Abstract
High‐power electron cyclotron (EC) waves are used to increase performance in several Advanced Tokamak (AT) regimes on DIII‐D where there is a simultaneous need for high noninductive current and high beta. In the Quiescent High‐confinement mode (QH‐mode), a direct measurement of the electron cyclotron current drive (ECCD) profile is made using modulation techniques, and a trapped electron mode (TEM) dominated regime with core Te>Ti is created. In the “highqmin” AT scenario, ECCD provides part of the off‐axis noninductive current and helps to produce a tearing stable equilibrium. In the hybrid regime, strong central current drive from EC waves and other sources increases the noninductive current fraction to ≈100%. Surprisingly, the core safety factor remains above unity, meaning good alignment between the current drive profile and the desired plasma current profile is not necessary in this scenario.
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