Modern COTS electronics are widely used for space missions because it’s difficult to find equivalent space electronics or in some cases space electronics is not available for modern IC’s like FPGAs, SoC, DAC/ADC etc. And nowadays it is a trend to plan space missions with “small” spacecrafts like CubeSats (NanoSats) to reduce cost and time to start mission. So, it’s possible to do single event effects radiation test for COTS electronics at proton accelerators only because it’s faster and less expensive than heavy ion test.