Speaker
Dr
Nikolai Sinev
(University of Oregon)
Description
In our earlier investigations of radiation damage effects in a CCD based detector we
observed that some parameters of the radiation damage related processes were very
different from the common perception. For example, trapping time of electrons by
trapping centers created by irradiation was few orders of magnitude larger than it
was believed it should be. Last year we did additional experiments in attempt to
understand this. Results of such experiments are puzzling, though we could rule out
some of hypothesis about cause of slow trapping. However, they yielded observation
of another phenomenon, which though was predicted by the theory of radiation damage,
but was not anticipated to show up so clearly at the level of exposure we had. We
observed, that irradiation with electrons leads to slow dissolving of charge trap
clusters created by neutron irradiation. While charge trap clusters created by
neutron irradiation did not change in more than 4 years since they were created in
1999, (looking in 2003 measurements), they changed dramatically (number of traps
reduced by almost 90%) in 2 years following high energy (60 MeV) electrons
irradiation in 2003.
Primary author
Dr
Nikolai Sinev
(University of Oregon)
Co-authors
Prof.
James Brau
(University of Oregon)
Mr
Jan Strube
(University of Oregon)
Dr
Olga Igonkina
(University of Oregon)
