First-Plasma Milestone

First plasma in the burner test unit marks the transition from simulation to operating hardware — a beginning, not a performance claim.

The first real plasma

First plasma is when the burner test unit first confines a plasma in its tandem-mirror configuration. It is a genuine milestone: the machine exists, the magnets energize, and the plasma forms. But it is the start of the measurement campaign, not a demonstration of firm power.

At first plasma the machine is characterized — field profiles, plasma formation, basic confinement — against the design predictions. Discrepancies here are expected and valuable; they calibrate the models before the harder confinement and burn tests.

What it does and does not show

• Shows: the machine operates and forms a plasma as configured.
• Shows: first data on fields and formation vs prediction.
• Does not show: sustained burn, net electric output, or firmness.

Programs sometimes over-signal first plasma. MetroVolt treats it as milestone one of several — necessary, encouraging, and far short of the confinement and direct-conversion results that actually gate the commercial decision.