1. 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)

2. Decay of CVD signal during neutron irradiation

3. Decrease of CCD vs fluence with 26 MeV protons

4. 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

5. Radiation damage in Diamond
Z Ions NIEL
Total
10 GeV protons
Z Ion NIEL
Total n p
Si elastic
Si inelastic
Si total
C total
C elastic
C inelastic Si C
200 MeV

6. 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.