Radiation damage in Diamond

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Presentation transcript:

Radiation damage in Diamond Comparison of radiation damage in Si and Diamond WdB, H. Bol, A. Furgeri, S. Mueller (Univ. Karlsruhe) M. Pomorski, E. Berdermann (GSI) M. Huhtinen (CERN)

Decay of CVD signal during neutron irradiation

Decrease of CCD vs fluence with 26 MeV protons

Calculation of NIEL curve Conclusion: diamond not very radiation hard for low energy protons. Reason? First question: does NIEL hypothesis work? Implying: CCD  defects. Can be calculated by SRIM. Disadvantage: SRIM calculates only Coulomb scattering Solution: go to Mika Huhtinen. 1) he calculates nuclear interaction to elastic scattering 2) he calculates fragments with energy spectrum Calculate defects from fragments by SRIM again

Radiation damage in Diamond Z Ions NIEL 14 417 4.2 13 910 9.06 12 1384 12.47 11 1021 8.86 10 1225 8.45 9 265 1.41 8 493 2.09 7 398 1.31 6 909 2.36 5 270 0.55 4 383 0.66 3 662 0.67 2 11152 4.4 1 46107 0.9 Total 6559 57.38 10 GeV protons Z Ion NIEL 6 698 0.8 5 869 0.77 4 584 0.44 3 1133 0.55 2 10625 2.01 1 30465 0.24 Total 44374 4.81 n p Si elastic Si inelastic Si total C total C elastic C inelastic Si C 200 MeV

Conclusion Radiation damage at HIGH energy dominated by inelastic cross section. C-nuclei smaller and more stable than diamond. Diamond order of magnitude better than Silicon. Radiation damage at LOW energy dominated by elastic cross section. C-nuclei have factor two smaller Z than Si and higher displacement energy (≈40 keV vs 20 keV) Diamond only factor three better than Silicon.