all, I am
Page 59 and 60: APPENDIX A. ABBREVIATIONS AND SYMBO
Page 61 and 62: APPENDIX A. ABBREVIATIONS AND SYMBO
Page 63 and 64: Bibliography [1] Austrian Academy o
Page 65: BIBLIOGRAPHY 65 [29] A. Hrisoho, Fr

Diamond Detectors for Ionizing Radiation - HEPHY

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