[en] The H-mode can be achieved in NBI and/or ICRF heated open divertor discharges, and an H-transition with improved energy confinement is also observed in limiter discharges with both heating methods. The gross energy confinement time τ_EG in the H-mode recovers that of the Ohmic plasma. A large improvement in gross energy confinement is also observed after injection of a single pellet into an NBI heated plasma, where during the first 40 ms after pellet injection 70% of the NBI power is stored in the plasma. τ_EG reaches 70 ms, which is about twice the Ohmic value. In an additionally heated plasma, the incremental stored energy behaves as if it had its own energy confinement time τ_ad, which is independent of the heating power. In some cases of H-modes, τ_ad is equal to the doubled L-mode value. (author)