Monte Carlo evaluation of spatial multiple-bit upset sensitivity to oblique incidence

We investigate the impact of heavy ion irradiation on a hypothetical static random access memory （SRAM） device. Influences of the irradiation angle, critical charge, drain-drain spacing, and dimension of device structure on the device sensitivity have been studied. These prediction and simulated results are interpreted with MUFPSA, a Monte Carlo code based on Geant4. The results show that the orientation of ion beams and device with different critical charge exert indis- pensable effects on multiple-bit upsets （MBUs）, and that with the decrease in spacing distance between adjacent cells or the dimension of the cells, the device is more susceptible to single event effect, especially to MBUs at oblique incidence.