The SEU figure of merit and proton upset rate calculations
Petersen, E.L.
Nuclear Science, IEEE Transactions on
Volume 45, Issue 6, Dec 1998 Page(s):2550 - 2562
Digital Object Identifier 10.1109/23.736497
Summary:This paper re-examines the use of the SEU Figure of Merit for
heavy ion upset rate predictions. Slightly different orbit dependent
rate coefficients are used for unhardened and hardened parts. The two
different coefficients allow for the slight changes of LET spectra that
occur due to the Earth's magnetic shielding. Accurate heavy ion
predictions can be made for any orbit and any part. We show that the
Figure of Merit can also be used to predict upset rate due to protons in
the proton radiation belt. A proton rate coefficient is introduced to
describe the upset likelihood in orbits with proton exposures. These
results mean that a part susceptibility can be described by a single
parameter, rather than the four Weibull parameters and two Bendel
parameters used previously. The Figure of Merit completely describes a
part's SEU susceptibility and can be obtained from either proton or
heavy ion measurements, eliminating the expense of making both types of
experiment. The total upset rate for a part in a particular orbit can be
calculated using its characteristic Figure of Merit and a single orbit
specific rate coefficient, the sum of the heavy ion and proton rate
coefficients
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