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Self-sustained detachment has been obtained in the Large Helical Devise (LHD). Strong hydrogen gas puffing of ~200 Pa·m3/s after a density feedback phase successfully detaches the plasma from the divertor plate with high reproducibility. High electron density of over 1 × 1020 m–3 is sustained without gas puffing until the heating beam stops and the high-density flat top for 2 seconds has been demonstrated. Throughout the detachment phase, the minor radius of the hot plasma column shrinks to ~90 % of the last closed flux surface, which corresponds to the ι /2π = 1/q = 1 rational surface.

Sustained Detachment with the Self-Regulated Plasma Edge beneath the Last Closed Flux Surface in LHD