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Density limits are no longer one number. They are an engineering moat.

EAST shows density limits can be lifted with start-up control, while W7-X proves long pulses are possible with continuous fueling. Investors should track the enabling stack that makes both possible.

1.3-1.65x

Reported density range above the Greenwald limit (preprint).

0.8-1.0x

Typical EAST density range before the new method.

13 keV

Temperature scale for optimal D-T fusion (about 150M K).