Long sustainment of quasi-steady-state high βp H mode discharges in JT-60U

摘要

Quasi-steady-state high βp H mode discharges performed by suppressing neoclassical tear- ing modes (NTMs) are described. Two operational scenarios have been developed for long sustainment of the high βp H mode discharge: NTM suppression by profile optimization, and NTM stabilization by local electron cyclotron current drive (ECCD)/electron cyclotron heating (ECH) at the magnetic island.