A regime of improved energy confinement in beam-heated expanded-boundary discharges in Doublet III

Neutral-beam-heated expanded-boundary (XB) divertor discharges have been obtained in Doublet III with high heating efficiency for wide ranges of plasma parameters (Ip: 300–800 kA; BT: 8–24kG; e :(2–10) × 1013cm−3; Pb 3 MW), a mild deterioration of the energy confinement time has been observed.