Disruptions and Mitigation

A disruption is a sudden loss of confinement that dumps energy and current into the machine; predicting and mitigating them is essential for a compact device.

The failure mode to avoid

A disruption is the rapid, unplanned collapse of a tokamak discharge. The stored thermal energy is dumped in milliseconds, the plasma current decays and can drive large forces in surrounding structures, and the collapse can generate runaway electrons — a beam of high-energy electrons that can damage plasma-facing components. Disruptions are the most demanding transient a tokamak must tolerate.

On a compact, high-current, high-field machine the loads are concentrated onto small areas and short times, making disruptions relatively more severe per unit area than on a large device. Hyperion's 9.66 MA and 85.0 MW are exactly the quantities a disruption would dump, so the machine cannot rely on merely surviving disruptions — it must avoid and mitigate them.

Avoidance and mitigation

The strategy is layered: operate with margin inside stability limits, detect the precursors of an impending disruption in real time, and if one is unavoidable, mitigate it — for example by injecting material to radiate the stored energy uniformly and benignly rather than letting it land on a single surface. This ties the disruption problem to the active control stack, and quantifying disruption loads and mitigation effectiveness for Hyperion is design-and-simulation work.

• Disruption dumps thermal energy, current forces, and runaway electrons
• Compact machines concentrate the loads — more severe per area
• Layered response: margin, real-time detection, mitigation injection

This page describes a design-and-simulation study, not a built machine. Construction begins Q2 2027; first-of-a-kind first tritium is targeted near 2030. No hardware net-gain is claimed before FOAK.