Recent experiments on DIII-D have shown it is possible to create and sustain wide pedestal quiescent H-mode (QH-mode) plasmas with zero net torque from neutral beam injection (NBI) for the full discharge duration. Wide pedestal QH-mode has many of the features of the previously investigated QH-mode while having the advantage of increased edge pedestal pressure and energy confinement time. Both QH-mode variants operate without edge localized modes. Accordingly, these discharges demonstrate that significant input torque is not essential to the exploitation of wide pedestal QH-mode in future devices that are expected to have small or non-existent NBI torque. Developing operating conditions that allowed net zero torque access to wide pedestal QH-mode required implementing several techniques to avoid locked modes including minimizing intrinsic error fields, avoiding large sawteeth, and driving toroidal rotation via neoclassical toroidal viscosity.

中文翻译：

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零净中性梁扭矩的宽基座静态 H 模式的产生和维持

最近在 DIII-D 上的实验表明，可以在整个放电持续时间内产生和维持宽基座静态 H 模式（QH 模式）等离子体，其中中性束注入 (NBI) 的净扭矩为零。宽基座 QH 模式具有先前研究的 QH 模式的许多特征，同时具有增加边缘基座压力和能量限制时间的优势。两种 QH 模式变体都在没有边缘局部模式的情况下运行。因此，这些放电表明，在预计具有小或不存在 NBI 扭矩的未来设备中，显着的输入扭矩对于开发宽基座 QH 模式并不是必不可少的。