Event rates were calculated for LEO(ISS) and GEO
environments by combining CREME96 orbital integral flux estimations and simplified
SEE cross-sections according to methods shown in Heavy Ion Orbital Environment
Single-Event Effects Estimations. Assume a minimum shielding
configuration of 100mils (2.54mm) of aluminum, and worst-week solar activity
(this is similar to a 99% upper bound for the environment). Using the 95%
upper-bounds, the event rate calculation for the SEL is shown in Table 8-1. It is important to note that this number is for reference since no SEL events
were observed. SET orbit rate for the output at VIN = 12V with VCM = 12V,
15V, and 48V is shown in Table 8-2, Table 8-3, and Table 8-4.
Table 8-1 SEL Event Rate Calculations for Worst-Week LEO and GEO Orbits:
| Orbit Type |
Onset LETEFF (MeV-cm2 /
mg) |
CREME96 Integral FLUX ( / day /
cm2) |
σSAT (cm2) |
Event Rate ( / day) |
Event Rate (FIT) |
MTBE (Years) |
| LEO (ISS) |
2.8 |
5.29E-07 |
1.23E-07 |
6.5E-14 |
2.71E-06 |
4.21E+10 |
| GEO |
1.38E-06 |
1.7E-13 |
7.08E-06 |
1.61E+10 |
Table 8-2 SET Event Rate Calculations for Worst-Week LEO
and GEO Orbits: VCM 12V| Orbit Type | Onset LETEFF (MeV-cm2 / mg) | CREME96 Integral FLUX ( / day / cm2) | σSAT (cm2) | Event Rate ( / day) | Event Rate (FIT) | MTBE (Years) |
|---|
| LEO (ISS) | 2.8 | 3.36E+02 | 1.22E-03 | 4.08E-01 | 1.70E+07 | 6.71E-03 |
| GEO | 3.22E+03 | 3.92E+00 | 1.63E+08 | 6.99E-04 |
Table 8-3 SET Event Rate Calculations for Worst-Week LEO
and GEO Orbits - VCM 15V| Orbit Type | Onset LETEFF (MeV-cm2/ mg) | CREME96 Integral FLUX ( / day / cm2) | σSAT (cm2) | Event Rate ( / day) | Event Rate (FIT) | MTBE (Years) |
|---|
| LEO (ISS) | 2.8 | 3.36E+02 | 1.31E-03 | 4.41E-01 | 1.84E+07 | 6.21E-03 |
| GEO | 3.22E+03 | 4.23E+00 | 1.76E+08 | 6.48E-04 |
Table 8-4 SET Event Rate Calculations for Worst-Week LEO
and GEO Orbits: VCM 48V| Orbit Type | Onset LETEFF (MeV-cm2/ mg) | CREME96 Integral FLUX ( / day / cm2) | σSAT (cm2) | Event Rate ( / day) | Event Rate (FIT) | MTBE (Years) |
|---|
| LEO (ISS) | 2.8 | 3.36E+02 | 1.32E-03 | 4.44E-01 | 1.85E+07 | 6.17E-03 |
| GEO | 3.22E+03 | 4.26E+00 | 1.77E+08 | 6.43E-04 |
Figure 8-1 Weibull Fit Curve: VCM 12V
Figure 8-2 Weibull Fit Curve - VCM 15V
Figure 8-3 Weibull Fit Curve: VCM 48V