Single-Event Effects (SEE): Overview
A single energetic particle can flip a bit or damage a device; SEE testing measures how electronics behave under that kind of hit.
One particle, one event
A single-event effect happens when one energetic particle deposits enough charge in a microelectronic device to change its state or harm it. Unlike gradual dose effects, an SEE is a discrete event: a bit flips, a latch sticks, or, in severe cases, a transistor is destroyed. For systems that must not fail, this behavior has to be measured, not assumed.
Families of single-event effects
- Soft errors: recoverable bit flips (SEU, MBU)
- Transients: brief voltage glitches (SET)
- Functional interrupts: device hangs (SEFI)
- Hard failures: latch-up and burnout (SEL, SEB, SEGR)
Why neutrons
At ground level and in the atmosphere, high-energy neutrons are a leading cause of soft errors in electronics. A 14 MeV neutron source reproduces the interactions, chiefly neutron-induced recoils and secondary charged particles, that cause these upsets. That makes it a direct tool for SEE qualification.
From device to system
An SEE measurement on one part is only the start. Real systems combine many devices, each with its own cross-section, and add mitigation such as error-correcting memory, watchdog timers, and redundant channels. Predicting a system's reliability means folding the per-device cross-sections into the expected environment and then crediting the mitigation. A neutron campaign supplies the device-level inputs to that calculation and, where possible, tests the mitigated system directly to confirm the prediction. The environment inputs, the neutron flux a system will actually see, come from the mission profile, so the same device can carry very different predicted error rates depending on where and how it operates.
This is a public overview only. It contains no classified information, no operational detail, and no weapons-design content.