A SIMPLE ALGORITHM FOR PREDICTING PROTON SEU RATES IN-SPACE COMPARED TO THE RATES MEASURED ON THE CRRES SATELLITE

A new simulation code, the Clemson Onmidirectional Spallation Model fo r Interaction in Circuits (COSMIC), is described and its predictions a gree with SEU data from four devices flown as part of the microelectro nics package experiment on the CRRES satellite. The code uses CUPID fo r determining the energy depositions in the sensitive volumes; it allo ws proton exposures with arbitrary angles of incidence including rando m omnidirectional exposure; and the user specifies the thickness of sh ielding on six sides of the sensitive volume. COSMlC is used as part o f an algorithm developed to predict the rate proton induced single eve nt upsets occur in the space radiation environment given by AP-8. In t esting the algorithm, the position coordinates are taken from the sate llite's ephemeris data, but calculations based on position coordinates from orbital codes were also in agreement with the measured values.